Calling: Mike McCue, tube help?

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newfuturevintage
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2008/10/09 15:32:10 (permalink)

Calling: Mike McCue, tube help?

Hi Mike--

Hope it's not too much trouble to ask, but you're our resident tube data sheet expert here, and my google searches are letting me know my ignorance more than anything else . They spec similarly in a lot of areas; I just don't know how much play in the specs is significant.

So I've got an Ampeg Rocket 2 with a microphonic, discontinued, rare 7199 tube. (going for $40-$50 now). Have found a site that claims 6u8 tubes (~$6-10) to be acceptable substitutes (with a little socket rewiring), and I wanted to ask you your opinion on the matter.

Many thanks,

nfv

My inner child is an angry drunk.
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    The Maillard Reaction
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    . 2008/10/09 16:34:45 (permalink)
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    post edited by Splat Chat O'samplemashy - 2018/12/21 16:44:30


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    ew
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    RE: Calling: Mike McCue, tube help? 2008/10/09 17:55:57 (permalink)
    Frank Van Alstine used to keep 7199s around (they were also used in Dynaco stereo amps)- he doesn't have them listed on his site but you could try writing him. I've bought a few 7199s from him over the years:

    http://www.avahifi.com

    The 7199 was usually used as a driver tube. I've also heard from a couple reliable sources that 12AX/AUs can be used with a little rewiring of the sockets.

    ew
    post edited by ew - 2008/10/09 18:00:23
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    The Maillard Reaction
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    . 2008/10/09 18:06:49 (permalink)
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    post edited by Splat Chat O'samplemashy - 2018/12/21 16:44:43


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    PerChr
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    RE: Calling: Mike McCue, tube help? 2008/10/09 18:43:07 (permalink)
    Hi,

    here are some 7199 tubes alternatives : http://thetubestore.com/7199types.html

    The Sovtek 7199 is only $19.95

    Per
    post edited by PerChr - 2008/10/09 18:46:57
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    newfuturevintage
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    RE: Calling: Mike McCue, tube help? 2008/10/10 12:37:05 (permalink)

    ORIGINAL: PerChr
    The Sovtek 7199 is only $19.95

    Per



    Thanks, Per...unfortunately, the Sovtek's were discontinued a while back, and I couldn't find anybody with them in stock.

    Mike- thanks for the reply, and sorry for calling you out by name (I just knew you'd have a reliable opinion on the matter).

    As for the wiring diagram, it's pretty easy. It's three wires to swap to get the pinout from one tube to the other.
    http://site.tubedepot.com/7199_6u8.pdf
    Also very easy to get at the pins: the Rocket2 is point to point wired with a ton of room in there. Probably worth it for me to make the swap in the long run. I'm already needing to replace the opto unit in there so it'll be open already.

    Those old Ampegs certainly used tubes that did not become the common models.


    Oh yeah. This amp uses 7591's for the output section. Super easy to get now, but I had to replace them a few years before they were reissued. Ungh. Expensive, hard to find. But totally worth it. This amp rocks.

    The 7199 was usually used as a driver tube.

    Thanks, ew. Yes, the 7199 is a driver in this amp. Really simple amp actually: 12ax7 for pre / EQ, 7199 driver, 7591's in the output section. Solid state rectifier. That's it.

    My inner child is an angry drunk.
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