Search:

Type: Posts; User: Leo_Gnardo; Keyword(s):

Page 1 of 18 1 2 3 4

Search: Search took 0.04 seconds.

  1. I'm sure someone can expand on this: to the best...

    I'm sure someone can expand on this: to the best of my knowledge, when Marshall started to become a "thing" in the USA, very late '60s, they started to have their amps imported through an agent. The...
  2. Remember that without power tubes installed, all...

    Remember that without power tubes installed, all voltages will read higher than they will with power tubes installed. The current draw of their filaments plus current draw on the high voltage winding...
  3. OK now I know which R we're talking about. It...

    OK now I know which R we're talking about. It wasn't clear, now it is. BTW first time I'm seeing that particular schematic. Notable, the way their draftsman listed "USA variant" parts in a separate...
  4. I agree Helmholtz. Also, what I observe is that...

    I agree Helmholtz. Also, what I observe is that the inverter/driver tube has a hard time driving those 82K's. I often see one side of a sine wave collapsing before the amp reaches clipping. Subbing...
  5. Interesting! Can't say I ever saw 47K's in that...

    Interesting! Can't say I ever saw 47K's in that position. Occasionally 82K though, factory installed.
  6. I thought there might be some howling noise...

    I thought there might be some howling noise coming out of the tank drive jack, but upon reading your edited post #7 seems not. I'll have to keep The Dude's suggestion on file too.
  7. Maybe I missed if you checked this, is some sort...

    Maybe I missed if you checked this, is some sort of unexpected signal being sent out the reverb drive line? FWIW I've had reverb drive transformers apparently with internal insulation breaking down,...
  8. You're way too good at recordkeeping nevets. I'd...

    You're way too good at recordkeeping nevets. I'd have to go thru boxes of paper records. Lucky if I could get it done in a day. And if they demand photocopies of the invoices from Mouser, Newark,...
  9. Replies
    6
    Views
    157

    Imma thinkin' you have an EL84 that's on its way...

    Imma thinkin' you have an EL84 that's on its way to going white inside - it has a failed vacuum but hasn't oxidized to the point it's obvious. On rare occasion I've seen similar.

    Of course, I...
  10. Sometimes, to make progress, you have to take a...

    Sometimes, to make progress, you have to take a step backward. Which step ... that is the question.



    OK now you have to get that bias voltage up a tad. Vb somewhere in the mid -50's looks like...
  11. FWIW Fender has been sourcing octal sockets from...

    FWIW Fender has been sourcing octal sockets from Ruby for quite a while now. Maybe 10 years, even longer? So it may not be unusual for other Ruby parts to show up in Fender factory builds.

    I'd...
  12. Replies
    23
    Views
    304

    Once again Enzo hits the spot. I have used common...

    Once again Enzo hits the spot. I have used common 1 Meg aud taper pots in Gibsons and other ancient amps where 2M are original installs, no problem at all. Slug one in there and worry no more.
    ...
  13. Generally, the better quality VU meters have a...

    Generally, the better quality VU meters have a screwdriver adjustment at the bottom center of the bezel, to set the meter rest point at its no-signal resting point. Give it a little tweak and you'll...
  14. Replies
    11
    Views
    205

    No, everything was fine until Mister Shortpockets...

    No, everything was fine until Mister Shortpockets started reading disinformation from dubious "experts" on the interweb.

    Plenty of times I've installed new tubes and come up with less than 100W....
  15. You can probably fix that too. Of course it helps...

    You can probably fix that too. Of course it helps to have a schematic. Often the problem is in the power supply, worth checking out first. Sometimes it's the CRT. I've revived a couple of scopes that...
  16. Replies
    19
    Views
    389

    Good ol' fashioned build, wires all laced up,...

    Good ol' fashioned build, wires all laced up, ready for Sunday School. I note on your schematic there's no phono input. So - on the amp is there one or only a mic input? Either way it looks like a...
  17. Replies
    19
    Views
    389

    OK, that makes sense. And you can dispense with...

    OK, that makes sense. And you can dispense with those components I mentioned. Likely you're not going to use the mic input either. The resistor between the input jack and first tube's grid can be...
  18. Replies
    19
    Views
    389

    Good point. Maybe nice big bulbous 6L6G's too. It...

    Good point. Maybe nice big bulbous 6L6G's too. It would be nice to know what's the B+, but I wouldn't stress those old caps by surprising them with high voltage after they've been sleeping for...
  19. Replies
    19
    Views
    389

    The schematic shows no taps on the transformer's...

    The schematic shows no taps on the transformer's secondary. Looks like it's indeed a 70V system or something similar. Funny thing another correspondent on another thread has us transformer hunting...
  20. Some 'a them tubes got saggy screens! And yes...

    Some 'a them tubes got saggy screens!

    And yes it IS annoying to have to personally buy inventory for an outfit that ought to stock their own. I can tell you stories ... in any case every tour I...
  21. Replies
    17
    Views
    280

    I agree. Either $155 or 130 is too much for that...

    I agree. Either $155 or 130 is too much for that kind of OT, unless it can't be had elsewhere.

    Back to Amp Parts Direct, we're looking at any of the following ClassicTone models: 40-18006,...
  22. Replies
    35
    Views
    818

    Maybe one of the "old timers" can answer this one...

    Maybe one of the "old timers" can answer this one for me. Taut-band meter? We had a very nice 'taut band' Triplett VOM on the bench at the workshop at my college. The needle always took its good ol'...
  23. Replies
    17
    Views
    280

    Enzo's is a very good question and I'm sure...

    Enzo's is a very good question and I'm sure directed at Wombaticus. "Dinky," apparently Mesa's OT looks compact compared to other OT's claiming similar power handling. My view, if there's not enough...
  24. Replies
    17
    Views
    280

    Primary impedance - you should have asked when...

    Primary impedance - you should have asked when you called Mesa. Know? I don't, but if it's compatible with both 6L6 and EL34, you could look at other OT's that are recommended for use with those...
  25. Replies
    17
    Views
    416

    Just in time for Halloween, looks like it's...

    Just in time for Halloween, looks like it's painted in blood. Might appeal to Charlie Manson types. Yikes! :evil:
  26. Replies
    119
    Views
    32,441

    Every now & then I get someone who wants me to...

    Every now & then I get someone who wants me to build them an amp from scratch. Or even better, gut an amp & build a fresh one. They expect to pay for the parts - a couple hundred dollars no more. Or...
  27. Replies
    19
    Views
    389

    That transformer may be intended to drive what's...

    That transformer may be intended to drive what's called a 70 volt system. That's how many "distributed" PA systems are wired, like those with lots of speakers in the ceiling. Like in an office, or a...
  28. Replies
    119
    Views
    32,441

    Welcome to the brave (?) new world of amp repair....

    Welcome to the brave (?) new world of amp repair. That's how it's done now. Unless you have some super dedicated microscope-eyed tech that enjoys changing out flea size components, and fixing burnt...
Results 1 to 28 of 500
Page 1 of 18 1 2 3 4