This Design Idea is a reprint of an earlier one that contained errors in graphics (Reference 1). Even though 6L6 beam-power tubes have been around for 66 years, they are still quite popular for use in ...

Pentode and Triode tube models. Parallel saturation with two AX7 models. Air provides gorgeous lift . Sounds stunning on busses and tracks. To mark Plugin Week, here’s our pick of the most out-there ...

Ron Quan, analog aficionado and inventor of the dreaded MacroVision VHS content scrambling system, saw my blog about a radio that uses Russian rod tubes. I saw Ron Saturday at the last eFlea of the ...

A 8-pin plastic base with oval glass envelope. Stamped: “Tung-Sol / WE 717A”. Donor’s card reads: “Pentode made by Tung-Sol Electric Company for the US government during World War II. A high frequency ...