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Hey Mikey, what are the pickups in that guitar??

OK, I can't help myself. I had a Traynor Bassmaster (YBA-1) which is a clone of the '59 Bassman/JTM 45 and it was a glorious (but HEAVY) amp. So I've decided to sketch out a preliminary layout for a pedal version. I reviewed the original schematic, but also found this paired down layout from...

Will this unit power two 12AX7's? BTW, don't forget the cad file for the PA drill template. Thx.

I still come back to my love of the 5F6 Bassman so I applied my layman's eyes to the schematic diff's btw the 5F6 and Particle Accelerator (a blackface circuit). Seems most values are identical to the PA (tone stack has some variances depending on the schematic you look at) so the primary diff...

Just to prove I've REALLY got nothing better to do, here's one using standard solder lug 16mm pots. The 9mm come in fewer flavors so if you need a more flexibility in values 16mm appears to be the way to go. While not as "elegant" as having 9mm that solder to the PCB you also have more...

I slapped this together last night. It's just an expansion of the PA PCB to inhabit a 1590BB enclosure. It has 6 sockets for 9mm pots and 7 "terminal strips" w/ extra eyelets provided for jumpers as required. The terminal strips are wide enough to accommodate larger Mallory 150's. The lower...

I'll toss this out for consideration and comment. I built an AB763 preamp pedal while waiting for the Particle Accelerator to hatch. Nathan helped me out immensely with it. I built it on a standard terminal strip board and adhered the pots to the back of the circuit board w/ industrial...

I came across this the other day. . . . A little extra money, but no counterfit chips, crappy or marginally sized components. You can find Jerry's website here: https://www.jerryselectronics.com/

Nathan, did I understand you correctly that the 220K resistor just before the Master Vol is to pad the output somewhat for better use into SS amps/mixers, etc. desiring a line level signal input?

I know the DIY Space Heater is going the way of the Dodo Bird, but just the same if I wanted to put a bass trim in it would putting a smaller sized coupling cap on a toggle be a good way to go?

Oops, sorry. . . the Bass cap needs to be .22u and the Mid cap needs to be .0022u.

@vigilante398 says the Space Heater diy is being discontinued. I worked on a mod to convert the Particle Accelerator to a SH by bypassing the tone stack, but also toyed with Duncan Tone Stack Calc to make an equivalent that has a flat EQ curve like the SH, but allows some adjustment to the...

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I was thinking of strictly a tube preamp pedal like Sushi makes . . . no output stage. So there’s nothing to draw a feedback loop from. Just wondered if there was a way to mimic it in a “preamp only” format.

Don’t lie awake at night over it. Just curious about what’s going on. Next thing on my agenda is learning how to play the guitar 🤪

Even if they're both RED LED's? So even if the variance in forward voltage drop is minuscule the "squeaky wheel" will get the "grease"?

I still have a love of my old 5F6 Fender Bassman. If you were to build a preamp pedal how could you emulate the negative feedback loop?

I built a tube preamp that has a "standard" foot switch bypass and a second foot switch that toggles an additional component in the tone stack in/out. Both have LED indicators that are wired in parallel as shown and drawing current directly from the 9v DC jack. The LED cathodes are foot...

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To @kweefthief's experience. . . is the oscillation issue simply a "too much gain" issue given the circuit layout? I also find the SH has more gain on tap than I would typically need. If a 5751 or 12AY7 would tend to avoid the problem that would be great!