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Trinity Amps OSD Builder's Manual

Overdrive special design
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OSD
Overdrive Special Design
Builders Guide
For the sole personal use of Trinity Amps Customers.
February 2019, Version 1.25
Parts © Trinity Amps 2005 - 2020
www.trinityamps.com
Trinity Amps OSD Builders Guide Ver. 1.25.docx
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  • Page 1 Overdrive Special Design Builders Guide For the sole personal use of Trinity Amps Customers. February 2019, Version 1.25 Parts © Trinity Amps 2005 - 2020 www.trinityamps.com Trinity Amps OSD Builders Guide Ver. 1.25.docx - 1 -...
  • Page 2 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 2 -...

  • Page 3: Table Of Contents

    If you find any inconsistencies, or have any concerns, please let us know. Do not hesitate to contact us! We want this build to be successful for you and for Trinity Amps! We’re confident that you will like our product and our support and when you’re completed, we’d appreciate your comments posted on any of the internet forums such as thegearpage.net...
  • Page 4 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 4 -...

  • Page 5: Table Of Contents

    11 Connect Eyelet Board Ground Points ............................66 12 Connecting the Eyelet Board to Tube Sockets ........................... 67 13 Connecting the Eyelet Board to the Controls ..........................72 Shielded Cable ....................................72 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 5 -...
  • Page 6 Tone Tweaking ..................................... 106 General Tips for fine tuning your amp ............................106 Appendix 1 - Running 6L6 Tubes in the OSD ..........................108 Calculating Power Tube Bias ................................ 108 Appendix 2 - Installing the Buffered Effects Loop ........................109 Appendix 3 - How to read Resistor Color Codes ..........................

  • Page 7: Introduction

    Introduction This guide has been prepared for builders of Trinity Amps Kits. It is always being improved and we would appreciate your feedback and comments to: stephen@trinityamps.com Accordingly, content and specifications are subject to change without notice. We do try to make it as accurate as possible, but it is sometimes hard to keep up with the changes.

  • Page 8: Warning

    LIABILITY FOR INJURY OR PROPERTY DAMAGE RESULTING FROM THIS INFORMATION! ALL INFORMATION IS PROVIDED 'AS-IS' AND WITHOUT WARRANTY OF ANY KIND. REMEMBER: NEVER OPERATE YOUR AMP WITHOUT A LOAD. YOU WILL RUIN YOUR OUTPUT TRANSFORMER! Trinity Amps OSD Builders Guide Ver. 1.25.docx - 8 -...

  • Page 9: Version Control

    Updated OD RELAY connections to eyelet board (R. Vaivads) 1.21 15Feb19 Updated all relay drawings in manual 1.22 19Feb19 Updated OSD COM Relay connections thru manual 1.23 10Mar Update 240V connection text. Corrected PI Components text; added 1 stand-off to BOM (V. Sundberg) 1.24...
  • Page 10 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 10 -...

  • Page 11: About The Osd

    ODS’ easily selling for over $100,000 USD these days online they are not your average basement rockers amp. The Trinity Amps OSD is modelled after the 100W Dumble ODS #124 with just a few less frills. It boasts a nominal 24W output in a compact format of only 15-1/2 in W X 7-1/2”...

  • Page 12: Guitar Amplifier Basics

    Quite simply, if players prefer the sound of tubes, they will continue to buy and use them. Below are some fundamentals. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 12 -...
  • Page 13 There's no negative feedback in the power amp either, so this gives a different sound, often described as a sweeter overdrive. Listen to Brian May's sounds for plenty of good examples. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 13 -...
  • Page 14 Likewise, an assumption should be made that the output stage will at times be inadvertently shorted, so most professional equipment is designed to handle this contingency, preferably electronically, and at the very least without fuses inside the chassis. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 14 -...

  • Page 15: Dumble Tone Stack - From Merlin

    Mid pot simply decides how much mid actually gets fed to the Bass pot. Also, the more you turn up the bass, the less you can cut the treble, because the two pots are stacked. Here it is in jazz mode: Trinity Amps OSD Builders Guide Ver. 1.25.docx - 15 -...
  • Page 16 What about the .001uF cap across the bass pot and the 10K to ground on the CCW? The 1nF cap scoops the mids a tiny bit. The 10K resistor just sets the limit of the bass pot. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 16 -...

