>
>Henry radio runs the filaments in their amplifiers with the filaments in
>series. There is no center tap on their filament transformers.
>They use a small choke hooked to the "center" of the 2 tubes. They insert
>the drive power from the tuned input circuit at this same point. The choke
>is for rf isolation. Works great!
>
Indeed, Jim, and there is no audible hum. Kenwood's
TL-922 does the same.
- Rich..., 805.386.3734, www.vcnet.com/measures.
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