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  1. Agree with oscillation. But, isn't a 1959 a...

    Agree with oscillation. But, isn't a 1959 a non-Master amp? And if you're getting THAT sound out of it, either you play LOUD, you modded it, or you're slamming the front end/guitar is superhuman.
    ...
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    Thanks Chuck, I'll check it out! I've got...

    Thanks Chuck, I'll check it out!

    I've got lots of regular & irregular amp values on hand, mostly 5%... I think I haven't had to ordered resistors for years, and only 22k last week. I also...
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    Thanks Dave, So re: large resistor: this would...

    Thanks Dave,

    So re: large resistor: this would actually be the easiest for me to do to what I already have, correct? Since I'd basically just tack the resistor in.

    Do you or anyone have any...
  4. Sometimes my phone auto-switches me to the mobile...

    Sometimes my phone auto-switches me to the mobile layout; I just go straight to the bottom & hit "View Full Site." That's the only layout change I ever get...

    Justin
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    Enzo, What I'm using is in my sketch. I have...

    Enzo,

    What I'm using is in my sketch. I have range roughly between -45 to -60V over the full travel of my pot. I just realized that my #1 scenario will completely bypass my pot & send max -V...
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    D'oh! Yes, you are correct! They're not wired...

    D'oh! Yes, you are correct! They're not wired like that, though. Hence, Doofus! Jusrin is having a field day today!

    Justin
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    Schematics!

    Okay, here is what I'm working with, and 2 possible scenarios. I am thinking #1 as the solution in case of an open wiper, as it will set me up for maximum negative voltage - in this case, about -55V...
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    Okay, I'm the doofus I'm trying to proof here......

    Okay, I'm the doofus I'm trying to proof here... The arrow across the resistor symbol... How is that connected?

    Jusrin
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    Doofus-Proofing Bias Supply

    Hey All,

    Finally have made excellent progress on my 4th build after a years. Now wanting to improve the Fender BF-style bias supply in it now. I have the negative voltage output coming from the...
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    Didn't that dude used to post here regularly or...

    Didn't that dude used to post here regularly or sumpin'?

    Justin
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    I wouldn't accept it without it. I think I...

    I wouldn't accept it without it.

    I think I should post the innards of some of my builds on this thread...

    Jusrin
  12. As for tube data sheets, I still think...

    As for tube data sheets, I still think tubedata.org is thebest thing out there. Often, for common amp tubes, Frank has multiple sheets from different manufacturers, and also sheets for multiple...
  13. I loved playing my 79 Vibro-Blaster through my 68...

    I loved playing my 79 Vibro-Blaster through my 68 2x15" CTS-loaded Bassman cab...

    Justin
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    The Russian guess is probably good... I'd contact...

    The Russian guess is probably good... I'd contact The Different Strummer from Vintage Guitar magazine; or whoever it is that covers offbeat weirdlings from strange countries.

    I like it!

    Justin
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    Ouch... I've never bought anything off eBay, but...

    Ouch... I've never bought anything off eBay, but in your case it sounds like it's nit been entirely worth it... Since I've already pulled the excess wiring for the internal shields anyway in mine, I...
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    Thanks for the offer, Randall, but I'm just gonna...

    Thanks for the offer, Randall, but I'm just gonna let this one be. But I'll explain Jusrin:

    Jusrin is my smartass/dumbass persona who is usually contributing nothing more of value than a joke, or...
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    Now I'll just play it til it blows up. Justin

    Now I'll just play it til it blows up.

    Justin
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    Smartass! ;) Jusrin

    Smartass!

    ;)

    Jusrin
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    So, just to screw around... First I tried lifting...

    So, just to screw around... First I tried lifting the leg of the .01/47k that was going into the input grid. My trem died conpletely & the overall volume of the amp went up & it was clearer. If I...
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    G1, It never had 6BK11s to begin with. It came...

    G1,

    It never had 6BK11s to begin with. It came with a 6K11 & a 6AV11, both of which are mostly lower gain triodes.

    Chuck is correct on the differences between a 6BK & a 6C. They are direct plug...
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    Hey Chuck, It's "better" than the ceiling fan...

    Hey Chuck,

    It's "better" than the ceiling fan thing now, just not near "swamp." It's definitely an improvement but when you're used to a 62 Concert or BF bug-trem, weeeeell...

    I agree that...
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    Hey, wait a minute... I've seen something like...

    Hey, wait a minute... I've seen something like that before. In my AB165 Bassman. Okay, for no other reason than shites & grins I'ma pull one end of that 47k resistor up just to see what happens....
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    Y'alls just went right over my head. I'll...

    Y'alls just went right over my head.

    I'll just say that the 250uF bypass cap made no audible difference except to make it take 2 whole seconds to get the trem on instead of less than half a...
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    Thanks Chuck, Yeah, when the 7591s are the...

    Thanks Chuck,

    Yeah, when the 7591s are the most easily sourced tubes in your amp, you have a problem!

    I can sort of figure out the trem circuit by folks' descriptions above, and it sorta makes...
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    Hey Helmholtz, Iwas these two I tried...

    Hey Helmholtz,

    Iwas these two I tried lowering. I tried them separately. The one specifically that you are asking about is the circled one on the left; "near the input" is just a vague location...
  26. Mine sound better after sitting in the car on a...

    Mine sound better after sitting in the car on a sunny day for a few hours.

    Jusrin
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    Returned the resistors back to 120K AND put in a...

    Returned the resistors back to 120K AND put in a 250uf/25V cap I had. No love. I may just start rebuilding the tremolo circuit one component at a time... All the resistors test well within spec &...
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    Thanks! Ill tray anything at this point. Not sure...

    Thanks! Ill tray anything at this point. Not sure I've got a 220uF but I've dwf got bigger than that...

    Justin
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