  • Page 17: General Amplifier Operation

    Overdrive the stuffing out of it. Tubes are very forgiving of massive overdrives, unlike solid state gear. As long as they tubes don't overheat for long periods, it's not fatal. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 17 -...

  • Page 18: Introduction To Vacuum Tubes And Common Terms

    It is usually a small value (i.e. .001uF) and it rolls off highs in the stage. Sometimes you see a high frequency roll off cap going from the plate pin to the cathode pin - 350pf->500pf in value. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 18 -...
  • Page 19 The Grid Stopper Resistor works best when mounted directly or as close as possible to the grid pin. "Complete" typical tube preamp stage: Trinity Amps OSD Builders Guide Ver. 1.25.docx - 19 -...
  • Page 20 The plate receives the voltage from the power supply through a plate resistor, the grid receives the AC signal as input and the cathode is grounded through a cathode resistor. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 20 -...

  • Page 21: Building An Amp

    Run one wire to the star ground point from each collection. (3) Run exactly one wire from the star ground point to chassis. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 21 -...

  • Page 22: Insulated Jacks

    The traditional method of constructing amps involved mounting the components on tag board or fiberboard. This is the technique that is used for Trinity Amplifiers and is the recommended approach for service and reliability. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 22 -...

  • Page 23: Assembling The Amp

    5. Make a good mechanical connection first, and then make a good solder joint. 6. Heat the leads to be soldered by touching it with the tip of the iron. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 23 -...

  • Page 24: Tube Pin Numbering

    12AX7 12AT7 The pins on the potentiometers are numbered 1 to 3 from left to right when the shaft is facing towards you and the pins are at the top. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 24 -...

  • Page 25: Check Your Kit

    18. Double check that all the connections are made according to the layout and it is neat and tidy. 19. Build the footswitch box, cable and DIN connector. 20. Plug in the foot switch, and follow the start-up procedure. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 25 -...

  • Page 26: Install All The Hardware

    Expose just enough to fit the round “dress nut”. Slide the “washer” onto the threaded portion and press it into the gap. Put on the “dress nut” and finger tighten. Tighten the “hex nut” inside, until securely in place. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 26 -...
  • Page 27 8-32 lock nuts 8 “KEPS” for power transformer; 1 KEP nut for ground bolt. 10-32 X 1-½ Mount chassis to cabinet. Use cage nuts in square holes pressed into chassis. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 27 -...
  • Page 28 #10 (4) with cage 6-32 4-40 #8-32 GROUND BOLT 4-40 (2) Trinity Amps OSD Builders Guide Ver. 1.25.docx - 28 -...
  • Page 29 In building the amp, you may want to remove some parts to build these sub-assemblies. For example the Input Jack, Volume control. Be prepared to remove these parts to build these sub-assemblies. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 29 -...

  • Page 30: Install Terminal Strips

    4-40 KEPS NUT V1 requires a 2 lug 2 4-40 KEPS NUT common installed on the outside screw. 2 LUG 2 COMM Trinity Amps OSD Builders Guide Ver. 1.25.docx - 30 -...
  • Page 31 V4 requires a 2 lug 2 2 LUG 2 COMM common terminal strip plus a chassis lug installed on the inside (closest to eyelet board) 4-40 KEPS NUT screw. #6 CHASSIS LUG Trinity Amps OSD Builders Guide Ver. 1.25.docx - 31 -...
  • Page 32 2 LUG 2 COMM common terminal strip installed on the inside (closest to eyelet board) 4-40 KEPS NUT screw. On the opposite side, a chassis lug is #6 CHASSIS LUG required. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 32 -...
  • Page 33 Your chassis should look like this. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 33 -...
  • Page 34 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 34 -...

