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    VTA Mk3 Octal Driver board mod to use 7193?

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    plexus

    Posts : 94
    Join date : 2012-02-18
    Location : Toronto, Canada

    VTA Mk3 Octal Driver board mod to use 7193?

    Post by plexus on Mon Apr 23, 2012 2:46 pm

    I was reading about the 7193: a single triode with G and A out to a top electrode for better HF characteristics (HF in the sense of RF). but some are saying its a great sounding audio tube. Since the VTA Octal driver board "wastes" a triode in the gain stage 6SN7, I was thinking modifying the board to use a 7193 might be a good idea: you'd not waste that 6SN7 triode and you'd get a better sounding result assuming the people who have switched to 7193's from 6SN7's in other amps they own are correct in that its a better sounding tube.

    I might get my hands on a couple and some tube electrode caps and try this out. the 7193 is electronically equivalent to the 6SN7 so it would just be a matter of rewiring the socket a bit. and since the VTA design does not use the other triode this seems like an easy upgrade.

    Thoughts?

    plexus

    Posts : 94
    Join date : 2012-02-18
    Location : Toronto, Canada

    Re: VTA Mk3 Octal Driver board mod to use 7193?

    Post by plexus on Tue Apr 24, 2012 4:29 pm

    I ordered some NOS 7193's and some electrode caps. I'll make the mods and let you know how it sounds. it will take a few weeks to get everything together. should be a fun project and from what I have read the 7193's sound a lot better than 6SN7's

    zx

    Posts : 194
    Join date : 2011-08-05

    Re: VTA Mk3 Octal Driver board mod to use 7193?

    Post by zx on Wed Apr 25, 2012 11:31 am

    Thanks For your info on the MK3s,in this post an others. I well ck on cost from my tube guy on the $$ of the 7193.I have been useing the 6SN7 for driver in tube amps for years vary hard to beat the sound.well to me.goodluck

    Thanks for the site Bob

    plexus

    Posts : 94
    Join date : 2012-02-18
    Location : Toronto, Canada

    Re: VTA Mk3 Octal Driver board mod to use 7193?

    Post by plexus on Wed Apr 25, 2012 12:36 pm

    I bought a few 7193's on ebay NOS US Navy 1943 for about $9 per tube including shipping. so they are pretty cost effective. I'll have to run a top electrode for both G and P but that won't be a problem. and of course mod the circuit board to work with the 7193. i'll post how it works out.

    gadzzuke

    Posts : 1
    Join date : 2012-08-08

    Re: VTA Mk3 Octal Driver board mod to use 7193?

    Post by gadzzuke on Wed Aug 08, 2012 6:57 pm

    Any progress on this project?
    I've had this thought previously as the tubes are CHEAP! And,as you've mentioned,supposedly sound great.
    Regards,
    Dan




    tubes4hifi
    Admin

    Posts : 1292
    Join date : 2008-11-30

    Re: VTA Mk3 Octal Driver board mod to use 7193?

    Post by tubes4hifi on Fri Aug 10, 2012 5:03 pm

    cheap tubes? for $9? there are dozens of 6SN7s on ebay for around a $1 each, even nice quads for $6, of course, all slightly used, but
    I'll take those over a new production tube any day. Anyone tried the russian 6H8C which runs $3-4 each?

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