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  1. Replies
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    I have sent the amp back to it's owner since...

    I have sent the amp back to it's owner since posting this thread, it had a 25k pot across r160, it was dropping r160 to 0 but only between 9-10 on the pot, I added a 3.3k resistor across the pot...
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    Thanks for the links, I haven't heard back from...

    Thanks for the links, I haven't heard back from the owner yet, I added a resistor across the pot to reduce it's value, thus giving the pot response over the whole range instead of just between 9-10,...
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    iso madison divinity 2 schem

    I have the original divinity schem, I'm looking for the divinity 2 or if someone knows how the contour or "shape" control is supposed to be i.e pot value and where it should be connected.
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    madison divinity "shape"

    madison divinity 2
    One of the complaints on this amp was that the shape control didn't do much, and I haven't found a scematic that shows it, it has a b25k attached to both sides R160 3.3k (schem I...
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    sorry the pic was before I reversed the one on...

    sorry the pic was before I reversed the one on the positive rail, and the amp wasn't passing guitar signal other than scratches from dirty pots and reverb could be heard.
    The problem ended up being...
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    crate amp help g-212

    Crate G-212
    This comes on, power amp seems ok, had a thump when powered up, some controls made static with reverb, it won't switch off of channel A.
    It has been extremely hot around the zeners just...
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    Thanks guys, just wanted to make sure, they are...

    Thanks guys, just wanted to make sure, they are going in a cheap crate g-212, I already had the rc4558p's left over from rebuildinf an amped ss140c
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    4558 opamp question

    Might be a dumb question to some, but is a texas instruments rc4558p a suitable replacement for an xr 4558cp?
    I've looked at a few data sheets and from what I can find it looks as though it should...
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    got everything working like it should, q4 was...

    got everything working like it should, q4 was getting hot, it ended up being the solder connections on r322, the base emitter resistance on q5 was way off compared to the rest, now it's running cool...
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    Scratch that, this one is the 6 wire transformer,...

    Scratch that, this one is the 6 wire transformer, 3 rectifier version with pre amp out/power amp in.
    I replied earlier but I guess it didn't post.
    I found r322 disconnected, someone had previously...
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    this is the schematic I've been looking at ...

    this is the schematic I've been looking at

    55375
  12. Replies
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    sunn concert bass voltages

    I'm not sure exactly which one this is to post a schematic, it is a silver face, has rca jacks for the distortion pedal, and a single rectifier, my question is are all of the single rectifier...
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    Awesome!! thanks

    Awesome!! thanks
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    ADA quad tube 150 Schematic

    I'm looking for a schematic for the power section of an ada quad tube 150, I don't have the amp yet, the guy says the oreamp is fine but the power section is toast, it has burnt traces and no telling...
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    Got this one finished up, the chorus control...

    Got this one finished up, the chorus control wasn't an issue, it was me overlooking it having one for each channel, oops.
    As for the left channel: after pulling everything back out of the amp I...
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    it was worth a shot, I've gotten lucky before...

    it was worth a shot, I've gotten lucky before back when I was working on cb's and ham radios, called a shop looking for a part and ended up buying the whole inventory the guy had, dirt cheap too...
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    I did call loud, they no longer carry anything...

    I did call loud, they no longer carry anything ampeg, called ampeg, but it was after their hours, we'll see what they say when/if they reply to my message.
    The somewhat local place finally got back...
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    more progress made, finally got around to putting...

    more progress made, finally got around to putting those drop resistors in, power seems to be correct now, still no sound so I pulled the preamp board and found more surprises, burnt traces, one of...
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    I'm making progress, I'm still waiting on the...

    I'm making progress, I'm still waiting on the resistors from mouser, the went ups when I picked fedex, so it's taking longer than usual.
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    I understand they will get hot, but i thought it...

    I understand they will get hot, but i thought it was a bit excessive, they are dropping from 44v to around 20v then regulated to 15v, but somehow I missed that one was a 100ohm when it's supposed to...
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    that would be the ones, someone attempted to...

    that would be the ones, someone attempted to repair it before it was brought to me, that part of the board was a mess, caps soldered to the wrong side of the board, blown regulator, 2 blown op amps,...
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    the zeners after the regulators tested good, so...

    the zeners after the regulators tested good, so far I've lifted jw13, jw14, jw15, jw7(I think? going to pin 8 of ic5) r30, jw9 below jumper j3 trying to narrow down where the problem is.
    sorry...
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    I'm trying to track down what is causing r61 and...

    I'm trying to track down what is causing r61 and r62 to heat up, I'm afraid to keep it on too long until I find the cause
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    new 4558 in at ic9 and ic6, 15v and -15 are...

    new 4558 in at ic9 and ic6, 15v and -15 are correct now, it has channel switching and chorus, which it didn't to begin with, r61 and r62 are still getting hot, still no sound other than a hum when...
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    new thermisors from mouser installed and all is...

    new thermisors from mouser installed and all is well, jammed on it for about an hour tonight with no problems, but probably not loud enough to really heat it up.
    This is what I used, it had the...
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    I have a few emails out to a few somewhat close...

    I have a few emails out to a few somewhat close distributors that I found on ampeg's distributor list on their site, I've found a few that I could get to work, like the ones from fliptops could be...
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    new reg installed, but there was still little...

    new reg installed, but there was still little resistance between the -15 output and ground, I found 4558 ic4 cracked, so I lifted jw13 and jw15? (hard to read the schematic) to see if that got rid of...
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    well I have to apologize again, it is not a...

    well I have to apologize again, it is not a bayonet style (that's what I get for going with the first thing I read) These look like an older automotive dome light bulb, but the specs I posted look to...
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