The Amp Garage

It's tight in that area. Could I accomplish this by instead soldering the 2 resistors directly to these heater lugs and the center ground in this photo? IMG_5504.jpg Yes, but first remove the resistors you already put in. Even better would be a 200 or 250 ohm pot, center to ground and both outer lu...

It's tight in that area. Could I accomplish this by instead soldering the 2 resistors directly to these heater lugs and the center ground in this photo?

I had the same problem. With my build it was the heater balance resistors not grounded at the same spot. It looks like that is the case with yours too: Screenshot 2026-04-11 084249.png Because you use 2 different sockets for the balance resistors, you might have used the same heater line twice. You...

Did you happen to move some cables when you got your amp into the cab? It sounds like a heavy 120Hz buzz. These could be tricky to find but this one is very obvious and probably one of your heaters or AC run is too close/ parallel to a signal path? Fred. No, nothing was touched inside the chassis. ...

I read the other thread but in that case the buzz was a happening from the start. This just started in my case, after few months after completion. Martin, its not the OD master, but rather the drive that greatly controls the volume of the buzz but you can clearly hear that it is present on the clean...

I completed this build a few months back and have been testing/tweaking since. Last week I finally got it into a head cab and then noticed that it was noisier than before. It was never dead quite before but I'm pretty sure the clean channel was. Is seems as though the noise is coming from the clean ...

My 124 has a 500K pot and after reading this I temporarily connected a 1M across pins 1-3 and set the resistance to ground around 25K. So far I like what I hear, but before soldering this in I was wondering if using a 1.2M resistor instead of 1M (which I currently have) would make a tonal differenc...

Reviving this oldie :D My 124 has a 500K pot and after reading this I temporarily connected a 1M across pins 1-3 and set the resistance to ground around 25K. So far I like what I hear, but before soldering this in I was wondering if using a 1.2M resistor instead of 1M (which I currently have) would ...

I purchased a set of mustard and piers from Francisco about 1-2 months ago. The 22K's are fine but the .1uf cap leads are too short to reach the turrets on a standard Marshall board. Just a heads up for anyone interested. I found no need to reach out to Francisco since it obvious knew this when pick...

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A lot has happened since my last post on this topic. Learned a lot. Purchased a scope (still learning it). Built a dummy load. Studied the various layouts/schematics on this mod. It ended up being the pre-gain pot. I replace that but I also remove the gain 2 pot and made adjustment to match this sch...

Sorry. Could this be deleted?

Would leaving the heaters the way they are be an issue? Nope! Heaters can stay as they are unless you're getting 60hz hum. It's possible it'd be quieter if you redressed the heaters to make use of twisted pairs on tube I'm suggesting be reassigned to become V1 (assuming you keep the "V0" assignment...

I came across this video on Youtube and thought this group would appreciate it. Cool story about one of one of his amps and the man himself

https://www.youtube.com/watch?v=J5crA4bqLv8

Cool build! With this unpleasant sound persisting despite fairly large grid stoppers that large all around, I'm wondering if this is blocking distortion versus an inaudible oscillation. I'm particularly concerned because of the layout of the first three gain stages being crammed so close together. ...