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Thread: Interesting (or just plain weird) Valves

  1. #1
    Join Date: May 2008

    Location: Lancaster(-ish), UK

    Posts: 16,962
    I'm ChrisB.

    Default Interesting (or just plain weird) Valves

    So, what valves have you got, or come across that are not like anything else you've ever seen?

    1538-P1 strobotron.
    A very small dome shaped 9-pin valve

    Pics & info here: http://www.tubecollector.org/1538-p1.htm

    A couple of years ago I sold 3 of these for a very pleasantly high price to a great gent in the States who had been trying for years to find some spares for his old machine.

    They're a very high speed flash device (high speed in the sense that the flash period is very short) used in a 'Strobotac' which is a piece of gear for measuring very high speed motion - (no bowel or toilet jokes please)

    http://www.tpub.com/neets/book16/67c.htm

  2. #2
    Join Date: Jan 2009

    Location: Essex

    Posts: 23,136
    I'm openingabottleofwine.

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    Quote Originally Posted by The Grand Wazoo View Post
    So, what valves have you got, or come across that are not like anything else you've ever seen?

    Pics & info here: http://www.tubecollector.org/1538-p1.htm
    After 30 years involvement in electronics research, I have come across and used many unusual 'valves'. These were not the devices that people usually think of as valves, rather they were photomultiplier tubes, microwave magnetrons and klystrons and devices used to measure very low pressure levels (that is, a vacuum). None of these, apart from the photomultipliers, looked like the glass devices that are mystically worshipped by some members.

    The web site you quote is very useful and interesting. I occasionaly use it inter alia for information on audio valves.

    Regards
    Barry

  3. #3
    Join Date: Feb 2008

    Location: North East UK

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    I'm InSpace.

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    Shian7
    --------------------------------------------------------

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    ari mizu-no tsuki

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    broken again - still it's there:
    the moon on the water.

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  4. #4
    Join Date: May 2008

    Location: Lancaster(-ish), UK

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    I'm ChrisB.


  5. #5
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Many years ago Fane made an ionic tweeter which had an incredible frequency response. Bowers and Wilkins used it in their P2 speaker. There was no arcing involved, so no light show!

    For their next loudspeaker B&W replaced the Fane unit with an electrostatic tweeter: the DM70.

    Barry

  6. #6
    Join Date: May 2008

    Location: Lancaster(-ish), UK

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    I'm ChrisB.

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    Yup, I smelled a pair of those Fanes once!!

    .....and I've always thought the DM70's were just great. It's a shame they've been overshadowed by the Quads because they really were special in their own way.
    Last edited by The Grand Wazoo; 21-05-2009 at 00:40.

  7. #7
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Quote Originally Posted by The Grand Wazoo View Post
    Yup, I smelled a pair of those Fanes once!!
    No doubt they would be banned today, what with health and safety and modern EU CE regulations.

    Regards
    Barry

  8. #8
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 98,500
    I'm AudioAl'sArbiterForPISHANTO.

    Default Crazy valves

    Calling Steve (SPS), Ali Tait, Steve the Shadow, etc, whaddya make of these babies (scroll down to the third picture):

    http://www.hififorum.nu/forum/topic....04&whichpage=5

    I presume they're triodes? Now I'd buy those puppies just to look at them!

    Does anyone know anything about them?

    Marco.
    "Count your age by friends, not years. Count your life by smiles, not tears” - John Lennon.

    "When the power of love overcomes the love of power, the world will know peace" - Jimi Hendrix.

    Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!

  9. #9
    Join Date: Jan 2009

    Location: Essex

    Posts: 23,136
    I'm openingabottleofwine.

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    Quote Originally Posted by Marco View Post
    Calling Steve (SPS), Ali Tait, Steve the Shadow, etc, whaddya make of these babies (scroll down to the third picture):

    http://www.hififorum.nu/forum/topic....04&whichpage=5

    I presume they're triodes? Now I'd buy those puppies just to look at them!

    Does anyone know anything about them?

    Marco.
    The amplifiers shown are single ended designs using Eimac 450TH directly heated transmitter triodes. They produce 160w.

    Single ended 160w amps! - better tell Ali (Tait). Downside? - none, apart from costing $55,000 a pair!

    Regards
    Barry

  10. #10
    Join Date: Mar 2008

    Location: Galashiels

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    I'm inthescottishmafia.

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    Fantastic aren't they? It's a DHT called the 450TH.Don't know much about them,but your probably looking at 100 or more watts single ended!

    EDIT-Found this- http://www.mif.pg.gda.pl/homepages/f...90/4/450TH.pdf

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