And keep in mind
I make zero, zip, nada off tubes my customers purchase and drop ship to me.
So my statement is truly un biased.
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On 2024-05-18 13:11, W7WRX wrote:
The best appears to be from CTR engineering. There are two plants
that make 3-500 tubes in china. These are the best of the two. They
are fully Hi pot tested and guaranteed. Mine have been rock solid.
811A 572B 3-500Z Vacuum Tubes For Sale – CTR Engineering, Inc
(ctrengineeringinc.com) [1]
I have had very bad luck with Penta. Over and over failed or gassy
tubes out of the box. I ended up just getting a refund, They were
nice to deal with, no trouble. I was told they likely just got a bad
batch. Maybe they are better now. This was a year or two ago.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Joe - W7RKN via groups.io <w7rkn.7@...>
Sent: Saturday, May 18, 2024 9:52 AM
To: [email protected] <[email protected]>
Subject: [ham-amplifiers] 3-500 tubes
It appears I have a shorted 3-500Z tube in my AL-82 amplifier.
It also appears that right now the 3-500Z or ZG tubes are unobtainium.
Sellers on eBay are selling new Penta tubes for a ridiculous amount of
money.
Are Penta tubes any good?
Perhaps I should ask first, who has 3-500’s for sale?
I am going to replace the T/R relay in the amp while I have it
open….Been a weak component in the amplifier since it was new. Been
replaced twice now and the amp is only 4 years old.
A friend who is an amplifier guru is going to look into building an
external, plug in, relay setup for me. Then I could go to a vacuum
relay and my T/R relay issues would be over! Just to be on the safe
side, I just purchased 3 relays from Ameritron (MFJ) to have when they
are no longer doing business. If I do the relay modification, the
Ameritron relays should sell fairly quickly as it appears all their
high power amps use the same relay.
Thanks in advance, for any questions answered!
Joe – W7RKN
Links:
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[1]
[2] /g/ham-amplifiers/message/40383
[3] /mt/106173952/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
[6] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
