Tube Amp Archive

A little update on this project. I've settled on a starting point for my schematic and started working on a layout. Apologies for the spaghetti wires, just something to get me started. I'll clean things up after I put one together. Modifications to the AA1164 circuit are pretty straightforward so fa...

Seems weird - unless being run near some serious power distribution transformers, I expect a decent buffer to be able to feed a 30’ unbalanced cable without any hum being picked up. Turns out I had the desk end connected to the wrong patch. So it was floating, hence the hum. Either way I did some r...

I'll do a bit of digging and try a couple different things, should be easy enough to find a solution. Thanks for the input, appreciated. I'll post later with my findings/progress.

hmmpf. I guess I've been using re-amp boxes my whole life not really thinking about what they do. Makes sense, low output impedance, high input impedance, everyone is happy. My main concern is noise from a long cable run. I tried running an unbalanced guitar level signal with a buffer to my 5E3 from...

I guess I didn't think about this too hard but... Basically I want to be able to run a balanced line level output from my recording desk all the way across the room to the amp. I don't need variable input impedance just a fixed input impedance that is happy to see the lowish (100 - 600Ohm) output im...

The input impedance will mostly be set by the 1k track resistance of the balanced level pot. The 100k pot will make negligible difference to anything as it's swept over its range. Apologies but I couldn't be bothered to work out the schematic from the string of photos linked to in the JML page. Fai...

I don't understand the point of the FX loop. You cannot generate much (if any) distortion from the stages prior to the loop, making the loop pointless. And the 250k value of the send level pot will result in mid way settings raising the ‘send’ output impedance to 62k, making the CF stage seemingly ...

Thanks for the replies! The 47k cathode resistor on V2a should probably be 47ohms? Yes it should The three shorting input jacks on the balanced input seem weird - would an xlr be used? I was planning on using one of those isolated plastic Marshall TRS switching jacks. My train of thought was: - when...

Hello Amp Garage Folks, Long time lurker/tinkerer here. I've done a bunch of builds ranging from great to awful but I've never been much of the sharing type. Might be that the covid isolation is finally getting to me but I'd like to make more of an effort to reach out to people, might as well be peo...