Adding Reverb to a Champ

[telentubes]

Adding Reverb to a Champ

My first attempt with schematic and layout software, as well as adding reverb to a circuit.
I'm hoping someone can check my work before I build this thing.

I've essentially taken the preamp section from a BF Princeton Reverb (very close to a Champ), ditched the Vibrato and plugged it in to a single 6V6, ala Champ AA764.

I added an extra filtering stage post rectifier, with the possibility of adding a choke in place of the resistor between the first and second 22uF/500V E-caps. The dropping resistor values for the other stages haven't been decided on yet.

Just want to have someone look at the added filtering and whether you think the transition to single ended will work. If I get the "go ahead", I'll start a thread in the "Fender" section of TAG. I have most of the parts and a chassis on hand.

Many Thanks.

Screen Shot Champ Reverb.png

[telentubes]

When I finally got around to building this thing, it went together without any major set-backs. Lots of head scratching though.

I shortened a longer Watts chassis and stuck it back together with Alumiweld. Curly maple face plate. MC iron. Mostly SOZO caps.
I wanted this amp to be quieter than the last Champ I built, so added an extra filter stage. I saved room for a choke in case I want to try that in place of the resistor.
The other dropping resistors are 1K and 12K.

Chassis Cut Down.jpg

Alumiwelded back Together.jpg

Champ Reverb Innards.jpg

Champ Reverb Chassis Tubes Up Front.jpg

[telentubes]

Here the finished combo.

Champ Reverb Front R.jpg

Champ Reverb back.jpg

[M Fowler]

I always enjoy your builds, done very well and great looking finished amp and cabinets.

Mark

[Stevem]

You might find it very interesting as I did with my VC to yank out the feedback resistor and use a pot to vary it on the back or underside of the amp!

[telentubes]

Thanks Mark.
Stevem... Seems like a good idea. I may give that a try. Plenty of room.

[JazzGuitarGimp]

That's a really nice build. And you've got a great sounding speaker in it.

[telentubes]

The G1265 sounds better in the Champ than any of the D style amps I've used them in. I have used the G1265 in single and paired configurations in the D builds and never thought they were very interesting. I have an Eminence Josh Smith Signature in my BFPR build that I think will be great in the Champ. I'll report back.

[Seiche]

I'm looking into something similar, what are your voltages, especially for the reverb driver?

[telentubes]

V1
pin 1,188
pin 3, 1.41
pin 6, 185
pin 8, 1.45
V2
pin 1, 279
pin 3, 5.6
pin 6, 279
pin 8, 5.6
V3
pin 1, 181
pin 3, 1.55
pin 6, 185
pin 8, 1.53
V4
pin 3, 360
pin 4, 362
pin 8, 22
V5
pin 2, 376DC
pin 4, 335AC
pin 6, 335AC
pin 8, 376DC
B+, 376, 369, 360, 285

Still very happy with this amp, although using the Princeton more these days.

[Seiche]

Many thanks!

[Nu2Dis]

@telentubes do you still have the DIYLC file for this build?

[Manurban]

Adding Reverb to a Champ

My first attempt with schematic and layout software, as well as adding reverb to a circuit.
I'm hoping someone can check my work before I build this thing.

I've essentially taken the preamp section from a BF Princeton Reverb (very close to a Champ), ditched the Vibrato and plugged it in to a single 6V6, ala Champ AA764.

I added an extra filtering stage post rectifier, with the possibility of adding a choke in place of the resistor between the first and second 22uF/500V E-caps. The dropping resistor values for the other stages haven't been decided on yet.

Just want to have someone look at the added filtering and whether you think the transition to single ended will work. If I get the "go ahead", I'll start a thread in the "Fender" section of TAG. I have most of the parts and a chassis on hand.

Many Thanks.

Screen Shot Champ Reverb.png

Hello,

Very nice build! what dropping did you finally use?

Could you share the last schematic and layout version? Diylc file also?

Thank you

[rafaelctt]

Hello, would this amp sound good with a 10-inch Celestion?
Thank you

[telentubes]

Built a head cab for this amp, yet to be finished (probably just amber shellac) an will use the combo cab for a push pull amp with a little more juice. Yet to be decided.

JPEG image-68EAE065D104-2.jpeg

JPEG image-68EAE065D104-1.jpeg