  • Page 35: Install Terminal Strip Components

    Form and install the .047uf to the fourth lug (4) and lug 1 on the adjacent terminal strip. Form and install another 22M from lug 1 to pin 6. Solder lug 4, lug 1 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 35 -...
  • Page 36 On the first lug (1) , form and install the 470R to pin 4 Solder at the lug and pin 4. Form a 5K1 to fit between pins 5-6. Solder the resistor to the pins. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 36 -...
  • Page 37 On the first lug (1) , form and install the 470R to pin 4 Solder at the lug and pin 4. Form a 5K1 to fit between pins 5-6. Solder the resistor to the pins. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 37 -...

  • Page 38: Install Components On The Send Return Jacks And Bias Points

    (outside) Test Point jack terminal to pins 8 and 1 of socket 4 & 5. Solder in place Connect a 10K 1W resistor from the ground lug attached to socket 4, to the right-most terminal of the 10K BIAS-TRIM POT. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 38 -...

  • Page 39: Install The Ground Bus

    • Complete the assembly by connecting a GREEN lead the bus bar close to the VOLUME control and connected to the PRE Ground lug. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 39 -...

  • Page 40: Connect Components To The Ground Bus

    1 - .0047uf / 4700pf capacitor (could be a 4700pf ceramic disc or .0047uf orange drop) 1 - 100K resistor 1 – 22M resistor 1/16” dia. heat-shrink tubing or PVC cut-offs from 22ga wire Trinity Amps OSD Builders Guide Ver. 1.25.docx - 40 -...
  • Page 41 Connect a jumper between terminal 3 and 6 of the Mid Boost DPDT switch. Solder both ends in place. Connect a jumper from lug 3 of the treble control to terminal 2 of the Mid Boost DPDT switch. Solder both ends in place. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 41 -...
  • Page 42 4. . Tack Solder in place. Form a solid wire from the 1M lug to the bus bar and through to the adjacent jack lug. Solder everything in place . Trinity Amps OSD Builders Guide Ver. 1.25.docx - 42 -...
  • Page 43 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 43 -...

  • Page 44: Build The Relay Board

    'k' or '-' for cathode (yes, it really is 'k', not 'c', for cathode!). The cathode is marked by a line painted on the body of the diode. Diodes are labeled with their code in small print, and you may need a magnifying glass to read! Trinity Amps OSD Builders Guide Ver. 1.25.docx - 44 -...
  • Page 45 RELAY BOARD – POPULATED There are some additional Overdrive components to add to the board. Add two RED 24 Gauge solid wire jumpers and a 22M resistor. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 45 -...
  • Page 46 Use #6 lock washers under the screw head. NOTE: In the next step, once the power transformer is installed, you can connect the 2 - 5VAC leads to the RELAY board and test it. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 46 -...

  • Page 47: Install The Power Transformer And Output Transformer

    ½” grommet. Bolt the transformer in place with the supplied 8-32 bolts & Keps nuts. The secondary leads should be approximately in-line with the impedance switch in the rear of the chassis. Wire the Output Transformer Trinity Amps OSD OUTPUT TRANSFORMER HTS-8815-2 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 47 -...
  • Page 48 Refer to the Output Transformer schematic above and the below. The OSD is set up to switch impedances to match 6V6 and 6L6 power tubes and as such, has a dual primary consisting of together (Brown – RED – BLUE – Brown/White – BLUE/White leads. 6V6 - 8K primaries are Brown and BLUE while 6L - 6K primaries are Brown-White and BLUE-White.

  • Page 49: Wire The Impedance Selector And Output Jacks

    Strip enough wire to bridge between both jacks. Check your speaker jack with and without a speaker plugged in to make sure it isn't shorted. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 49 -...

  • Page 50: Wiring The Power Transformer Primary Leads

    The 5V YELLOW, 325V HV and RED/BLUE 45V BIAS tap are now all that are left unconnected. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 50 -...

  • Page 51: Mains

    The 5V YELLOW, 325V HV and RED/BLUE 45V BIAS tap are now all that are left unconnected Trinity Amps OSD Builders Guide Ver. 1.25.docx - 51 -...

