Reseat the tubes several times and be sure the anode contact hasnt come
apart.....a common failure.
Carl
----- Original Message -----
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Friday, April 19, 2019 7:55 PM
Subject: [Amps] Why 2 3CX800s instead of one 8877?
I have been using a 76A for many years along with several other amps.
I decided I had more amps than I needed even running SO2R with backups so
the 76A went up for sale. I had an immediate buyer, but as the 76 had set
for a few months. I told him I wanted to run it through its paces before
he made the long drive to pick it up.
You guessed it. Half power! I had used that amp for well over a decade
with nary a hiccup. I go to sell it and one one of those tubes fails. One
of those tubes, new costs more than the amp is worth. Now I happen to have
a stash of tubes that I could modify it to use.
I would prefer to do the mod neatly, complete with a proper transformer
rather than a filament transformer mounted on the back. Yes, I realize the
cost.
A single 3CX800 would give me what I had (it's a two hole), but going with
the cost of the transformer, I might as well go with a pair of 3CX800s, or
a single 8877. If I do the conversion to legal limit, I will have as much,
or more into the amp than what I can get out of it, so I'll probably keep
it and sell my Quadra.
Of course the third option is to just sell the 76 as is.
Other than the replacement cost and availability, Is there a reason for
not using a single 8877 Vs a pair of 3CX800s? Using new tubes the 8877
would have been the economical choice, but I understand that the prices
have gone up. Tube prices for legal limit amps are beginning to make the
new SS legal limit amps look better all the time.
I also have a completely restored HT33B (Sans 2 panel screws) with a
ceramic 8295A and 3 spare ceramic 8295As . Last time I used it it had full
power, but that was prior to 1997
73, Roger (K8RI)
--
Roger (K8RI)
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