I recall reading somewhere that an automatic tuner should never be used
in front of bandpass filters and amps, too, as very high voltages can be
generated as the tuner spins its wheels.
FWIW, in 20 years, I once blew a cap in an ICE multiband bandpass
filter. ICE's customer service is fantastic and they sent out
replacement parts immediately (as they recently did, too, for a
telephone line surge suppressor that failed.) I also have Array
Solutions NQN filters about 5 years now and had one frying in it, early
in its history - also fixed per guarantee.
Barry, W2UP
Mario, S56A wrote:
W0UN: And at no time did any capacitors fail the 200 watt test -- or
even get very warm.
I guess you were lucky! I made W3NQN filters with a big VU mica caps
for 2 kV and they all failed on 7 MHz and above.
Manufacturer sent us new batch for free but they are not tested yet.
DL2NBU specifies VAR power ratings required.
Simple ICE filter configuration should survive most abuses but 21/28
MHz isolation is not good enough for SO2R.
Please note that BPF info is available in ON4UN book on low bands.
73 de Mario, S56A
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