New DIY Tube Amp!

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zingo
zingo Posts: 11,258
edited November 2008 in DIY, Mods & Tweaks
I've started designing a new tube amp that uses the Eimac 4CX20000A. It's a ceramic/metal power tetrode tube that could produce enormous amounts of power in a class A configuration. If you read through the specs, you might see a few of the design issues I'm running into; the least of which is the requirement of forced induction cooling... :p

4cx20000asm.jpg
Jake
Post edited by zingo on
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  • ben62670
    ben62670 Posts: 15,969
    edited November 2008
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    Well it's the right time of year:)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • ShinAce
    ShinAce Posts: 1,194
    edited November 2008
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    Induction cooling?

    Nevermind, started reading and realized the tube needs forced air cooling. Convection, not induction.
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  • Systems
    Systems Posts: 14,873
    edited November 2008
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    Plate voltage 7.8k DC .:eek:
    Testing
    Testing
    Testing
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  • zingo
    zingo Posts: 11,258
    edited November 2008
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    GV#27 wrote: »
    Plate voltage 7.8k DC .:eek:

    Now your starting to get it... :D
    Jake
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  • Polksaladanni
    Polksaladanni Posts: 208
    edited November 2008
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    Audio Frequency Voltage=10Kv? Max Temp=250c?

    Maybe you can heat the house with it. ;^)

    Or start your own national radio station?

    Or a laser to shoot ICBM's out of the sky?

    Good Luck and warn us before flippin the power switch on. JK

    Paul

    Ceramic metal, oxide, silicone R's seems to becoming a trend in vac amps.
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  • sucks2beme
    sucks2beme Posts: 5,560
    edited November 2008
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    Damn. Looks like what we used to use for vhf/uhf transmitters.
    You won't be able to hear over the cooling fans.:confused:
    "The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." --Thomas Jefferson
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  • TNRabbit
    TNRabbit Posts: 2,168
    edited November 2008
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    sucks2beme wrote: »
    Damn. Looks like what we used to use for vhf/uhf transmitters.
    You won't be able to hear over the cooling fans.:confused:

    That's not a problem; simply wire it into your garage & run I/Cs & speaker cables from there into the house! That way, you can take advantage of the winter cold to help with the heat issue....

    Hell, hook up a 48" fan in the attic & draw it all through a 6" tube & you could have some hellacious airspeeds flowing over those babies....

    :D
    TNRabbit
    NO Polk Audio Equipment :eek:
    Sunfire TG-IV
    Ashly 1001 Active Crossover
    Rane PEQ-15 Parametric Equalizers x 2
    Sunfire Cinema Grand Signature Seven
    Carver AL-III Speakers
    Klipsch RT-12d Subwoofer
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  • zingo
    zingo Posts: 11,258
    edited November 2008
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    It has a current draw of 140A max at full voltage! And the voltage is so high in the tube that when it arcs, it creates X-Rays; could be a problem I guess...
    Jake
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  • Systems
    Systems Posts: 14,873
    edited November 2008
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    zingo wrote: »
    It has a current draw of 140A max at full voltage! And the voltage is so high in the tube that when it arcs, it creates X-Rays; could be a problem I guess...
    If you have a million $ R&D budget you might be able to come up with something usable.;)It's not quite plug and play like an EL34 or 6L6.:D
    Testing
    Testing
    Testing
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  • mhardy6647
    mhardy6647 Posts: 33,092
    edited November 2008
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    zingo wrote: »
    It has a current draw of 140A max at full voltage! And the voltage is so high in the tube that when it arcs, it creates X-Rays; could be a problem I guess...

    When life gives you lemons, make lemonade.

    Think of the benefits! You can do your own radiology; save on all those copays when the kids break an ankle or wrist!
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  • zingo
    zingo Posts: 11,258
    edited November 2008
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    GV#27 wrote: »
    It's not quite plug and play like an EL34 or 6L6.:D

    Eh, child's play. :rolleyes:


    The anode is rated for 20kW of dissipation. :eek:
    Jake
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  • MillerLiteScott
    MillerLiteScott Posts: 2,561
    edited November 2008
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    Where is the energy star sticker:confused:
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D
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  • megasat16
    megasat16 Posts: 3,521
    edited November 2008
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    Free Chest X-Ray, anyone? :D
    Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
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  • zingo
    zingo Posts: 11,258
    edited November 2008
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    megasat16 wrote: »
    Free Chest X-Ray, anyone? :D

    Screw your chest! How about contently being bombarded by ionizing radiation while in your listening room! :D Makes me feel warm all over...
    Jake
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  • BT1000
    BT1000 Posts: 3
    edited November 2008
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    Hey, Jake. If the project doesn't work out, you can put that baby on 20 meters...hi. Either way, you will have to push a lot of air through that baby. That will be noisey. Put the amp in the garage in the summer and inside for winter. It will heat up your listening area nicely:)

    Bill K1XT
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  • sucks2beme
    sucks2beme Posts: 5,560
    edited November 2008
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    What's next, a klystron?
    Maybe a mag-amp?
    "The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." --Thomas Jefferson
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