  • Page 52: Test The Power Transformer

    5V YELLOW leads, and making sure they do not touch each other, turn the power on and measure the voltage with an AC voltmeter. You should measure 5VAC or more between the 2 leads. If so, turn the power off and tape the YELLOW leads up. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 52 -...
  • Page 53 HV secondary, record the Mains and AC secondary voltages to ensure they are within spec of the transformer schematics and specs. The voltages below are under LOAD. Trinity Amps OSD Power Transformer PT650 EX HTS-8816EX Trinity Amps OSD Builders Guide Ver. 1.25.docx...

  • Page 54: Test The Overdrive Relay Board

    LED Cathode to the ground bus to test. When applied, the LED should illuminate as you energize each coil. TIP: If you build the Footswitch now, you can also test the RELAY board using the footswitch. Testing OD REL2 on the RELAY Board Trinity Amps OSD Builders Guide Ver. 1.25.docx - 54 -...

  • Page 55: Build The Eyelet Board. Install It In The Chassis

    10 Build the Eyelet Board. Install it in the Chassis If you do not have a pre-built Trinity Amps OSD Eyelet board, now is the time to build it. Some builders like to install jumpers under the board and some on top of the boards. Installing them on top facilitates servicing and testing while installing them on the bottom looks neater but servicing is harder to do.
  • Page 56 The colour of the wire does not matter. Make sure the jumper does not cover up another eyelet, hole or mounting hole. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 56 -...

  • Page 57: Eyelet Board General Assembly Notes

    Diodes are labeled with their code in small print, and you may need a magnifying glass to read! The diagram below shows the orientation of the 1N4007 diode. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 57 -...
  • Page 58 • Repeat for all the components that are intended to fit into each eyelet. • Solder in place and fill the eyelet with solder, as above. • Inspect the connection Trinity Amps OSD Builders Guide Ver. 1.25.docx - 58 -...

  • Page 59: Eyelet Board Assembly

    Familiarize yourself with the axial capacitor and note the POSITIVE end. Using the Component Installation Process, install the: 470R and 1N4007 diode 100uF capacitor (positive end to ground!!); and 5 - 1N4007 diodes Inspect the connections Trinity Amps OSD Builders Guide Ver. 1.25.docx - 59 -...
  • Page 60 Tip: Sometimes it is a good idea to first solder at the eyelet that has no other part inserted in it. This is in order to keep the component located correctly on the eyelet board while the required components are installed. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 60 -...
  • Page 61 Inspect the 1uf tantalum capacitor and locate the POSITIVE lead. Install it onto the board according to the layout diagram. and picture +’ve beside. side goes away from the GROUND eyelet and 390R resistor. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 61 -...
  • Page 62 Process, install the: 2 – 1K5 resistor / 4.7uF capacitor pairs Next install the 2 – 100K 1% resistors, .0047uF and, .01uF capacitors and the 100K and150K resistors. Finally install the 220K resistor Inspect the connections Trinity Amps OSD Builders Guide Ver. 1.25.docx - 62 -...
  • Page 63 Next install the .047uF, 2 – 100K and 150K 1% resistors, .002uF, 0.1uF and .01uF orange drop capacitors. Inspect the connections With the board now fully populated, inspect it again for accuracy and proper connections. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 63 -...
  • Page 64 Align the screw with the #6 tapped holes in the chassis and install the board. Loosely tighten the screws. Repeat at other end and middle and then tighten nuts firmly. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 64 -...
  • Page 65 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 65 -...

  • Page 66: Connect Eyelet Board Ground Points

    The solder is smooth and shiny, and fillets the entire wire/lead and terminal interface. Using GREEN Solid wire, route and connect three board ground points to Trinity Amps OSD Builders Guide Ver. 1.25.docx - 66 -...

