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I know it's a very, very long shot, but has anyone ever actually measured the B+ secondary voltage in an Epiphone EA-12 RVT or a tube-rectified Gibson GA-30 RVT. The Gibson GA-40T also uses the same PT, TF-60-P. (The SS-rectified GA-30 RVT is a very different amp.)
I have a couple of different options for replacements, among them, Mercury and Classic Tone, and I'm working backwards from the schematic based on datasheet estimates of the output stage bias given 2 x 7591 in fixed bias.
Edit: To answer my own question for anyone for future reference, I finally noticed the small print on the GA-40T schematic that indicates the B+ secondary as being 700VAC (350 - 0 - 350). This matches the Classic Tone 40-18060 very closely, and I think it will fit the existing mounting holes.
Gibson is always an adventure. Cross-reference from the amp you have to the schematic for a different model that actually matches the amp you have, and then to another schematic to find the specs on the transformer.
I have a couple of different options for replacements, among them, Mercury and Classic Tone, and I'm working backwards from the schematic based on datasheet estimates of the output stage bias given 2 x 7591 in fixed bias.
Edit: To answer my own question for anyone for future reference, I finally noticed the small print on the GA-40T schematic that indicates the B+ secondary as being 700VAC (350 - 0 - 350). This matches the Classic Tone 40-18060 very closely, and I think it will fit the existing mounting holes.
Gibson is always an adventure. Cross-reference from the amp you have to the schematic for a different model that actually matches the amp you have, and then to another schematic to find the specs on the transformer.