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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


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rwferr
Roy Mottram
baddog1946
Bob Latino
mantha3
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    12at7 Mullard tubes

    mantha3
    mantha3
    mantha3


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    • Post n°1

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    Post by mantha3 Sat Dec 03, 2011 11:17 am

    Yo!

    I love the sound of the Mullard 12at7s!

    Looking to get another single tube for me.. My brother has drawn me for the Christmas Gift Exchange and the price is 30 bucks.. Just about right for a CV4024 or some other spec Mullard 12AT7.

    Where are people getting the Mullards these days? Bob, do you still have a stash of CV4024's for sale?

    Good to see this forum still active!

    C Ya!
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    Bob Latino
    Bob Latino
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    • Post n°2

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    Post by Bob Latino Sat Dec 03, 2011 3:59 pm

    Hi Andrew,

    The Mullard CV4024 is an excellent sounding 12AT7 equivalent tube. They are also usually dead reliable and quiet. They are smooth sounding yet have good extenstion top and bottom. The smoothness of this tube does not sacrifice accuracy IMHO. They are my favorite driver tube in the VTA ST-70 and ST-120 amp kits.

    They are also available and their pricing (about $30 a tube) is not too high. I use three in my own ST-120 although the center tube is the one the most affects the sound. If you want a good one for the center position, contact Jim McShane and get a low noise tube with balanced triode sections for the CENTER CV4024/12AT7. It will cost a little more than $30 but IMHO it's worth it.

    I (unfortunately) have sold all the extra CV4024's that I had ...

    Bob
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    baddog1946
    baddog1946
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    Location : Costa Rica
    • Post n°3

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    Post by baddog1946 Sat Dec 03, 2011 10:12 pm

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    Roy Mottram
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    • Post n°4

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    Post by Roy Mottram Mon Dec 05, 2011 11:52 pm

    also on sale here for $30 each http://tubedepot.com/12at7.html
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    mantha3
    mantha3
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    • Post n°5

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    Post by mantha3 Tue Dec 06, 2011 9:50 am

    Thanks all!

    Looks like Jim McShane is temp. out of stock. I wonder if CV4024 are starting to get a little more scarce? I see boxes of 100 selling on E-pay but still wonder.

    I run Bobs ST120, a pair of McIntosh Monos and a Decware ZStage which all run 12AT7s so I'm looking to get a couple CV4024 spares.

    PS - I spent a bunch of $$ on some McIntosh MC75 60th anniversary amps... I do a sound comparison to the ST120 amp from Bob and at times I think I like Bobs ST120 better. Solid Scheyat.. Pardon my French.

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    rwferr
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    • Post n°6

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    Post by rwferr Fri Jan 13, 2012 10:56 pm

    I have the mullards but to me the NOS telefunkens are the best in my Latino ST-70. I have tried just about everything and they are the best by far to my ear.
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    Tube Nube
    Tube Nube
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    • Post n°7

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    Post by Tube Nube Sat Jan 14, 2012 1:38 am

    baddog1946 wrote:Mullards galore!
    http://www.mullardtubes.com/

    The site's coming up dead for me!
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    Tube Nube
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    • Post n°8

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    Post by Tube Nube Sat Jan 14, 2012 1:40 am

    Canadians on the list might look here:
    http://thetubestore.com/mul12atcv.html

    This place is in canada so it'll save you exchange (when there is any to speak of), but mostly the various duty charges ("brokerage fees") that sometimes run as high as 25% of the purchase.
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    ruffian
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    • Post n°9

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    Post by ruffian Sat Jan 14, 2012 2:20 am

    Doug's Tubes is where I sourced my CV4024s. Very reliable seller, never had a problem.
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    WntrMute2
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    • Post n°10

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    Post by WntrMute2 Sun Jul 14, 2013 7:16 am

    I was looking to source some of these for spares and found these at Upscale Audio

    http://www.upscaleaudio.com/products/Mullard-CV4024-%7B47%7D-12AT7.html

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    Dave_in_Va
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    • Post n°11

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    Post by Dave_in_Va Sun Jul 14, 2013 11:20 am

    I just received my ST-70 yesterday. What's the advantage of swapping in AT7's over AU7's?
    Thanks!
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    Bob Latino
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    • Post n°12

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    Post by Bob Latino Sun Jul 14, 2013 11:28 am

    Dave,

     You should not use 12AT7 tubes in YOUR amp. The OLDER VTA amps (KIT or WIRED) through March of 2012 use the higher gain 12AT7 driver tubes. The NEWER VTA amps (KIT or WIRED) built as of April 1 of 2012 use a LOWER GAIN version of the VTA driver board which uses 12AU7, 12BH7, 6189, 5963 or 5814 driver tubes.

    Bob
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    Dave_in_Va
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    • Post n°13

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    Post by Dave_in_Va Sun Jul 14, 2013 11:43 am

    Thanks. My amp is sounding great. I listened to LPs until 1 am this morning.
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