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I'm not saying it can't work and I love the W5ms

In preamps,current is much lower of course.A 6hy could work just fine if you don't saturate the core by drawing excessive current and Heathkit was able to execute that circuit quite well.
There are a couple things at play here.One,Heath is using an opt trafo that is almost double the impedance of the typical 6L6/KT66 circuit.Most KT66/6L6 PP circuit work in the range of 6.6k.The 16309 trafo is like 11.9k and the 16448 is like 10.9k.The Heath choke is 150ma so that is adequate for that circuit.The circuit is also UL and all these things play a role in that wide bandwidth,low distortion circuit.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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  • I'm not saying it can't work and I love the W5ms - Michael Samra 12:35:46 05/23/17 (0)


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