Perhaps it is NOT the 'blocking' cap, but the 'loading' cap that is
switched in on 80m. If it is not of sufficient capacitance, the amp
won't tune/load.
73
Don
N8DE
Quoting Dick NY1E <dick@ny1e.com>:
I finally got around to digging out another blocking
cap, unfortunately, same results. It draws more current with more
drive, but plate and load controls have no effect on plate current,
grid current remains low....
--- On Sun, 1/27/13, Bob Alexander <realex2@verizon.net> wrote:
From: Bob Alexander <realex2@verizon.net>
Subject: Re: [Amps] 8877 won't load on 80M
To: dick@ny1e.com
Date: Sunday, January 27, 2013, 8:19 PM
On 1/26/2013 5:18 PM, Dick NY1E wrote:
I have a homebrew 8877 that has been working fine for 12 years on
160 and 40 thru 10, but I never had an 80M antenna. I finally got
one up and the amp wont load on 80. It is stable, draws full
current, but puts out less than the input, I've played around
adding and removing padders to the plate and load caps. There is no
tuned input.Any ideas???Thanks, Dick NY1E
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Hi Dick,
I have experienced this same problem two times over the years. Once
with a homebrew 8877 and once on a SB220.
The plate blocking capacitor is open on 80 meters. Sounds weird but
it really does happen.
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