[AMRadio] Valiant PI net caps

[ne1s at securespeed.us]

> Good day, I have 2 Valiant transmitters on my bench now with leaky tank
> caps, especially the 300 mmf one. The octagon one with 3 caps in it are
> some what okay but suspect. There is another Valiant that is waiting for
> some also. Now I am wondering where I may get some of these for
> replacement. I tried RF Parts with no luck. I tried regular ceramic caps
> and they failed soon so I tried snubber caps at 2KV and they failed also.
> Where may I look and for what?

I used 4 snubber caps (the large silver micas) in series-parallel to
replace each of the postage-stamp micas used as padders for 160M and 80M
(IIRC) on the high-impedance side of the pi-net output in a friend's
(KB1IAW) Valiant. In addition to the RF voltage across them, there is
significant RF current flowing in these caps, so paralleling them helps
out there.

That transmitter has seen a lot of use on those bands since I did that
work at least five years ago, and there has not been a failure.

73/GL,
-Larry/NE1S