  • Page 67: Connecting The Eyelet Board To Tube Sockets

    Once the connection is cool, press the wire so that it lies flat on the board and chassis with any excess tucked underneath the board. Repeat for each eyelet that has a connection to another part. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 67 -...
  • Page 68 Connect the previously wired orange under-board lead from the .047uF capacitor to pin 6, socket 1. Connect the other 25uF / 1K5 pair with the previously wired BLUE under-board lead to pin 8 socket 1. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 68 -...
  • Page 69 68K grid resistor that connects to pin 2 socket 2. Connect lug 1 of the trim pot with a GREEN wire to the ground lug of the RETURN jack. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 69 -...
  • Page 70 Connect the previously wired orange under-board lead from the 0.1uF capacitor/110K resistor to pin 6 socket 3. Connect the 0.1uF capacitor /1M resistor eyelet with an YELLOW lead to pin 7, socket 3. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 70 -...
  • Page 71 B+ 2 to each of 470R 5W resistor on the terminal strips. Connect them to the board eyelet. Route neatly, trim to length and solder the leads to each 470R 5W resistor on the terminal strips. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 71 -...

  • Page 72: Connecting The Eyelet Board To The Controls

    5. Finally, cut back the outside plastic covering on the “core” on the inside conductor at both ends by about 1/4" 6. Lightly tin the 2 core wire ends and the shield. NOTE: Do not overheat and melt the inner core Trinity Amps OSD Builders Guide Ver. 1.25.docx - 72 -...
  • Page 73 RELAY board and eyelet board and solder in place on the eyelet board 1uf Tantalum eyelet and control. Route the PRESENCE CONTROL pin 3 lead along the chassis, inbetween the RELAY board and eyelet Trinity Amps OSD Builders Guide Ver. 1.25.docx - 73 -...
  • Page 74 Measure and cut a lead to go neatly from the 220K resistor eyelet on the board to the OD RELAY COM terminal on the RELAY board. Solder in place on the RELAY and EYLET BOARD. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 74 -...
  • Page 75 Fx is plugged in. If you want it to be connected when the Fx is inserted, connect the return cable to the switch lug (middle) of the SEND jack. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 75 -...
  • Page 76 Route a COAX CABLE from the LEVEL CONTROL terminal 2 along the chassis, inbetween the RELAY board and eyelet board, then underneath the eyelet board durectly to the the terminal strip Trinity Amps OSD Builders Guide Ver. 1.25.docx - 76 -...
  • Page 77 Route the lead from the BASS control terminal 2 along the chassis, inbetween the RELAY board and front panel and solder in place on the RELAY board, PAB relay, COM terminal and control. RELAY BOARD (PAB) Trinity Amps OSD Builders Guide Ver. 1.25.docx - 77 -...
  • Page 78 Solder in place at both ends. Route the lead from the TREBLE control terminal 3 neatly and tightly along the chassis edge to the MID-BOOST Switch terminal 2. Solder in place at both ends. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 78 -...
  • Page 79 The Tip connection is at the very end of the plug and is normally ‘positive’ polarity. This is sometimes referred to as the ‘Hot’ side. The other part of the plug is typically ground or ‘common’ Trinity Amps OSD Builders Guide Ver. 1.25.docx - 79 -...

  • Page 80: Wire The Relay Board To The Foot Switch Chassis Socket

    Using 26 gauge wire, measure and cut 4 wires from the RELAY board to the FOOTSWITCH SOCKET by running the wire in the chassis corner. SOLDER 4 leads to the RELAY board for +5V, Ground (GND), OD and PAB. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 80 -...
  • Page 81 FOOTSWITCH SOCKET as shown in the layout. IMPORTANT: Make a careful note which lead is which Trinity Amps OSD Builders Guide Ver. 1.25.docx - 81 -...

  • Page 82: Complete The Power Transformer Secondary Wiring

    RECTIFIER DIODE eyelets and solder them in place. Twist and route the BLUE/ RED 45VAC BIAS tap leads to the 470R voltage dropping resistor eyelet. and solder it in place. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 82 -...
  • Page 83 Solder in place at the eyelet and switch. Measure and cut a RED 600V HV lead from the other STANDBY switch lug to the HV 500mA fuse holder, end lug. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 83 -...
  • Page 84 There should already be a wire from the BIAS control to the 220K/220K eyelet on the board. This completes the power transformer secondary wiring. NOW DOUBLE CHECK YOUR WORK. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 84 -...

