Originally posted by Enzo
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OT transformer secondary issues
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This is the condition i got it in. missing vol control, 2 coupling caps and 2 of the 4 tubes were shot. good jan 5751 in the input and a nice 12at7 in the P.I.
Reminds me alittle of how Garnet amps are wired with the bias supply and rectifier circuit on a vertical board. even the silkscreening reminded me of garnet amps.
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Agree with you that you must have taps one step from each other. Either 2&4, 4&8, or 8&16.
Forget what the labels say. The transformers may even be from something else. I doubt someone using perf board like that would have ordered custom xfrmrs from Hammond, but who knows.
The impedance you need on the primary side will depend on the operating conditions. You can plug your numbers into the calculator on nickb's site here: Interactive Valve Data Sheets
Also, you can run the amp into different load impedances. Each tap should give max. power at closest to it's proper load impedance.Originally posted by EnzoI have a sign in my shop that says, "Never think up reasons not to check something."
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Originally posted by g1 View PostAlso, you can run the amp into different load impedances. Each tap should give max. power at closest to it's proper load impedance.
i contacted hammond about them and i gave them the marking info it had on it. Both the PT and OT were not typical models they would carry or make. nothing in their records came up. they were probably from a defunct amp company.
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Originally posted by ThisLifeILead View Postit would back up the measurements. but it seems like they are 2 steps away from eachother. 2/8 for both totalling 2800 ohms for the reflected load.This isn't the future I signed up for.
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