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Re: [Amps] Amp output power

Subject: Re: [Amps] Amp output power
From: "Roger (K8RI)" <>
Date: Fri, 28 Aug 2015 05:36:07 -0400
List-post: <">>

The PL172/8295As were notorious for going gassy with no use. I still have 4 of the 8295A ceramic versions, one of which is in a restored HT33B.

I in addition to the 8877s and 3CX800s, I like the FU728F Chinese Tetrode. New version only. Older ones/NOS suffered a high infant mortality rate.. I think they are close to the price of the 8877. Great tube, but more complicated amplifier build. It seems that many have forgotten how to tune Tetrodes. The 8877 is nice and compact.


Roger  (K8RI)

On 8/25/2015 1:13 PM, Mike Feher wrote:
Bill -

How about a pair of 4-400As as I have 10 NOS ones in original boxes. It is
also used in my T-368F and does a nice job there. I also have a bunch of
PL-172s or 8295s and a pair of those would make a real nice amp. I used to
have an HT-33B that used one of those, and stock it easily put out 1.2KW key
down.73 - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731

-----Original Message-----
From: Amps [] On Behalf Of Bill Turner
Sent: Tuesday, August 25, 2015 12:35 PM
To: Amps group
Subject: Re: [Amps] Amp output power

------------ ORIGINAL MESSAGE ------------(may be snipped)

On Tue, 25 Aug 2015 08:51:40 -0400, you wrote:

I think I've seen, new imported 8877s of reported good quality for the
price of two tested, 3CX800 pulls.


Roger (K8RI)

I paid just over $500 for a Pride brand (Chinese) 8877 about four years ago
and it now has hundreds of hours of RTTY contesting on it and still has full
output. It did arc once when it was a few weeks old and blew the AC line
fuses. I replaced the fuses, found no other damage, and it has been perfect
ever since.

I see that Alpha has gone to a single 8877 in their top of the line
9500 amplifier.

IMO, the best tubes, everything considered, for an amateur amplifier are
either a single 8877 or a pair of 3-500Z's.  Opinions will vary of course,
but for cost, availability and effectiveness either of those is hard to

73, Bill W6WRT
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