| Author: | PhilS (registered user: 1422 posts ) |
| Date: | Sat, Jul 21st, 2012 @ 15:53 ( . ) |
John, We all wish that we could know for sure with the old Gibsons ;-}. I wrote to Accutronics in October 2011 to ask about the correct tank for the GA20RVT, which some people refer to as the "big brother" of the GA15RVT, though I think this is really a cosmetic comment, not a circuit comment. What prompted me to do this was my intention to clone the GA20RVT with a few mods, as I acquired a set of iron from a GA15RVT, which is supposed to be the same iron for both amps. I bought the lot on eBay from a guy in Whitehorse, YT! I wanted the interstage transformer, which went into my GA20RVT. I figured with the leftovers, I'd build another with a tube PI, but never got around to it, or maybe I should say I didn't get to it yet. Anyway, the curious thing is that the lot came with a reverb transformer (which I'm not willing to part with)! It is hard to know how good the records are, but they replied quickly that the original tank is 4FB2A1B, making it 1475z. Given what I know about Gibson amps (I own two of them and done a bit of reading), I am suspecting the 4FB2 tank was widely used. I'd be willing to go out on a limb and say that's the tank in the GA15RVT, too. Best, Phil |
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