Paul,
I am sure you will receive many answers to your question on this subject. I
will give you an answer that pertains to my experience with 572B's.
I have built many amplifiers over the years for people using this tube, only 3
last year and one so far this year. In my experience the Russian tube is by far
superior to what is available from the Chinese today regardless of the name or
label printed on them. In the past 10 years I have found that the Chinese tubes
have about a 40% failure rate new, out of the box here. So far I have had one
Svetlana tube fail to light out of about 50 that has been through my shop. The
Svetlana tubes last much longer and have much higher stage gain than any of the
Chinese tubes that I have tried. I have had very good luck purchasing these
tubes from Frank Krize, K5SVC at Krize Electronics. I am pretty sure that my
experience is not an exception but keep in mind that a fellow asked a simple
question about a fuse about 5 weeks ago and that lasted at least 3 weeks on
this forum venturing from a simple fuse question blossoming into fluid
induction breakers. There are a lot of people who don't co
nsider the 572B a worthwhile venture but for $150.00 for 3, they pretty much
equal the performance of a 3-500Z.
Best Regards,
Mitch
W4COX
----- Original Message -----
From: Paul Manuel
To: amps@contesting.com
Sent: Wednesday, January 19, 2011 8:11 AM
Subject: [Amps] 572Bs
Good morning. I'm a new list member and I've really learned a lot from the
archives. The knowledge is much appreciated.
Now a couple of questions...where do most of you buy quality 572Bs at a
reasonable price? What is the final concensus on Chinese vs Russian tubes?
Thanks!
73, Paul K4PDM
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