Anyone of you tube guys shed any light on this

pitdogg2
pitdogg2 Posts: 25,450
edited November 2013 in Electronics
http://www.ebay.com/itm/141028718143?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Looking through 6AK5 tubes came across this one. Is it just a tube with a capacitor in it? If so why would they still chrome the top or whatever they do.

thanks
Post edited by pitdogg2 on
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  • [Deleted User]
    [Deleted User] Posts: 7,658
    edited November 2013
    There are quite a few tubes that have a connection on the top. The 811A is an example, four pins on the bottom and a cap on the top.
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  • pitdogg2
    pitdogg2 Posts: 25,450
    edited November 2013
    Kenneth Swauger wrote: »
    There are quite a few tubes that have a connection on the top. The 811A is an example, four pins on the bottom and a cap on the top.

    Yep I have seen those tubes that also connect at the top. Never knew that was the case with the EF95 6ak5 stuff. So it is safe to say it not a tube buffer tube:lol: Wonder what they were used in?
    thanks for the info Ken
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    With a cap it should be connected to high voltage lead, never seen a tube with one and not connected to a wire.

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  • [Deleted User]
    [Deleted User] Posts: 7,658
    edited November 2013
    The 811A in the Altec 1570B has 935 Volts on the plate connection (the end cap).
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  • mhardy6647
    mhardy6647 Posts: 33,806
    edited November 2013
    As has been noted above :-) High voltage plates (e.g., in color TV high-voltage sections or linear RF amplifiers... or high-power AF triodes) operating at frighteningly high plate voltages, the top (or side) of envelope plate caps were often used.

    In some early (mostly radio) tubes, the top connector might be for a grid instead of a plate.
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    Kenneth Swauger wrote: »
    The 811A in the Altec 1570B has 935 Volts on the plate connection (the end cap).

    935v will bite you :wink:

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
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    Electronics
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    Pioneer 84TXSi AVR
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    WMC Win7 32bit HD DVR


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  • mhardy6647
    mhardy6647 Posts: 33,806
    edited November 2013
    only once.
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    Twice if really stupid!

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR


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  • SCompRacer
    SCompRacer Posts: 8,500
    edited November 2013
    McAlister used 40KG6 horizontal output TV tubes in his amps once upon a time. I had one. A homely home built look but it sounded good.

    attachment.php?attachmentid=11408&d=1128739244
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    Old TV horizontal output tubes Kooooolll I think a tube like that could output 20w or so.

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR


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  • mhardy6647
    mhardy6647 Posts: 33,806
    edited November 2013
    disneyjoe7 wrote: »
    Old TV horizontal output tubes Kooooolll I think a tube like that could output 20w or so.

    Lots more than that run in class AB push-pull (or push pull parallel); they were - and still are - widely used in RF linear amplifiers for amateur radio (not to mention outlaw CB "heaters") as a (relatively) cheap source of moderately high output power.

    My favorite application of horizontal sweep tubes in audio is probably the McIntosh MC-3500 monoblock amplifier...

    MC3500inside.jpg


    Eight 6LQ6 (6JE6) sweep tubes PPP for 350 watts :-)
    As far as the plate caps go: If <touch>, then <die>.
    http://www.roger-russell.com/amplif2.htm#mc3500
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    Nice and like the fan in the back also.

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR


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  • mhardy6647
    mhardy6647 Posts: 33,806
    edited November 2013
    I suspect it needs the fan ;-)
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  • pitdogg2
    pitdogg2 Posts: 25,450
    edited November 2013
    SCompRacer wrote: »
    McAlister used 40KG6 horizontal output TV tubes in his amps once upon a time. I had one. A homely home built look but it sounded good.

    attachment.php?attachmentid=11408&d=1128739244
    disneyjoe7 wrote: »
    Old TV horizontal output tubes Kooooolll I think a tube like that could output 20w or so.
    mhardy6647 wrote: »
    Lots more than that run in class AB push-pull (or push pull parallel); they were - and still are - widely used in RF linear amplifiers for amateur radio (not to mention outlaw CB "heaters") as a (relatively) cheap source of moderately high output power.

    My favorite application of horizontal sweep tubes in audio is probably the McIntosh MC-3500 monoblock amplifier...

    MC3500inside.jpg


    Eight 6LQ6 (6JE6) sweep tubes PPP for 350 watts :-)
    As far as the plate caps go: If <touch>, then <die>.
    http://www.roger-russell.com/amplif2.htm#mc3500

    very very cool guys pleasing eyeball **** to say the least...
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  • mhardy6647
    mhardy6647 Posts: 33,806
    edited November 2013
    I'm not generally a big fan of high power... but I've gotta admit that I would take a certain amount of perverse pride in owning a pair of those Mac MC-3500 monoblocks if the opportunity ever presented itself ;-)
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  • pitdogg2
    pitdogg2 Posts: 25,450
    edited November 2013
    mhardy6647 wrote: »
    I'm not generally a big fan of high power... but I've gotta admit that I would take a certain amount of perverse pride in owning a pair of those Mac MC-3500 monoblocks if the opportunity ever presented itself ;-)

    you'd be a fool not to....well unless you're out of donatible body parts.
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  • megasat16
    megasat16 Posts: 3,521
    edited November 2013
    mhardy6647 wrote: »
    I'm not generally a big fan of high power... but I've gotta admit that I would take a certain amount of perverse pride in owning a pair of those Mac MC-3500 monoblocks if the opportunity ever presented itself ;-)

    You can have the same version of MC-3500 in industrialized version called MI-350 for nearly 20K. This is big time out of my league but I think if I need that much tube power, there are better and cheaper way these days.

    http://www.ebay.com/itm/McIntosh-Mi350-mono-tube-amplifiers-/271328120765?pt=Vintage_Electronics_R2&hash=item3f2c6a8fbd
    Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited November 2013
    So who's driving to CAL?

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    WMC Win7 32bit HD DVR


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  • pitdogg2
    pitdogg2 Posts: 25,450
    edited November 2013
    The only one who could afford all the gas Sal:lol:
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