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  1. Jukeshoe
    12-12-2011 02:04 AM
    Re: tubes swaps...yeah, that's kinda what I'm trying to do.

    Re: sending tubes...I very much appreciate the offer, but I think I'm going to wait until I hear back from a guy who works with guitar amps specifically to reply to several of the questions I have in general.

    As for number of tubes, it's got two big power tubes, and six smaller ones for a total of eight...6L6GC (x2), 12AT7 (x2), 12AX7A, 7025 (x3).

    I'm pretty sure I need to replace any tubes with the exact same tube (Groove tubes, exact model) or else I'd need someone to open her up and rebias stuff (at least that's my understanding from reading up on all this...could be mistaken though). That's not a step I'm willing to take at this time.

    Thanks again for all the help and input, Bill!

    It might be a bad cap that's causing the problems in which case I'll need to take it to a tech, because I'd not even begin to know how to fix it.
  2. Jukeshoe
    12-11-2011 12:08 AM
    Yeah, definitely not opening the chassis up...just pulling out tubes, stuff like that. No way I'm actually gonna do any real work. I don't have a multimeter, and I certainly don't have any clue either.
  3. Jukeshoe
    12-10-2011 05:19 PM
    Thanks for the fuse hookup info, I hadn't run across those in my search!

    I don't even know how to begin to read schematics...

    I'm hopeless!

    I was not aware you could plug different tubes in to get different percentages of power...I agree, though, if the tube that looks "off" is just the tremolo tube, I don't think that's the source of my problems.

    I've spent all afternoon on various guitar tube amp forums, trouble shooting websites, etc trying to figure this stuff out and it's giving me a massive headache (literally).

    Jukeshoe: <---Just wants to play guitar, man!
  4. Jukeshoe
    12-10-2011 04:26 PM
    1977 Fender Silverface Pro Reverb is what I'm working with here.

    I'm having one hell of a time finding a 2.5 amp/ 125 v slo blow fuse on line.

    Any magical suggestions on a good fuse dealer?

    Sounds like the 12ax7a is actually the "Tremolo: 12AX7 (photoresistor)," whatever that means.
  5. Jukeshoe
    12-10-2011 04:08 PM
    Ha! No probs!

    Hmm, lower gain would mean less power/loudness, correct?

    Can I just plug in a different preamp tube and expect it not to go haywire?

    Good to know re: the fuses.

    Thanks for taking the time/effort to answer my questions, Bill, I really appreciate it!
  6. Jukeshoe
    12-10-2011 03:11 PM
    Another question: if I get any other brand of tube, do I need to "re-bias" the amp? I read something about that online and didn't understand it very well. Does that mean any other brand might not have exactly the same properties and something inside the chassis needs to be tweaked?
  7. Jukeshoe
    12-10-2011 03:10 PM
    Remember: dealing with super noob here.

    Well, the preamp tube I'm suspicious of is a Groove Tube GT12AX7M (ECC83/7025)...basically a newer version of the 12AX7A (as I'm sure you're aware of). I'm suspicious of it because when I fire the amp up, all the tubes glow a nice soft orange at both the base (by the pins) and at the bottom (near the tip) except for this one. It glows soft orange just at the pins, the rest is dark.

    Another question...the amp calls for a 2 1/2 amp 125 volt fuse. Will a 2 1/2 amp 250 volt fuse work just as well or must it be 125 volt?
  8. Jukeshoe
    12-10-2011 01:05 AM
    Ideally I'm looking to troubleshoot as much as possible without opening the amplifier chassis. That's in over my head and I'd just end up electrifying myself.

    I think I might have a bad preamp tube that's causing my fuse to blow...that's my initial hunch based on some stuff I've been reading up on. Basically the amp works fine for 2-10 minutes and then blows the fuse after crackling, cutting in and out, and then getting very soft in volume.

    Thanks for the recommendation!
  9. Jukeshoe
    12-09-2011 06:33 PM
    Yo Bill!

    I was wondering if you know of a good tube amp forum. Remember me asking about that '77 Pro Reverb that I've been having problems with? I finally got it out of storage and am looking to fix it up (if possible). Didn't know if you had a site you could recommend or not.


  10. solomon.trenton
    12-07-2011 06:02 PM
    thats nuts. ours gets dropped off by like 2pm

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  • About billnchristy
    At "the Y"
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