[Heath] SB-610 monitor scope technical assist

[Dick KF4NS]

Hi Guys,
First I will give you a short history. I bought  it used in Dec. 2002 and immediately replaced the CRT 
with the flat screen 3RP1, and the HV caps, diodes and resistors as well as the 600v supply caps. Since 
then, replaced several high value resistors out of tolerance. Transformer secondary voltages are right 
on.

I have not replaced the can caps yet but will soon because voltages are low.

The trouble is with the vertical amp,  V2 tests fine. It has had very low gain from the beginning.  All 
resistors are new in vert. circuit and caps test good now. It is set up for 3395khz and has the correct 
caps. There is no loss between the rear vert. IN jack and the wiper terminal of vert. gain pot. After 
that I lose 300mv at the control grid with 500mv (rms spec for 3395) at 3395khz unmodulated injected from 
my sig gen to the IN jack and read at the control grid with my TEK scope, The 2700ohm grid resistor is 
new. Vertical pot is good and set for max. No sense in testing the CRT voltages until all the 
electrolytics are replaced.
I tried tweaking the slug for L1 and see no change at the grid. QUESTION: are the input/output tuned 
circuits similar to the TPTG circuits for oscillators? There is no mention of test procedures for the 
tuned circuits or the values for the coils.

I am sure I have left something out so please excuse me and tell me what is missing. Oh, yes, I don't get 
the 5Mohm at lug 2 strip B, actually it is only a bit more than 2Mohm. Followed the troubleshooting guide 
to no avail.

Any advice will be greatly appreciated.
Thanks and 73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!