Recent content by GAStan

Out of curiosity, how do those pots mount to the enclosure?

Looking closer at this I see two (of possibly several) options: Option #1: This gives the widest range of volume control, possibly overdriving the PI (edit: and/or Power Tubes) at higher settings. Option #2 would be the top schematic. This retains R14 as R5 (top 470k) and replaces R15 with a...

I like your original suggestion of replacing R14 and R15 with a 1m pot. It changes the circuit very little and gives the volume control you desire. I would use an audio taper pot.

Here are several examples of Dumble amps with schematics in PDF format. Serial#s 102, 124, & 183 as well as the Steel String Singer (SSS) sticky threads would be good places to start. Consequently I have built four different 100 watt amps based on #s 102, 124, 183 and SSS 002, the SSS is my...

Since it hasn't been mentioned yet, SAFETY! Be aware of what you’re working on at all times, these voltages can kill you and at the very least hurt like hell if you touch the wrong thing (speaking from experience). On the bias probe, I agree with @JohnnyCreepy except I prefer to use 1r...

Better-yes Indestructible-no Heat sinks work BOTH ways.

^Guilty as charged^

I've never had an issue with this happening and I never pay attention to where the pot is turned to. That being said I have read about this on other forums, it could happen when soldering the wiper connection which could heat up enough to burn the resistive trace. IMHO I think the may have...

Congrats! Nothing like the feeling of the first time you plug in a guitar and play that first time when building an amp. Like pedals, it's addictive. I'm not sure why my wife complains about the room it takes up, I've only got five 100 watt heads, each with its own matching speaker cabinet...

Built this for my wife's nephew "Cooney", a bass player. Slider pots came from SBP, I like them better than the Tayda sliders. Enclosure came from Tayda, excellent fit & finish as usual. This is actually the second set of boards I put together for this build. The first set had an oscillation...

Mojotone has amp building classes from time to time.

The soldering process for eyelet boards is similar to building a PPCB pedal. Basically you just bend the leads so they fit the holes then solder. Most eyelets will have more than one component lead. I prefer to fill the eyelet with solder, others just add enough solder to stick the component...

Those dang bots have hit all the forums I think. I just checked, still no link to join, just to sign in. The newest member joined June 8, 2025.

I've tried to join the forum at Mad Bean but cannot find a link to sign up. Has he quit accepting new forum members?

Unfortunately this is what I have had to do. However, the general practice I use is turn on the mains while in Standby, leave it a minute or more to allow the filaments to heat up, then switch it out of Standby. I leave it out of Standby until well after I turn the mains off, after the filter...