  • Page 85: Complete Output Transformer Wiring

    HV Centre Tap lead to the B+1 node on the eyelet board and connect the NEGATIVE FEEDBACK (NFB) resistor to the impedance switch. Route the RED HV lead to the 500R/100uF filter cap eyelet. And solder it on the board. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 85 -...
  • Page 86 Run a wire from the 4 OHM tap for the NEGATIVE FEEDBACK (NFB) to the eyelet board 4K7 2W Trinity Amps OSD Builders Guide Ver. 1.25.docx - 86 -...

  • Page 87: Wire The Heaters

    V2, pin 9 and the BLACK lead onto pins 4 AND 5 together.. Solder V2 pins. Hook the other end RED lead onto V1, pin 9 and the BLACK lead onto pins 4 AND 5 together.. Neatly align all the heater wires. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 87 -...
  • Page 88 NOTE. If you are installing the Buffered Effects loop, the Heater connections between V2 andV3 will need to be wired to lie down tight to the chassis to provide clearance for the FX PCB. TOP VIEW SIDE VIEW Trinity Amps OSD Builders Guide Ver. 1.25.docx - 88 -...

  • Page 89: Double Check

    Put your probe on the parts lead. All readings should be between 1 ohm and 0.1 ohm typically. 6. Make sure the Mains ground at the chassis is very tight. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 89 -...

  • Page 90: Build The Footswitch Box, Cable And Din Connector

    OD switch, the OD LED on the RELAY board should illuminate. Same for PAB and for BOTH when pressed. If this does not work as expected, then review and correct the installation errors. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 90 -...

  • Page 91: Start-Up Procedure

    NOTE: On first power-up, we recommend you make and use a bulb limiter (or variac if you have one). It will keep you from destroying some very expensive parts if there is any problem with your amp. Typically use a 40W to start with. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 91 -...
  • Page 92 Leave the amp on for a few minutes and make sure neither tranny is getting warm. The OT should stay dead cold and the PT should get just a little warm supplying the pilot lamp Trinity Amps OSD Builders Guide Ver. 1.25.docx - 92 -...
  • Page 93 16 Check plate voltages at V1 and V2. V1a will be about 212VDC, V1b will be about 209VDC, V2a about 216VDC, and V2b about 219VDC. Cathode voltages will be in the 1.7VDC range. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 93 -...

  • Page 94: Quick Osd Setup

    1. Plug your guitar using a 1/4” instrument cable into the INPUT on the far left of the front panel 2. Plug a suitable power cable from the OSD’s rear panel MAINS cable inlet to your wall power receptacle 3. Plug the OSD into your speaker cabinet using 1/4” speaker cable 4.

  • Page 95: Using The Osd Controls

    10:00 and 12:00 but experiment for your own tone. FOOT SWITCH 5-pin DIN female jack is used to connect the foot switch to the amplifier. Use the foot pedal to control the OVERDRIVE and (PAB) PREAMP BOOST modes. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 95 -...

  • Page 96: Trinity Amps Osd Osd 6V6 Voltage Chart

    Trinity Amps OSD OSD 6V6 Voltage Chart AC Mains Voltage 120VAC;B+ 460 VDC no tubes; With Tubes: B+1 441 VDC; B+2 440 VDC; B+3 434 VDC: B+4 333 VDC: B+5 320 VDC 6V6 Bias 22 ma @ -41VDC Bias Voltage...

  • Page 97: Trinity Amps Osd 6L6 Voltage Chart

    Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 V1 - PRE (12AX7/ECC83) V2 - OD (12AX7/ECC83) V3- PI (12AX7/ECC83) V4 6L6 V5 6L6 * Varies with bias pot setting Trinity Amps OSD Builders Guide Ver. 1.25.docx - 97 -...

  • Page 98: Warning

    USE AT YOUR OWN RISK TRINITY AMPS INC. EXPRESSLY DISCLAIMS ALL LIABILITY FOR INJURY OR PROPERTY DAMAGE RESULTING FROM THIS INFORMATION! ALL INFORMATION IS PROVIDED 'AS-IS' AND WITHOUT WARRANTY OF ANY KIND. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 98 -...

