[Heathkit] Screen dropping resistors (was DX-100B on Phone - bad audio distortion /oscillation)

[Ron Youvan]

   Rick WA1RKT Poole wrote:

> As noted above, this is opposite from what I'm seeing... key-up (no
> drive), the screen voltage is higher than key down.  Maybe the clamp
> circuit isn't working, although as I said, the clamp control works as
> described in the manual.

> I'm pretty sure I checked the 6AQ5 clamp tube in the tester and it
> checked good, but I'll do it again after it cools off a bit.  :-)

   The clamp tube may be conducting the same with no drive as the tubes do with drive.
It is a clever design that protects the tubes that operate at the maximum output power while 
protecting them under no drive conditions.
-- 
    Ron  KA4INM -    Ron  KA4INM - Did you know ...
                     ... that no-one ever reads these things?