[R-390] 2nd Crystal Oscillator question

[email protected] [email protected]
Mon, 10 Feb 2003 14:39:05 -0600


The levels I measure now at E402 are about half of what you 
should see (-2.5V to -5V should be -4V to -11V) with a good 
VTVM. The cathode measures 0.9V should be 2V. I replaced 
the 6AK5 with a better one, all the caps check good on value 
and leakage, the cathode RF choke measures 0.5mH, the 120K grid 
resistor is OK, B+ levels are OK, replaced the 12pf and 150pf 
capacitors anyway (with 10pf and 130pf), replaced one crystal 
to see what happens .....levels got a little better (to the above 
-2.5V to -5V).

Any suggestions ?

73 Kees K5BCQ