Tube Amp Archive

Thanks Phil.

Hi Phil.

I hope he will too.

There was a thread some time back were a possible company in England was thought to be where the new Maggy company was buying their varistors from. Has anymore information been found/confirmed about this? The company has several vari's, that from their spec sheet, look like they could be used. The t...

Has anyone been able to get a copy of any of the New Magnatone vibrato amp schematics? Or has anyone got a hold of any of the NEW Maggy vibrato amps and made their own schematic? They are using new production varistors, I'm wondering if they had to tweak the circuit/change some R/C values to get the...

Hi cbass!

Some fine day we'll go back down to Ark. and thank you we will drop in and see you.

Brad

Thanks Ian for having a look at it. I'm working on a bread board so when I finish it I can put the circuit on it and see if she fly's. But if she doesn't I'll have no idea what might be wrong. Gibson's GA-83S does work as Vox copied it for their AC15/30's. I was thinking that Gibson found a little d...

Thanks Ian. I'm not sure that Gibson drew it up the phase shift circuit correctly? It's different then their GA-83S, GAV1 and the Wurlitzer vibrato that Gibson copied it from. (It's different from Vox's version of Gibson's too.) So I re-drew the GA-55V modulator/mixer circuit hoping to untangle it t...

Yes, thank you.

Brad

I've been going over this schemo and there seems to be a couple of flaws in the drawing and with Gibson schemo drawing there might be more. 1, is the B+ string looks like it's missing a 'dot'? (Red circle.) 2, is the wire connecting from the junction of the vibrato channels volume pot wiper and the ...

Ok, lets see if I can post the scan?

Big THANK YOU to ampdoc1!!!!!!!

Brad

Wow! Thanks!

I have that book and didn't think to look in it for the schematic.

I'll try and get a clean scan of it and post it here.


Brad

Never seen this model number. Tell us about this amp, tube line up, number as size of speakers. Can you post a photo of the front and back? I don't own one, so no pictures to post. From the W. Marx Jr. book on Gibson amps, p. 138; GA-55V, 1954-1958, 473 total built, 2 channels with 4 channel input ...

GA-55 with Vibrato. Yep. I ~think the vibrato (true pitch shift) is a mono version of Gibson's GA83S. The early Gibson stand alone vibrato unit is GAV-1. (These are what Vox copied for their AC15 and AC30, and/or the GA55V.) I've read/have been told that Gibson had a flood in the basement of 1 of t...

Does anyone have a copy they can post?

I can't find it anywhere.

Brad

Yes, Lonnie knew Ward and heard him playing through a Maggie and liked it so much he bought his own Maggie, so goes the story.

Thanks for posting those links!


Brad