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  1. Replies
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    Double check to be sure you got cap polarity...

    Double check to be sure you got cap polarity correct on all the caps you replaced. C38 is a bias voltage filter, so the positive side will go to ground.
  2. ^^^^^^ I'll go back to this. Often resistors...

    ^^^^^^ I'll go back to this. Often resistors darken, but don't change value much. Measurements might at least get us in the ballpark.
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    I wish I could like that twice! I've never...

    I wish I could like that twice! I've never considered that...... and it's brilliant!
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    Even though only the filaments are tied directly...

    Even though only the filaments are tied directly to the AC line, it's still potentially dangerous because it's not totally isolated. I'd add an isolation transformer, fuse, and grounded AC cord....
  5. The number of speakers makes no difference...

    The number of speakers makes no difference whatsoever when adjusting bias, as long as overall impedance is correct.
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    ^^^^^^ Yes, that. You don't want to try removing...

    ^^^^^^ Yes, that. You don't want to try removing anything but the sticker or you'll destroy the speaker (if one didn't want the sticker).
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    I believe he's talking about just the tan...

    I believe he's talking about just the tan sticker. It's only a paper sticker.
  8. Check voltage at output tubes screen grids. You...

    Check voltage at output tubes screen grids. You could have open screen resistor(s).
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    You'll need to install an app for reading .pdf...

    You'll need to install an app for reading .pdf files. Adobe Acrobat is one of many.
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    Perhaps a Weber recone of the original speaker?

    Perhaps a Weber recone of the original speaker?
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    That SAC187 is part of Peavey's "crowbar" circuit...

    That SAC187 is part of Peavey's "crowbar" circuit and is a triac for speaker protection. If the amp outputs DC, it turns on the triac and shorts the output to ground. Good for speakers,...... not so...
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    It's -8 degrees wind chill here tonight, which...

    It's -8 degrees wind chill here tonight, which should be against the law.
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    Don't bust your balls over it. I'm in no hurry...

    Don't bust your balls over it. I'm in no hurry whatsoever. It's not something I'm in dire need of. On top of that, it's getting cold out there!
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    It's an old amp. Have the filter caps been...

    It's an old amp. Have the filter caps been changed?
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    55928 If you pull V1, is there still hum?

    55928

    If you pull V1, is there still hum?
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    That's not what "that other guy" used to say! ;)

    That's not what "that other guy" used to say! ;)
  17. That's my method, also. I confess, I do just use...

    That's my method, also. I confess, I do just use alligator clips, though. Just make the connections with power off for safety.
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    Enzo, PM me with price/shipping/payment info...

    Enzo,

    PM me with price/shipping/payment info and I might take it off your hands. :thumbsup:
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    My .02: None of those things will effect the...

    My .02: None of those things will effect the "Blackfacing" part.

    1) the 100UF totem pole caps are close enough to the older 70UF. In fact if you measure a lot of the old caps, their actual value...
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    What transformer is in there now and are you sure...

    What transformer is in there now and are you sure that's what fried the cap? Any part numbers on the transformer you have? Maybe it could be made to work?
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    I've soldered plenty of those. Also found this if...

    I've soldered plenty of those. Also found this if you end up needing one.

    https://www.ebay.com/itm/LM307-307T-LM307H-Operational-Amp/123126888611?hash=item1caaef38a3:g:o2AAAOSwVL5a9eQT
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    The amp has already left the shop. There are/were...

    The amp has already left the shop. There are/were 2 channels- a clean channel and a dirty channel. The dirty channel also had a more/less drive switch, so kinda sorta 3 channels. The gain knob was...
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    Thanks Tom, but both of those are the 4 12AX7...

    Thanks Tom, but both of those are the 4 12AX7 versions. It's deceiving because they don't show the PI in some of those schematics. I do appreciate the effort, though!
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    Well (no thanks to Splawn) I figured out the amp...

    Well (no thanks to Splawn) I figured out the amp anyway, so no rush on finding a schematic. Someone had decided to turn the "SOLO" footswitch into a switch for the "EFFECTS LOOP". They had cut...
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    Need Schematic for Splawn Quick Rod

    As the title says, looking for a schematic for the Splawn Quick Rod. I need the early version with only 3 12AX7 tubes. I have the newer version schematic with 4, but not the same. Someone has gotten...
  26. Thread: JBL EON 10P

    by The Dude
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    If it's across a filter cap and is indeed a...

    If it's across a filter cap and is indeed a zener, cathode of the diode would go to the positive side of the cap. If you still have the original diode (and a magnifying glass like me), see if you can...
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    I wonder, since it's an alternate part, if it's...

    I wonder, since it's an alternate part, if it's not contacting the traces properly. Check each end to the part it connects to. In other words, measure continuity to the jack on one side of the cap...
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    Ampeg has not yet discovered lock washers.

    Ampeg has not yet discovered lock washers.
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