Adding Reverb to a Champ

[Dangudan2]

Thank you, Sluckey, I was looking at the tube data sheet wrong!

[Dangudan2]

Many thanks to Telentube who started this thread for his layout and everyone else who has helped me along the way. The amp is very quiet, and very happy with the reverb I did a few things different, since I wanted to fit this in a Vibro champ chassis I used a can capacitor instead of individual filter caps. There was plenty of room next to the PT for the rectifier tube. I also added a dwell control, NFB pot, and a screen resistor and grid stopper on the power tube. I added a few connection points on the eyelet board, and a 4/8 ohm output switch. I have yet to build the cabinet for it. because of health reasons, I need it to be as light as possible, and going to make this a head unit, and put my reverb tank in the speaker cabinet. I tried to add an audio file so you can hear it, but even 8 seconds it says it’s too large.

[lonote]

That looks very nice.

I had a nearly identical build that I made a head cab for, but I tried to put the reverb tank in the bottom of the same cab, in a separate compartment with shielding.

But I could NOT get it quiet & ended up making it a combo to get the physical distance for the tank, away from the circuitry.

[exnihilfit]

Many thanks to Telentube who started this thread for his layout and everyone else who has helped me along the way. The amp is very quiet, and very happy with the reverb I did a few things different, since I wanted to fit this in a Vibro champ chassis I used a can capacitor instead of individual filter caps. There was plenty of room next to the PT for the rectifier tube. I also added a dwell control, NFB pot, and a screen resistor and grid stopper on the power tube. I added a few connection points on the eyelet board, and a 4/8 ohm output switch. I have yet to build the cabinet for it. because of health reasons, I need it to be as light as possible, and going to make this a head unit, and put my reverb tank in the speaker cabinet. I tried to add an audio file so you can hear it, but even 8 seconds it says it’s too large.

This looks great, can you share the final schematic you used?

[Dangudan2]

Thank you lonote and thanks for your help. I was working with that today, I have the chassis on two by fours and I used some spacers and propped it up about an inch higher and put a 8AB2C1B short 3 spring tank under it toward the front with the output, facing away from the power transformer, and there was about 80% less hum than having it oriented the other direction. Almost acceptable, except for this amp is so quiet without a guitar plugged in I had to put my ear down by the speaker with the volume turned up to hear some white noise to know that it was on. So I don’t want to give that up. I had to lift the amp about four or 5 inches higher away from the reverb tank to totally get rid of the noise. I had the same thought of trying to build a partition and shield it. But I am worried that I may end up with the same result after a lot of work. I want to keep the head cabinet as small as possible to keep it light, so I think I’m going to go with my original idea of placing the reverb tank in the speaker cabinet.

[Dangudan2]

Exnilhilfit, I don’t have the software to make schematics. I took a schematic from a Princeton reverb and a champ amp and cut and pasted them together. So I can offer you this, which I started with. Once I started doing my eyelet board on graph paper, I found this thread. Telentube has a full layout and schematic at the beginning of this thread. Hopefully this will help.

[exnihilfit]

Exnilhilfit, I don’t have the software to make schematics. I took a schematic from a Princeton reverb and a champ amp and cut and pasted them together. So I can offer you this, which I started with. Once I started doing my eyelet board on graph paper, I found this thread. Telentube has a full layout and schematic at the beginning of this thread. Hopefully this will help.

That looks great, I have a champ 600 conversion in the pipeline and a mojo mini reverb that fits just right on that cab, I'm going to give it a try!

[Dangudan2]

This is what I ended up with, thanks again to everyone that helped me. I’m really pleased with the sound of the amp, it’s best through a cabinet that I have with 2 10” Celestion’s. I keep the long spring reverb in the speaker cabinet, that gives plenty of isolation so the amp is really quiet.