• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Found myself a Magnavox 9302-00

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lazzer408

lazzer408

Member
Joined 2010
800ma? I hope that's not at 12v.

If the capacitance of the 6SN7 is an ignorable "issue" then I'll just go with those.

Last question if you don't mind. I'm still a novice so there are many things I'm learning but how do I determine (ballpark) drive requirement of a particular output tube?
 
E

Eli Duttman

Member
Joined 2004
800ma? I hope that's not at 12v.
Click to expand...

No, that's at "6" V. The draw at "12" V. is 400 mA. The ECC99 pins out the same as the 12A_7 bunch and will operate on either "6" or "12" V. heater power.

The kind of "stones" the ECC99 has make sense if 300B DHTs or several multi-grid tubes in parallel are to be the "finals". The Miller capacitance is high, which is a "heavy lift". OTOH, the 6SN7 is more than capable enough to drive single multi-grid power O/P types set up in either ultralinear or full pentode mode. Even triode wired can be OK, with single tubes.
 
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