  • Page 99: Troubleshooting

    A faulty, humming preamp tube can be isolated this way very quickly. Conversely, if the volume control does not affect the hum, the cause is somewhere after the volume control. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 99 -...

  • Page 100: Faulty Tube

    =1uF/500V, triangle ∆=20uF 500V, etc. and then clip the old terminal with the symbol off the old can. Remove the old Trinity Amps OSD Builders Guide Ver. 1.25.docx - 100 -...

  • Page 101: Faulty Bias Supply In Fixed Bias Amplifiers

    Suspect this if the hum changes loudness or tone when you move or turn the amp. There is usually nothing you can do about this except move the amp to where the hum is less. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 101 -...

  • Page 102: Poor Internal Wire Routing

    Hiss Some noise or hiss is normal if you have used carbon composition resistors. OSD kits are supplied with Carbon Film and Metal film resistors similar to the original. This style of resistor has inherent noise.

  • Page 103: Squealing/Feedback

    If you get a buzz in an amp when it’s installed in a cabinet, it could be due to any one or a combination of the following things. Start with the easy things and work your way through the tests. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 103 -...
  • Page 104 & chassis. Flush mounting (i.e. no washers) could cause rattle. Use rubber gasket between transformer or use washers • Is the Circuit board mounted tightly against chassis? Tighten mounting screws - check standoffs. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 104 -...
  • Page 105 Make sure all the components are away from the board and not touching, and put neoprene 3/8’ X 1/8’ window sealer with one adhesive side, between chassis and wherever it touches the cabinet. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 105 -...

  • Page 106: Tone Tweaking

    - now you can turn the pot and dial in the perfect tone. After dialing the sound, remove the resistor and pot and measure it. Substitute the nearest standard value resistor in place of the pot plus a resistor. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 106 -...
  • Page 107 Add high frequency roll off caps in parallel with the plate resistor. This is sometimes used • to "mellow" out a stage (reduces highs). Adjust the grid leak resistor. Reduce the value to attenuate the signal into the stage to • control the gain. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 107 -...

  • Page 108: Appendix 1 - Running 6L6 Tubes In The Osd

    Ohm resistor placed between the probe jacks and ground to convert a current reading to a voltage reading across the resistor. That way, a bias current of 24mA measures as 24mV on your DMM. NOTE – Only set your DMM to mV for measuring bias on the OSD amplifiers. Not doing so may damage your DMM.

  • Page 109: Appendix 2 - Installing The Buffered Effects Loop

    If this is the case, changing the B+4 stage 22K 2W dropping resistor to a lower value will allow the B+4 to return close to its original value. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 109 -...
  • Page 110 3. Inject a signal into the amp and flip the BYPASS switch ON and then OFF. 4. Adjust the RETURN trimmer so that the levels with BYPASS ON and OFF are the same. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 110 -...
  • Page 111 Fx BOARD INSTALLATION LAYOUT Trinity Amps OSD Builders Guide Ver. 1.25.docx - 111 -...

  • Page 112: Appendix 3 - How To Read Resistor Color Codes

    1% resistors have three bands to read digits to the left of the multiplier. They have a different temperature coefficient in order to provide the 1% tolerance. At 1%, most error is in the temperature coefficient - i.e. 20ppm. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 112 -...

  • Page 113: Appendix 4 - How To Read Capacitor Codes

    Most kit builders don't need to go further but there is sometimes a tolerance code given by a single letter. So a 102K is a 1,000 pF with +/-10% tolerance Trinity Amps OSD Builders Guide Ver. 1.25.docx - 113 -...
  • Page 114 .005 10000 12000 .012 20000 22000 .022 47000 .047 100000 680000 Table 2 Letter tolerance code Letter symbol Tolerance of capacitor 0.10% 0.25% 0.5% 0.5% 0.05% P +100% Z +80% Trinity Amps OSD Builders Guide Ver. 1.25.docx - 114 -...

