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Summary of Contents for TRIODE Dynaco ST70
- Page 1 Triode Electronics ST70 Kit INSRUCTION MANUAL Rev. 1 2007...
- Page 2 Step 1: Mount the power transformer into the chassis using 8-32locknut Step 2: Mount Rubber grommets for output transformer leads...
- Page 3 Step 3: Mount Rubber grommets for other output transformer and install C354 choke using 6-32 bolts and locknuts Step 4: Mount output transformers into chassis using 8-32 bolts and lock washers, run leads through grommet holes into chassis.
- Page 4 Step 5: Mount Octal sockets for EL34 tubes and 5AR4 tube into chassis using 4-40 bolts and nuts Step 6: Install 10k bias potentiometers into chassis...
- Page 5 Step 7: Install bias test points next to bias potentiometers Step 8: Install power switch into back panel of chassis...
- Page 6 Step 9: Install Gold Insulated RCA Jacks into the front panel of the chassis:...
- Page 7 Step 10: Build and Install the Driver PCB board into the chassis A. populate resistors onto board B. Populate Polystyrene Capacitors onto board...
- Page 8 C. Populate Coupling Capacitors and Screen Bypass Caps onto board D. Solder PC mount sockets onto the board E. Install Built driver board into chassis using 4-40 bolts and nuts...
- Page 9 Step 11: While we’re at it lets go ahead and put together the SDS Labs capacitor board so it will be ready for later A. Install Snap in Capacitors into the board and solder in place B. Install Resistors on top side of board...
- Page 10 C. Install Bias caps, Heater bypass caps, and bias supply diode D. Install surface mount resistors onto the bottom of the board...
- Page 11 Step 12: Let the wiring begin, lets first twist wires from the power transformer together. Twist the following wires together: the two green wires, the two brown wires, the two white wires, and the two red wires. Step 13: Now twist the wires from the output transformers: twist the blue and green wires together, twist blue/white and green/white wires together.
- Page 12 Step 14: Wire the twisted Red leads from the power transformer to pins 4 & 6 of the 5AR4 socket Step 15: Wire the twisted white leads from power transformer to pins 2 & 8 of the 5AR4 socket...
- Page 13 Step 17: Wire the Blue/White & Green/White wires of both output transformers to pins 3 & 4 of the EL34 sockets that are closest to the back of the chassis. Blue/White goes to pin 3 and Green/White to pin 4...
- Page 14 Step 18: Wire the Blue and Green wires from the output transformers to pins 3 & 4 of the other EL34 sockets that are closest to the front of the chassis. The blue wire connects to pin 3 and the Green wire connects to pin 4.
- Page 15 Step 19: Solder 1k grid stopper resistors onto all EL34 sockets. Resistors are installed between pins 5 & 6.
- Page 16 Step 20: Wire Eyelet #6 of the driver board to the center lug of the right bias pot (looking from bottom of amp). Also wire Eyelet # 2 to pin 6 of The EL34 with the blue/green wires going to it and Eyelet #1 to pin 6 of the EL34 with the Blue/White and Green/White wires going to it.
- Page 17 Step #21 Repeat this procedure for the other side of the amplifier, Connect eyelet #21 to center lug of left bias pot (looking from bottom of amp). Also connect eyelet # 23 to pin 6 of EL34 with the blue/green wires going to it and eyelet # 22 to pin 6 of the EL34 with the blue/white and green/white wires going to it.
- Page 18 Step 22: install solder lug onto 4-40 bolt/nut that holds on one of the EL34 sockets on each side. Take the 10ohm resistor and connect it to pins 1 & 8 of the EL34 socket to the solder lug. Then take a wire off either pin 1 or 8 and connect it to pins 1 &...
- Page 19 Step 23: Now we will begin wiring the SDS Labs capacitor board into the circuit A. Connect a wire from pin 8 of the 5AR4 socket to one of the eyelets on the cap board labeled Rcath/Ind1. Also wire one wire from the C354 choke to the same eyelets. B.
- Page 20 Note: on this picture one of the A470’s red wires is not connected to the board and the main ground wire is not yet attached.
- Page 21 Step 24: Connect a wire from the right terminal of the bias pot to the right terminal of the other bias pot, Connect a wire from the left terminal of the bias pot to the left terminal of the other bias pot. Step 25: Install the fuse holder and install binding posts on both sides of the amp...
- Page 22 Step 25: Take the twisted green wires and the twisted brown wires from the power transformer and connect them with a twist tie for cleanliness of wiring. The brown wires will go to pins 2 & 7 of the EL34 socket on the left side and the Green wires will go to pins 2 &...
- Page 23 Step 28: Connect two wires from pins 2 & 7 of the EL34’s with the green filament wires going to them (right side looking from bottom of amp) run these wires to eyelets #4 and #5 on the driver board. Before soldering to eyelets #4 and #5 also connect a second set of wire into the holes which we will connect to eyelets #24 and #25 on the driver board Step 29: Connect two wires from pins 2 &...
- Page 24 Step 30: Wire the Speaker taps from the A470 output transformers to the binding posts. Black is common and goes to the black binding posts. Brown is 4ohms and goes to one of the red binding posts. Orange is 8ohms and goes to the other red binding posts, Yellow is the 16ohm tap and is normally not hooked up unless you are using 16ohm speakers in which case you can omit the wiring of one of the other taps and use the 16ohm instead.
- Page 25 Step 31: Connect a wire from eyelet #11 on driver board to pin 4 of the EL34 on the right side (looking at amp from bottom) with the blue and green wires going to it. This will be the same pin the green wire is going to.
- Page 26 Step 28: Connect a solder lug to one of the mounting bolts for the PA060 power transformer. Connect the two wires from the black (common) binding posts, the red/yellow wire from the power transformer, the ground wire from the SDS Labs capacitor board, and a wire from eyelet #9 on the driver board all to the solder lug terminal.
- Page 27 Step 29: Connect the power cord. The white wire of the cord will go to the back lug of the fuse holder, the black wire of the cord will go to one lug of the power switch, and the green wire should be grounded at any convenient point on the chassis.
- Page 28 Step 31: Connect a wire from either pin 1 or 8 of the EL34 sockets on the right side to a bias test point, Connect a wire from either pin 1 or 8 of the EL34 sockets on the left side to the other bias test point. Step 32: Your are finished with the build, go take a break and come back in a few hours or the next day to check over all your wiring and do your last final checks before power up the amplifier for the first time.
- Page 29 Your finished amplifier should look something like this: Final Installation Instructions: A. Install the EL34’s and 5AR4 into the octal sockets on the top of the amplifier B. Install two EF86’s on the two outside sockets of the driver PCB board C.
- Page 30 Bias Instructions: Now get out your voltmeter and set it for a low DC volts range, must be at least 2VDC. Connect the black lead to the chassis at any point and connect the red lead to one of the bias test points. Switch your meter over to its ohms setting and you should read 10ohms, move the red lead to the other bias test point and you should read 10ohms here as well.
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