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In Reply to: Losses in Output Transformers posted by Triode_Kingdom on September 15, 2021 at 12:48:44:
After scouring various RCA literature and searching all over the Web for examples of comparable 6L6-type amps, I think it's possible to infer a few relevant points. First, I believe the output power data in tube manuals is derived mathematically from the curves and load lines, not from physical testing. This means not only that no real world losses are included, but also that there's probably more room for error in the spec than would otherwise be the case. This assumes, of course, that the numbers are legitimate and that engineers of the day weren't influenced by the competitive nature of profitability. Second, the real output power from this amp is in agreement with others. The examples I found that make significantly more power all utilize much higher voltages (such as found in Fender guitar amps) or parallel output tubes. In fact, this amp seems to be performing as well as any, given its loading and voltage levels.
The other component clouding this issue is the original manufacturer's rating of 35W per channel. I never tested the amp for output power in its original configuration. A full restoration would have been required, and that wouldn't have been particularly useful once the transformers were transferred to the new chassis with a different topology. This admittedly opens areas of concern, but everything possible has been done to ensure the new design makes maximum use of the transformers. Rather, I believe the original rating was probably determined on the basis of "music power," and as such, would not have accounted for the power supply sag that occurs during continuous sine wave testing. I have a different 6L6 model from the same manufacturer that utilizes lower supply voltages and is rated 30W per channel. Based on the voltages, I suspect it only actually produces 25W or so. I'll test it in the near future, and if my suspicions are correct, the original power ratings will be rendered mostly meaningless. We'll see.
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- Tentative conclusions - Triode_Kingdom 09/18/2109:57:00 09/18/21 (0)
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