The Amp Garage

I've always just used whatever makes the layout neater

This is a post-job report, just FYI, because this was something I had never encountered. DUT was a Carvin Nomad 112 in very good condition. Tubes would not light up. Heater voltage was present, but very low. I pulled all tubes out, and voltage was good at 6.4vAC. As soon as I would plug in one or t...

Here are the final schematics including PI/PA VVR. Thought your idea of a quadrupler was fantastic, so I've come up with a little PCB using a couple of the new MeanWell N78 series switchers - giving me a 12.5v heater rail for power tubes, and a 6.5v rail for the preamp tubes of what I'm building. I...

WIMA doesnt even make the capacitors in some of the Klon's values. and others they are only in a different footprint than this board was designed for. I am finishing it off with some TDK blue capacitors so unfortunately a mix of blue and red and green and gold and black as for your build. thats wha...

Through some breadboarding, I found a 220k plate resistor gave me the most gain out of a 6112 preamp stage. Anything bigger and gain dropped off again despite what the plate curves said in theory. Then I tested bias point between grid clipping and cutoff and got the following values of cathode resi...

One I even tried to go with more expensive caps but the wima caps aren’t available in every value needed Are you using Mouser for WIMA caps? Never encountered a value they haven't had. Those are some sweet PCB's btw. Also did the wanky thing with PRP 9372's for a meme a while back. Made absolutely ...

I also socketed them. Soldered the submini into a DIP-8 machined pin socket. I made a PCB for my amp, so it also has DIP-8 machined pin sockets for the valve locations. Then the submini socket plugs into the PCB mounted socket matching orientation marker. My submini build was 16 years ago. I'll dig...

Did you socket them, mount the tubes on a strip, or run the tube leads to their respective connections? I have a small pile of pencil tubes I've been meaning to use and am curious about mounting and potential problems. Thanx. For both 5 and 8 pin tubes I cut the leads about 1/4" long and solder the...

Howdy, Love using subminiatures and while I've got a couple of scratch-builds under my belt, I'm looking at emulating a couple of the most classic amp topologies with them. While the power amp situation is obviously different, my focus at the moment is just getting the pre-amp as close to the 'origi...

Long shot, does anyone happen to have any info and/or a schematic for this rack reverb unit? I emailed Soldano and asked if they could consider releasing the schematic on it since it's been long out of production but no reply. It looks like a fairly simple design and almost can see enough to figure...

Looking at a klon pedal. Or overdrive pedal in general. I see some places saying use metal film for everything and some saying to mix them for the klon like the original. Is there a difference in sound/feel/etc if you were to build a klon using all metal film resistors? There is no benefit whatsoev...

About a year ago I had to change some stuff with a Mouser order, and they were INCREDIBLY helpful. I've also had a couple of technical questions about products that were answered within 24hrs. The last order I made I needed to add a couple of IC's, and contacted customer support within a minute of m...

Thanks pullshocks, but it turns out that wasn’t the end of it. The next day I went to play it and got absolutely no sound (but the pilot light was consistently bright). Out of the cab again, bring it up, check voltages, inspect important connections, everything normal. Plug in a guitar and get fain...

xtian wrote: ↑Thu May 23, 2024 1:50 am So, the input to this module is 120vAC wall voltage? And rectified output is 350vDC?

12vDC in. 350vDC out (with only a bleeder). Drops to about 260v out with a 10w load.

https://i.ibb.co/tPN0qP5/image.png https://i.ibb.co/myqx4fs/image.png https://i.ibb.co/YfdP4V5/image.png Photos of the mods I made - I did need to move a resistor around to squeeze the caps onboard, and I removed the kv cap associated with the AC output (as I'm not using it). Obviously not the neat...