I'm wondering if anyone can recommend a cheap dual pentode - not for hifi use, but experimenting with tube relaxation oscillators. The cheaper and funky-junkyer the better. Any heater voltage under 20 volts or so is fine, low plate voltage operation is a plus - maybe one of the automotive type tubes? Something used in tube type TVs? Any suggestions welcome!
6BN11, 6J11, 8CB11, 6BV11
The 6BV11 (also 6GY6, 6HZ6, 6AS6, 6DB6, 6DT6, 9KC6, 7AK7, 6888) has dual control grids on each pentode which could be used for a gain control.
The sorta dual pentode 6LE8 family includes 6BU8, 6KF8, 6MK8, 6GS8, 6HS8
There are also a bunch of dissimilar dual pentodes (compactrons) where one unit is a power pentode:
6AL11, 6G11, 6AF10, 8BM11, 9BJ11, 6AD10, 6BF11, 6BY11, 6T10, 6Y10, 12AE10, 13V10, 18AJ10,
or where one unit is semi-remote cutoff: 8BQ11, 6AR11
or really weird ones with a pentode + gated beam discriminator: 6J10, 6Z10, 17AB10, 17X10
The 6BV11 (also 6GY6, 6HZ6, 6AS6, 6DB6, 6DT6, 9KC6, 7AK7, 6888) has dual control grids on each pentode which could be used for a gain control.
The sorta dual pentode 6LE8 family includes 6BU8, 6KF8, 6MK8, 6GS8, 6HS8
There are also a bunch of dissimilar dual pentodes (compactrons) where one unit is a power pentode:
6AL11, 6G11, 6AF10, 8BM11, 9BJ11, 6AD10, 6BF11, 6BY11, 6T10, 6Y10, 12AE10, 13V10, 18AJ10,
or where one unit is semi-remote cutoff: 8BQ11, 6AR11
or really weird ones with a pentode + gated beam discriminator: 6J10, 6Z10, 17AB10, 17X10
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