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RE: Harman Kardon TA5000X output transformers

The part numbers would be different regardless of impedance; A500 transformers are horizontal mount. In any event, TA5000 OPTs are almost certainly 4K P-P or less. I've measured the A500 transformers, and they're 3.6K P-P. [EDIT: I remeasured these same transformers years later using different test gear and a more refined procedure. The examples I have are in fact about 5K.] HK's TA-260 also used 7355s, and Sams shows the transformers to be 4K P-P. Unfortunately, these low Z OPTs aren't optimum for use with most triodes.

I experimented with an A500 last year, substituting 6L6-family tubes for the 7355s. Results were very good, and I'm planning to eventually use the A500 iron (including the power transformer) to build a new amp. My suggestion would be for you to consider doing the same. I'm a fan of big triodes, but good pentode amps (non-UL) can also be a real joy to hear.

Ken-Rad 6L6 Specs:






Edits: 02/25/24
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