[Hammarlund] HQ-170 A smokin

[Robert Sauvan]

Hi all,
After I feel everything is going well, another radio decides to take a 
dive on me. My HQ-170A started getting a hissing/crackling sound minutes 
after turning it on. I decided to try to find the culprit. So I put it 
on the test bench, turned it on and it started smoking. I couldnt find 
the exact spot but it was in the area of the V7 tube socket. After 
turning it off and then on again to see if I could find where it was 
smoking from, it decided not to act up in that way anymore, but the S 
meter no longer climbs as it always did as it warmed up. Decided to do 
some resistance checks. I started at the V7 tube pins and found some 
really high resistances at pin 5 and 6.Pin 5 is supposed to have 8.5K 
and it has a 500K reading. Pin 6 is supposed to be 68K and it has 800K 
reading. All other pins on that tube look to be OK. Both of these pins 
have wiring going to the wafer switch.There are numerous caps in this 
wafer switch. What would I do to continue finding the possible bad part? 
Any ideas?

Any suggestions would be greatly appreciated.

Thanks-Bob-W0YBS