[Hallicrafters] Ht-30 ceramic tub caps

[Robert Sauvan]

Hi all,
Im trying to troubleshoot a problem that I have actually had since 
getting and working on restoring my HT-30. It works great but I lose 
power after a while of operating on 20 meters only. I seem to be able to 
fix the problem for a bit by just rotating the bandswitch to the other 
bands and when I get back to the 20 meter band it seems to operate OK 
for a while again. One would just assume it is a dirty bandswitch but I 
have cleaned the thing a thousand times and it shines. So, Im going to 
cancel that as my problem. Im thinking something is breaking down and 
the time it takes for me to switch through the bands and let it sit for 
a minute, it recovers. According to the manual, the 20 meter issues are 
around the 12AT7 tube and associated circuitry. This is where it brings 
me to the tub capacitors. All of the caps related to this circuit are 
tub caps. The manual does not refer to any voltages for these caps. Im 
thinking about picking up some "orange dips" with 630 volt rating. Will 
these work to replace the tub caps in this radio? Is there a way to 
check any of these caps in the circuit to possibly track down my problem?

Thanks-Bob-W0YBS