[R-390] R-390A toal current drain ?

[Shoppa, Tim]

OZ1UF writes:
> 3rd: I removed both 6AK6 AF output tubes . The choke warms up to a
> much more moderate degree. The two 6AK6s run quite warm/hot when in
> operation. And since there is more AF output available then I will
> ever need, I intend to reduce SG voltage by increasing value of the
> SG series resistors or just solid-state the audio stage(s).

Audio output tubes running too hot is almost always caused by either
Gassy tubes, or leaky capacitors putting DC on the tube grid.

The two 6AK6's should have 0V DC on their grids. If not, they
May be gassy, or likely the capacitor driving their grids may be leaky.
C605 and C608, 0.01uF capacitors.

Recapping the audio deck is quite easy, lots of room to work, lots
Of the parts on the turret board. Leakage through the multitude
Of bypass caps in the rig could itself be warming things up too much.

6AK6 plate current should be like 15 or 20 mA each.

Tim N3QE