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Thread: AVO Two Panel Tester

  1. #21
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    It is showing variance between 211 performance well after testing quite a few more.

    Top job.

  2. #22
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Excellent, i rather hoped it would after studying the valve curves.

  3. #23
    Join Date: Nov 2014

    Location: Leicestershire

    Posts: 317
    I'm Mark.

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    Quote Originally Posted by User211 View Post
    Now aptly named...
    Ha - cool Perid Dymo Tape too!!!

    Sent from my G8441 using Tapatalk

  4. #24
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Talking of periods I thought my collection of Amperex 211s were 1950s but some are dated stamped 1940 on the base in small print.

    Why I didn't see that before I don't know. They are US made for the US Army.

    The wife bought the Dymo recently. Surprised they are still made TBH.

  5. #25
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Seems to work rectifier testing, too, Alan.

    Tested three Chatham's. 20mA is NOS. FSD on the meter is 100mA in recti testing mode.

    Tested my entire 211 collection yesterday. What really surprised me is the Amperex I have actually been using for years tested the strongest.

    Found two lemons but I can put together very good quads of GE, Amperex and RCA.

    Satisfying. Thanks again Alan.
    Last edited by User211; 19-10-2019 at 17:53.

  6. #26
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    I can definitely state that some eBay valve sellers are lying through their teeth with claims about how well the valves they are selling test.

    It isn't a prolific problem. But it is there. It's a 5 or 10% problem at most. But be very careful if you are spending a lot of money without a tester.

    That said some brand new valves could measure better.

    Some really old triodes can take about 5 to 10 minutes before they provide a stable output. Curious. But once settled they are fine.

  7. #27
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Anyone know how to test a dual triode with a quoted mA/V figure greater than the 10 mA/V full scale deflection value the meter allows?

    Is there a trick or is it basically not possible?

    It IS possible to set it up so FSD represents 1mA/V. Not useful in this case.

    E88CC is quoted as 13 mA/V in the data manual, which is the valve in question.

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