  • Page 115: Appendix 5 - Faq

    DC output and the first filter cap. On an OSD, it is measured between the joined lugs of the 100 and 50 cap and chassis ground. It should be about 440 VDC with tubes, with 120 VAC mains.
  • Page 116 TIP: Use insulation tubes from the wiring on the resistor / cap leads around the tubes and pots by using longer pieces of insulation stripped from the supplied 20 ga wire. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 116 -...

  • Page 117: Appendix 6 - Cliff Jacks Explained

    You should get continuity between the tip and chassis with nothing plugged in because of the shorting jack and the cross over wire. From 18W Forum – loverocker & ebe Trinity Amps OSD Builders Guide Ver. 1.25.docx - 117 -...

  • Page 118: Appendix 7 - Additional Mains Wiring Schematics

    BLACK/RED 120V GREEN 3.15 V WHITE 0V GREEN /YELLOW 0V 220V LINE WHITE/BLACK 110V GREEN 3.15 V YELLOW 0 V YELLOW 5 V WHITE/RED 120V OSD POWER TRANSFORMER 220V HOOK-UP Trinity Amps OSD Builders Guide Ver. 1.25.docx - 118 -...
  • Page 119 BLACK/RED 120V GREEN 3.15 V WHITE 0V GREEN /YELLOW 0V WHITE/BLACK 110V GREEN 3.15 V YELLOW 0 V YELLOW 5 V 240V LINE WHITE/RED 120V OSD POWER TRANSFORMER 240V HOOK-UP Trinity Amps OSD Builders Guide Ver. 1.25.docx - 119 -...

  • Page 120: Appendix 8- Osd Bill Of Materials

    OSD CAPACITORS CERAMIC DISC CAPACITORS .25LS 15PF 1KV 10% CERAMIC DISC CAPACITORS .25LS 270PF 1KV 10% CERAMIC DISC CAPACITORS .25LS 300PF 1KV 10% CERAMIC DISC CAPACITORS .25LS 500PF 1KV 10% Trinity Amps OSD Builders Guide Ver. 1.25.docx - 120 -...
  • Page 121 RECEPTACLE - AC WITH 5X20MM FUSE HOLDER CARTRIDGE FUSES CARTRIDGE FUSES 250V .5A SLO-BLO 3AG FUSE - SLOW-BLOW 250V MINIATURE 5MM X 20MM 2 AMPS FUSE HOLDER - SCREW TYPE 3AG-TYPE Trinity Amps OSD Builders Guide Ver. 1.25.docx - 121 -...
  • Page 122 22 GUAGE STRANDED TINNED COPPER WIRE 600 VOLT PVC RED 18 GUAGE STRANDED WIRE BLACK 18 GUAGE STRANDED WIRE WHITE BELDEN RG174/U COAXIAL CABLE HEAT SHRINK TUBING 1MM HEAT SHRINK TUBING 3MM HEAT SHRINK TUBING 6MM Trinity Amps OSD Builders Guide Ver. 1.25.docx - 122 -...
  • Page 123 CORD - POWER 18 AWG 3 CONDUCTOR DETACHABLE BLACK IEC LENGTH: 8 FEET OSD EYELET BOARD COPPER 18 GA SOLID BUS BAR ALUMINUM TAPE CHASSIS OSD ALUM FOOTSWITCH - FOR MARSHALL TWO BUTTON LED TRANSFORMER PT-650EX OSD TRANSFORMER OT OSD Trinity Amps OSD Builders Guide Ver. 1.25.docx - 123 -...

  • Page 124: Addendum - Footswitch - Relay Board Connection

    When applied, the LED should illuminate as you energize each coil. TIP: If you build the Footswitch now, you can also test the RELAY board using the footswitch. Trinity Amps OSD Builders Guide Ver. 1.25.docx - 124 -...
  • Page 125 Trinity Amps OSD Builders Guide Ver. 1.25.docx - 125 -...

  • Page 126: Trinity Amps Schematics And Layouts

    Trinity Amps Schematics and Layouts Trinity Amps OSD Builders Guide Ver. 1.25.docx - 126 -...

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