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Valve/tube heater wiring

Discussion in 'Electronic Repair' started by N Cook, Jul 18, 2007.

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  1. N Cook

    N Cook Guest

    Red and black wires to preamp and power amp tubes so presumably some
    significance although ac straight off the mains transformer.
    I marked the red lead but forgot to mark which post it was from before
    de-soldering. I cannot find any www pics of the power supply section of Vox
    AC30 CC1 recent variant, pointless hundreds of full frontal views though.
    The ECC83s are commoned heater to centre-tap , what if I chose the wrong
    "polarisation" , extra hum, nothing noticable, premature internal chemical
    effects or what ?
  2. N Cook

    N Cook Guest

    I can be pretty sure which way I've put it back because of the set in the
    thick wiring, almost as a loom.
    More intrigued what the significance , if any, if it was put back the
    "wrong" way.
  3. Meat Plow

    Meat Plow Guest

    My educated guess would be that nothing noticeable will occur especially
    if the sources is right off the mains transformer.
  4. AJ

    AJ Guest

    Agreed, probably a very low level hum noticable without any drive meduim
  5. Don Bowey

    Don Bowey Guest

    The full, and original, name is Thermionic Valve; the name is in very early
    writings regarding radio and thermionic current.

    I think a Brit shortened it to Valve, and someone in the colonies started
    calling it a Tube.

  6. Jamie

    Jamie Guest

    Hmm don't know how ever, I would like to know where at what point in
    history did tube amps become named as valves ?

    I've been around this circus for quite some time and the only names of
    electronics i've ever heard of that were slurred slang, came from those
    backyard mechanics, the midnight screw in buss fuse replacer with a
    penny etc..

    Back when CB was popular, I took a trip once to visit my relatives in
    another state. when I got there, I was asked if I could remove the tooth
    from their radio!. Now it took me a while to understand exactly what
    they were talking about but after listening in on some local traffic, I
    then understood the request.
    I guess the clipper circuit was what, they were referring too.

    Back then, little jobs like that were quickly done via a set of needle
    clippers and a large bill presented to them afterwards. They generally
    were happy if they could be heard generating harmonics in both
    directions many KChz away.
    Ok, good day.
  7. Eeyore

    Eeyore Guest

    What significance did you have in mind ?

    That'll teach you not to make notes !

  8. Eeyore

    Eeyore Guest

    There's a 50:50 chance it'll hum less if that helps.

  9. Eeyore

    Eeyore Guest

    At what point in history were they named by their shape instead of their function
    ? Typical Yanks.

  10. Jamie

    Jamie Guest

    Well, that's very educational.. Leave it up the brits to twist things
    Now I can understand thermionic valve description. We took that up in
    school years ago in science class where we made a tube via a mayonnaise
    lid with all the components on it and evacuated the jar. It was a very
    impressive project. Used material from various sources to make the
    heater, cathode, grid and plate that mounted on the lid.
    Of course, it didn't perform like a properly made tube but it did
    demonstrate activity of a triode when I was able to show that I
    could control current via the control grid.

    I do have an antique radio tech reference that is worth some money.
    Maybe i'll brush through that book and see what else has been twisted
    from the original electronic pioneers..

    Btw, if my education isn't failing me, I seem to remember that Edison
    was actually the first to discover the tube and didn't know it. His use
    of a plate to collect the shoot was in theory the plate in a tube.
  11. Jamie

    Jamie Guest

    Go eat your crumpets you fringing tea sucker..
  12. Eeyore

    Eeyore Guest

    I don't go anywhere near tea. It tastes of dead leaves.Yuk.

    The Chinese stuff made from flowers however is very nice.

  13. Jamie

    Jamie Guest

    if you like ingesting products grown in contaminated land
    fills. go ahead.

    We're getting our share of contaminated products here
    in the states.
  14. Eeyore

    Eeyore Guest

    I rather doubt they grow flowers for tea in contaminated landfill.

    Well ... 'you pays your money and takes your choice' as they say.

    Btw, the food / cuisine in China was *EXCELLENT* bar a steak I had. They need
    to work on beef. It was tough. If you ever find yourself in the Hong Kong /
    Shenzhen area you must try the seafood too. It's totally awesome. Possibly the
    best fish I've ever eaten.

  15. Meat Plow

    Meat Plow Guest

    Hey we call plenty of things valves her in Yank land. What do you Brits
    call a picture tube besides a CRT? A Picture Valve?
  16. Eeyore

    Eeyore Guest

    Go on ...... :)

    Seriously, the British name 'valve' described very well the action of a 'vacuum tube'.
    If you wanted to control the flow of something (electrons in this case) you'd use a
    'valve' to control it. For example the 'tap' on a hand basin is a water valve.

    As for the word 'tube', it describes the appearance quite well but little else.

  17. Meat Plow

    Meat Plow Guest

    I understand the valve terminology perfectly being a child of that
    technology. Now I'll have to go research if "toobs" were ever called
    "valves" here in yankland and if so just when and why did the split occur.
  18. msg

    msg Guest

    Meat Plow wrote:

    Please post your findings ;) From my fifteen minutes of web and usenet
    archive searching, I find nothing very helpful in this regard. If anyone
    has access to Proceedings of the IRE (or its predecessors?) from the
    early 1900s the references to thermionic devices may provide the U.S.


  19. Don Bowey

    Don Bowey Guest

    This one appears to be fairly complete:
  20. msg

    msg Guest

    A good overview of tube history, however the article takes pains to
    intermix the use of the terms 'tube' and 'valve' but does not
    explain the history of usage of these terms vis-a-vis the U.S. and

    IMO, this would make a very interesting thread if started afresh with
    a new subject heading and posted to appropriate NGs ;)


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