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Re: Someone hacked up my Vox...need some advice.

10/18/2004 8:41 PM
Nick	Re: Someone hacked up my Vox...need some advice. Thank you Anon, for your contribution. Bruce, I'll snap some pics of the head tomorrow and post them. I guess he took a high-res pick of the pre-amp tag board before he ripped it out, for reference. So he's gonna email me that, which I can post as well. The amp is identical to Joe Piazza's redraw on the Schematic Heaven site: http://www1.korksoft.com/~schem/voxamps/ac50.pdf But...I never looked too close at the tone stacks to see if they were wired with or without the 'mistake' on the bass pot (I think that's what you're referring to). But they definitely act differently now. I'm not sure if that's due to the new parts, or if he wired them up according to a schematic, as opposed to how they were in the amp originally. What gets me is we spoke on the phone numerous time about him not touching the circuit except for replacing any bad components, or ones that were drifted very far off. I was pretty upset when I popped it open. I sat down with my meter, and this schematic, and I was able to place about 70% of the parts in the amp. I haven't wired them in yet, as i'm waiting for him to email me that chassis pic so I can make sure I orient everything in the same direction it was originally (coupling caps with the same side tied to plate, plate R's with the same side tie to B+...). I'm not sure what I want to do about my 100K R's (7 total- 5 plate R's, and 2 slope R's for the tone stacks)...as they're all drifted to different degrees. I'm also not sure what to do about my 56K's, because one is reading 62K, and the other 67K. They're both cathode resistors for the direct coupled stage before the TS. The mustards are all dead on tolerance, so no worries there. The PF range caps are drifted all over the place...though I can place them visually when I get that picture, as they're different sizes and the leads are cut different lengths. I know a few things have to be changed, as there wasn't any free real-estate on the tag board originally...there still isn't, but where the cathode bypass caps were stacked over their respective R's, they're in their own slots on the board now. I've got to trace out exactly what he did in there. What a nighmare. -Nick

10/18/2004 8:41 PM

Nick

Re: Someone hacked up my Vox...need some advice.

Thank you Anon, for your contribution.

Bruce,

I'll snap some pics of the head tomorrow and post them. I guess he took a high-res pick of the pre-amp tag board before he ripped it out, for reference. So he's gonna email me that, which I can post as well.

The amp is identical to Joe Piazza's redraw on the Schematic Heaven site:

http://www1.korksoft.com/~schem/voxamps/ac50.pdf

But...I never looked too close at the tone stacks to see if they were wired with or without the 'mistake' on the bass pot (I think that's what you're referring to). But they definitely act differently now. I'm not sure if that's due to the new parts, or if he wired them up according to a schematic, as opposed to how they were in the amp originally.

What gets me is we spoke on the phone numerous time about him not touching the circuit except for replacing any bad components, or ones that were drifted very far off. I was pretty upset when I popped it open.

I sat down with my meter, and this schematic, and I was able to place about 70% of the parts in the amp. I haven't wired them in yet, as i'm waiting for him to email me that chassis pic so I can make sure I orient everything in the same direction it was originally (coupling caps with the same side tied to plate, plate R's with the same side tie to B+...).

I'm not sure what I want to do about my 100K R's (7 total- 5 plate R's, and 2 slope R's for the tone stacks)...as they're all drifted to different degrees. I'm also not sure what to do about my 56K's, because one is reading 62K, and the other 67K. They're both cathode resistors for the direct coupled stage before the TS.

The mustards are all dead on tolerance, so no worries there. The PF range caps are drifted all over the place...though I can place them visually when I get that picture, as they're different sizes and the leads are cut different lengths.

I know a few things have to be changed, as there wasn't any free real-estate on the tag board originally...there still isn't, but where the cathode bypass caps were stacked over their respective R's, they're in their own slots on the board now. I've got to trace out exactly what he did in there.

What a nighmare.

-Nick

Replies:

Wild Bill Nick, things might not be as bad as... -- 10/19/2004 7:30 AM