The Amp Garage

I haven't yet, I just tried a cap across the plate resistor of the first stage. I haven't bothered with the PI cap as the cut control only kills the oscillation when it's killing all treble essentially. So for the PI cap to work it'll have to do the same and would render the amp useless. I've just f...

Done a whole bunch more testing and getting confusing results. - With nothing plugged into the input jack if I turn the volume up above halfway I start reading a sine wave on the speaker jack. Quite a large sine wave at that. I can trace this back to the first gain stage. As I vary the volume the fr...

With the changes I made

Well I've been measuring the amp with a scope and it oscillates without anything plugged into the input jack. I can measure the oscillation (Seems to start at 18khz but also appears below 6Khz) from the first stage all the way to the output jack. Removing any of the valves individually stops it and ...

It mostly occurs with the amp volume above halfway. It stops if the guitar volume is on 0, if I have it on 1 or 2 it will be quiet and if I strum the guitar sound is clean with a load of fuzz on top. I can mitigate it a bit if I sit really far back from the amp, but as soon as the amp volume is abov...

My latest project, a Hammond AO-44 reverb amp rebuilt into a Vox AC15 with a built in boost. Amazingly on the normal setting it is quiet, the whole time I was building it I had doubts given how cramped it is! It is however unusable on the boost side, suffers badly from oscillation which I need to tr...

I think this solution has a few issues. If you simply bypass a stage using this stereo jack then you'll have a long wire run coming out of the amp to your pedalboard and with a high gain lead stage that could pick up a lot of noise. Especially since it will be hanging like an antenna when not in use...

What have you got so far to work with? Do you already have the Lo jack for the Avenger circuit? If so you could easily switch to bypass a gain stage. Or if you have an unused triode we have a huge range of possibilites for creating a simple clean channel. A photo of your current build would help.

Looks really cool! Nice work! Love the cabinet.

Are you asking if these transformers will fit the Wrocket chassis? If so, has the chassis been drilled for transformers already?

Sounds like it's going to be a suck it and see thing. I might have room for both, we'll see. I have seen Sluckey's conversion and studied it! Along with every other conversion I can find! I'll do a new thread when I start this but my plan for this build is the following: - Remove the EZ81 rectifier ...

I'm looking to rebuild a Hammond AO44 into a different amp but need to save space as the chassis is quite small! The amp will have two pre amp stages in series, both of which have 2.7K/22uF cathode resistor/cap combos. I'm wondering if anyone has tried doing this but with shared cathode resistors an...

Ok I've just seen the price tag, that's why they're not more popular. Not really in everyone's budget.

These new amps from Victory caught my eye the other day. https://www.victoryamps.com/product/mk-clean/ https://www.victoryamps.com/product/mk-overdrive/ Never played through a Victory but they've always intrigued me. They have Marshall style, Vox style and their own style. I don't know why they're n...

Any photos you can post of the amp? It's such a low gain amp is oscillation really that likely? Unless there is actually positive feedback on the output stage. When you say tone or volume between 9 and 10. Can you stop the hum if volume is on 10 but tone is turned down? And vice versa? Or do they bo...