The Amp Garage

Grounding as follows: B+1 ground to chassis near rectifier/bias board with HV center tap, and rectifier/bias. B+2 & 2b to chassis near power tubes. B+ 3, 3a, 3b, 4 and 5 (on filter board these are all tied together) to chassis near input jack with CL, OD, FX and PI grounds. Input and FX jacks isolat...

I put in some JJ KT66 power tubes I have to see what it would do for the heater voltage. They brought it down to 6.9vac. They sound great in this amp. Good highs. Brite. I see how they could cause the Ice Pick effect but luckily it's not bad in this amp and can be dialed down. The lows are nice and ...

Do not hesitate to message me if interested. I didn't hesitate but no response yet.... Ian I found Fran on a Marshall Forum Ad . I'm in the early stages of my first transaction with him but on that forum he has typically replied within an hour, typically less. To all, check out the thread I posted ...

Voltages:
B+ 450; B+2 448
PTs: 33.5/37.8 & 32.3/37.7mA
~17 watts/56%
Sovtek 6L6WXT+

B+3 430
PI 286/29

B+3a 387
FX2 251
B+3b 383
FX1 383/103 (Cathode Follower)

B+4 317
OD1 192
OD2 201

B+5 310
CL1 190
CL2 193

Heaters 7.0vac (a bit high)
Input 123 vac

Very interesting build Glenn! Impressive figuring it all out like you did. Way above my cranium, lol. Thank you Raoul. It's been a challenge for sure, but one I've enjoyed. I've enjoyed watching your builds, please keep posting them. Great looking build Glenn Thank you Tim. I haven't spent any time...

What do you mean 'original schematic'? I'm trying to correct it except I don't know where the problems are, hence the thread The schematic in your vey first post. It has numerous errors that were pointed out. The next iteration you posted still has several errors in the original sections, but you h...

Your last update made my head hurt. I suggest going back to your original schematic and get it corrected prior to adding mods. What do you mean 'original schematic'? I'm trying to correct it except I don't know where the problems are, hence the thread The schematic in your vey first post. It has nu...

Your last update made my head hurt.

I suggest going back to your original schematic and get it corrected prior to adding mods.

The main input and FX input jacks will not work as drawn.

How do you intend to bias the power tubes?

Phil, I agree people should use whatever works best for them. T Nuts work well for me. As you said pine is a good wood to use them in and that is what I have used so far. On my head cabinets I install wood slide rails to facilitate installing the amp chassis into the cabinet. If I used standard nuts...

A T-Nut is a type of insert or blind nut that fits from the other side from the screw like a standard nut. But it is permanent mount and nearly flush to the surface.

YW

I was mistaken, those are #8 screws, not #10.

Good looking all in one board! Looks like you're off to a good start. What brand of resistors are you using? I think you soldered the hole where the wiper of the PI balance pot goes a bit prematurely. Thought I'd point it out before you do the same elsewhere on the board. I'm certainly interested, k...

Another thing you might want to consider is capacitor orientation when you get the 6PS caps.

Capacitor outside foil placement
Cap tester

The shielded cable to V1A and V2B should only have the shield tied to ground at one end. If both ends of shield are tied to ground it can cause a ground loop. I can only see the tube end of these so don't know if other end is tied to ground but thought I'd mention it.