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  1. Replies
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    Thanks Juan! Painting it green did not occur to...

    Thanks Juan! Painting it green did not occur to me...uh wait, though, paint costs money... :)
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    Taming a Boss Hyper Metal HM-3

    Greetings, folks. Haven't posted on music-electronics-forum in a few years, life has changed and I don't play much with amp repair lately. However, I messed with a Boss Hyper Metal HM-3 last night...
  3. My scope has both variable holdoff and line sync,...

    My scope has both variable holdoff and line sync, I guess I never learned how to use either feature to their full advantage!
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    This cap tested good on my ESR tester and...

    This cap tested good on my ESR tester and capacitance also measured only about 10% over nominal value. Yet as you can see it has vented, so not something to keep around. Had this cap been radial,...
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    Did you try modeling it on Duncan's Power Supply...

    Did you try modeling it on Duncan's Power Supply Designer PSUD2 (free download if you don't have it already)
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    The decimal point didn't come through. Try 0.560

    The decimal point didn't come through. Try 0.560
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    That amp has an excellent clean sound when it is...

    That amp has an excellent clean sound when it is operating normally. It definitely should not sound hideous.
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    Ok, for others who may find this thread in the...

    Ok, for others who may find this thread in the future, amp is now fixed. The customer agreed to use substitute TO-220's so I got the MJE15030G for Q7 and Q9. I laid them flat, also added a finned...
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    I'm following this with great interest, I've got...

    I'm following this with great interest, I've got a Heritage VTX on the bench now, waiting for Q7/Q9 to arrive. I posted on that one maybe a week and a half ago, it's likely the post Enzo recalls. ...
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    1,573

    Customer doesn't want to modify the heat sink to...

    Customer doesn't want to modify the heat sink to use the TO-220, so as much as I don't like to use NTE, looks like I'll get the NTE280's.

    I did find a bad tube, real shame...was a quartet of old...
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    Thanks for pointing out the 90V on the cathode, I...

    Thanks for pointing out the 90V on the cathode, I didn't print out the full schematic and it's easy to miss stuff looking at the schematic on the computer screen.
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    I pulled them, both the 6465 drivers are bad...

    I pulled them, both the 6465 drivers are bad (measured on my little Peak transistor tester). Q6 and Q8 measured good on my tester but they may still be leaky. I have some 2N2222 that should work...
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    I dunno why, but my schematic shows up as a blank...

    I dunno why, but my schematic shows up as a blank screen, I've changed the file name, this forum software is very clumsy to post something with.
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    Peavey Heritage VTX driver checking?

    Customer brought over a Peavey Heritage VTX. Found a couple of bad opamps, replaced those. Now have clean signal all the way to Pins 1 and 7 of U9, and through the caps to the collectors of Q6 and...
  15. Listen for the sound the cap makes when it lands...

    Listen for the sound the cap makes when it lands in the bottom of a trash can. If it makes a "thunk", it needs replacing. If you don't hear a sound, get your hearing checked, and replace the cap.
    ...
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    The Gibson GA-19RVT schematic even shows the...

    The Gibson GA-19RVT schematic even shows the heater center tapped connected to the cathode of the 6V6 (that's the way my 1963 Epiphone EA-15RV came wired, though not shown on its schematic). I did...
  17. The schematic in Post #1 opened fine for me.

    The schematic in Post #1 opened fine for me.
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    I'm certainly no expert, but the chipamps web...

    I'm certainly no expert, but the chipamps web site has a section in their assembly manual on selecting the transformer and rail voltages for the LM3886 ...
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    The Watkins woofer had two voice coil windings,...

    The Watkins woofer had two voice coil windings, they could be used in series or separately. Never really caught on, though some early Infinity speakers used the Watkins woofer with two separate...
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    On the Talkbass forum, there have been many user...

    On the Talkbass forum, there have been many user complaints of similar failure with that particular amp, particularly the first generation. That does not mean that your amp failed in the exact same...
  21. Didn't think about evilbay...!!! They seem...

    Didn't think about evilbay...!!! They seem mighty proud of those little jewels, though.
  22. Does anybody still sell those little breakout...

    Does anybody still sell those little breakout adaptors that you plug into a tube socket, then plug the tube back into the adaptor; the breakout adaptor has test points so you can see what's actually...
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    I had a vacuum cleaner motor with an open thermal...

    I had a vacuum cleaner motor with an open thermal fuse, it was very accessible right on top of the windings. In the interest of...ahem...experimentation, I easily bypassed the open thermal fuse and...
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    Well, you never said you measured the resistance...

    Well, you never said you measured the resistance right at the primaries, only at the AC plug blades. We cannot surmise the transformer is bad with other components still in series with the...
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    Ultra, or Ultra Plus? Can you post the...

    Ultra, or Ultra Plus? Can you post the schematic?

    The Ultra Plus schematic shows 2 relays. K1 selects between Clean and Crunch/Ultra. K2 picks either Crunch or Ultra. So if it does switch...
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    Again out of curiousity, how about the old...

    Again out of curiousity, how about the old selenium rectifiers? Not that I'd want to go back to using them! (I've got a couple of unused ones still in their boxes, I believe)
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    Yet the Fender Princeton Chorus and Ultimate...

    Yet the Fender Princeton Chorus and Ultimate Chorus of the late 80's/ early 90's didn't use snubbers, and they used 1N5402 diodes. Both SS amps with what appears to be reasonably stiff power...
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    I have installed snubbers on the diodes, as well...

    I have installed snubbers on the diodes, as well as making power supplies without the snubbers, and I can't hear a difference. Of course, perhaps I have tin ears. But there sure seem to be a lot of...
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