[Central-Electronics] 6550 Finals

[JM/CO]

Over the past several years, I have had the opportunity to "interview"
various brands of this tube, and IMHO, the absolute, hands down, no contest,
best 6550 is the Tung-Sol. These were  installed as original equipment in
100-V transmitters. True, these are a bit pricey NOS now, but they are not
hard to find. They were used in many applications, including pass tubes in
HV power supplies.  I have NOT used the Svetlana tubes, but my experience
with Russian tubes in general has been very favorable. Stay away from
Chinese tubes. Probably in a few years, their quality  will be on a par with
all the others, but they are not there yet.
Chuck N1LNH
----- Original Message -----
From: "Jim DiMauro" <jfd@warwick.net>
To: "Central Electronics" <central-electronics@mailman.qth.net>
Sent: Sunday, April 20, 2003 9:36 PM
Subject: [Central-Electronics] 6550 Finals


> Hi All:
>
> The finals in my 100V are a bit soft; not bad enough to replace
immediately,
> but I want to buy a spare set.  I'm interested in your experinces with
> various tube brands, particularly the Svetlana 6550C's.  What about
6550A's?
> Any particular types/brands to avoid?  I'm not going to spring for $100+
per
> tube for NOS American made 6550s, unless the consensus is that's the only
> thing that'll work.
>
> 73,
> Jim
> WA2MER
>
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