The Amp Garage

Just a word of caution on these piher balance trimmers. If they sit for a long while not having been moved, they can develop an oxidation and non-conduction over time when you do move to a new setting. This just happened to me on an AB165 build where I had implemented that balance trim put for the ...

Nice! This motivates me to pull out my empty Erwin chassis too and get to work. What are the relays going to switch please? On my previous Erwin-sourced chassis I found those wing nuts stripped super easily after a couple of uses. I ended up drilling out slightly larger holes and using normal chass...

Here's what the build looked like a few days ago. Heater wires done, working on power tubes. Mounted 12v transformer for relay power. Whe I went to mount the 12v rectifier board found it wouldn't fit, caps were too big and interfered with PT. Ordered some physically skinnier caps, now waiting for th...

Congrats on keeping the ever elusive magic smoke contained!

Great looking build! I like your color choice for the heater wires, you'll see why soon...

Have you used the Jupiter caps before? If so what do you think of them?

Edit: spelling

Hi Glenn, I'm excited to watch this build! I wanted to also drop you a note to thank you, because seeing your post reminded me I forgot to order those doohickeys for my two Erwin chassis. -Dan My pleasure Dan, you're welcome. Thank you, it's feedback like this that makes posting feel worthwhile! He...

Found these at Grainger.

Hello. My name is Glenn and I'm an Ampaholic.... :D After several months of saving my pennies-which was actually just stalling and trying to talk myself out of it-I ordered a SSS Chassis from Erwin. Told myself I was just getting one before he sold out of them, I'm going to put it away for a future ...

Not sure if I'd ever need to switch it in or out mid-song, great question to consider if it's worth putting on a pedal. The relay was used primarily to keep the wire runs shorter. My goal was to keep it as close to 102 as possible when the Dumbleator was not in use. The possibility of putting it on ...

bcmatt I did a very similar build, if I were to put together a schematic of my build it would look nearly identical to what you pieced together. On mine the switch to select or bypass the Dumbleator is actually a relay. I did this mainly to avoid long signal wire runs to a switch. Where I was able t...

Found a Gen 3 schematic and it matches the layout.

Something I noticed and am curious about. The green wire goes to the 220k OD entrance, then to a 33k then to OD1 input. The junction of the resistors is tied to ground on the layout. Is this really supposed to be grounded? With it grounded the signal is only passed by the 1m2 resistor.

Never mind...

Typically when I check voltages I have a dummy load connected to the output. Recently I had a speaker connected and when I checked plate voltages on the preamp I noticed a POP sound as I touched the probe to the point I was checking. Maybe you can use this as a method to narrow down where the signal...

I'm not real familiar with 2nd Gen. Is it supposed to have an OD entrance trim pot? Unable to see under the board but something seems off to me in that area. Where does the green wire land?

Thanks!

Looks like V1 pin 5 (heater) has no solder. Not sure this is enough to cause no signal. Still looking....