[R-390] Tube Sub Question

[Flowertime01 at wmconnect.com]

> From:    r390a at bellsouth.net (Tom Norris)
> To:    glowbugs at piobaire.mines.uidaho.edu
> CC:    R-390 at mailman.qth.net

I'm looking for a sub for the 6BJ6. Is there
anything out there in a remote or semi-remote
cutoff tube and 150 ma fil current??

Anyone have an extra dozen at less than Epay
prices?

Thanks

Tom NU4G

Tom,

The 6BJ6 is base diagram 7cm

Type                       Amp.    Cutoff
6AS6                       .175     Dual control
6BH6 / 6661             .15       sharp
6BJ6 /  6662             .15       remote
6BZ6                        .3         semiremote
6CB6 / 6676             .3         sharp
6CF6                       .3          sharp
6DC6                       .3          sharp
6DE6                       .3          sharp
6DK6                       .3          sharp
6EW6                      .4          sharp
6GM6                      .4          sharp
6JH6                       .3          semi remote
6JK6                       .35        sharp
7056                       .15         sharp

If you are running a string of series filaments and need the exact current to 
fit the string you have a very small range of choices. If you have a parallel 
filament you can use the .3 or .35 tubes. The extra .15 current draw will not 
kill the filament transformer.

These will all plug in with no problem. 
The grid bias point may be off and the tube may not work well.
You offer no B+ limit but if you are under 300 volts you will be OK.
If you inspect the exact wiring on the tube socket, several more tubes
may be used. Schematic may give a clue, but you need to look at the circuit. 
The Grid 3, Internal sheild and cathode may be wired such that tubes with 
other base diagrams may also work in your exact application.

Roger KC6TRU