[HAM] Relay problem?

[Brad Baker]

On 9/16/06, Luther Nallie <lnallie at yahoo.com> wrote:

> Thanks for the tip.  I tried switching the 12AU7's and not any difference.  It
> seems to switch for a minute or so when it first comes on but then it takes a
> couple of bumps of the switch to slow down (as it did before).  There is no
> problem going from slow to fast, just one flip every time.

Measure the DC voltage to ground across R12,  That's the large
sand-filled 150 ohm power resistor that sticks up through the hole in
the chassis.  It should read around 25V.  In old amps, leaky coupling
and other capacitors can cause this voltage to rise (also output tubes
start glowing).  I've seen this cause intermittent relay switching.

-- 
---  b r a d  b a k e r  ---\\