8156 Beam Pentode Compactron - Page 2 - diyAudio
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Old 19th January 2012, 03:35 AM   #11
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Looks about like a 6L6, except it'll keep on working up to 175MHz+ (better than 807). Transconductance I think is a little higher, so alter the bias accordingly. It should do well in 6L6 non-GC (i.e., the lower dissipation models, G, GA, etc.) circuits with little adjustment.

The screen isn't too impressive, I have some similarly sized sweeps (compactron, same bulb, 15 or 20W plate dissipation; not nearly as low inductance connections to the cathode or plate though!) which claim 3W or so. Sweeps of course were built for abuse; this tube was made for the somewhat more gentle environment of a more-or-less well-adjusted radio.

Tim
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Old 19th January 2012, 12:14 PM   #12
roline is offline roline  United States
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You should be able to get 20-25 watts/channel in PP mode with them. I used 6JN6 Compactrons in a little amp with 6U10's on the input driving them. 180 v on the screens to keep them happy. They sound great in triode mode.
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Old 23rd January 2012, 04:27 AM   #13
w5jag is offline w5jag  United States
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Isn't 8156 just a 2E26 in a compactron bottle? 7984 is an improved 6146 type in a compactron bottle.

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