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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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Rockitdog
Tom Pickett
6 posters

    Mullard NOS GZ33 or GZ37 Rectifiers

    Tom Pickett
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    Tom Pickett


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    • Post n°1

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Wed Apr 28, 2021 7:42 pm

    Been hearing a lot of good news on the forum about these Mullard NOS GZ33 or GZ37 Rectifiers. Also they are very tall.

    I've never used any of these tubes before and was wondering if they will fit under the Dynaco ST 70 cage I'm considering to buy for my VTA ST 120 ?
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    Tom Pickett
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    • Post n°2

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Wed Apr 28, 2021 8:06 pm

    The base to the top of the KT 120 is 114mm / 4.49 inches

    The base to the top of the GZ37 is 128mm / 5.04 inches
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    Rockitdog
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    Rockitdog


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    • Post n°3

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Rockitdog Wed Apr 28, 2021 8:50 pm

    I have a GZ33 in my ST-70 and the cage does not fit. But, it looks so good I don't want to cover it anyway... Very Happy

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    Hops
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    Hops


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    • Post n°4

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Hops Wed Apr 28, 2021 8:59 pm

    Get one of Bob's plexiglass board covers and skip the overall cover. The plexiglass looks sharp, and keeps visitor's fingers away from the high voltage.

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    Dave_in_Va
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    • Post n°5

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Dave_in_Va Wed Apr 28, 2021 9:19 pm

    I'm pretty sure they don't as I checked into this for my VTA ST70 a few years back. I also wanted to try the Mullard rectifiers.
    I'm pretty sure the cage for the 120 and the 70 are the same.

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    Tom Pickett
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    • Post n°6

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Wed Apr 28, 2021 10:19 pm

    Hops wrote:Get one of Bob's plexiglass board covers and skip the overall cover.  The plexiglass looks sharp,  and keeps visitor's fingers away from the high voltage.

    I bought and added the plexiglass board cover with my kit when I made my purchase. Mullard NOS GZ33 or GZ37 Rectifiers 1f600
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    Tom Pickett
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    • Post n°7

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Wed Apr 28, 2021 10:31 pm

    Maybe there is a way to add a .55 inch riser to the bottom of the cage ? I do believe the KT 120 tubes fit if I'm not wrong ? There is only a 0.55 inch difference between the KT-220 and the GZ33/37.

    Hummmmm ? Thinking here......
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    Tom Pickett
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    • Post n°8

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Wed Apr 28, 2021 10:41 pm

    Rockitdog wrote:I have a GZ33 in my ST-70 and the cage does not fit.  But, it looks so good I don't want to cover it anyway... Very Happy

    Rockitdog Do I hear Tube Envy in your post lol hahaha  Mullard NOS GZ33 or GZ37 Rectifiers 1f605
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    New2Tubez
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    • Post n°9

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by New2Tubez Wed Apr 28, 2021 10:48 pm

    Tom Pickett wrote:Maybe there is a way to add a .55 inch riser to the bottom of the cage ? I do believe the KT 120 tubes fit if I'm not wrong ? There is only a 0.55 inch difference between the KT-220 and the GZ33/37.

    Hummmmm ? Thinking here......

    KT120's definitely fit under the Dynakit tube cage with little room to spare.  I have no experience with the GZs

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    Pablo
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    • Post n°10

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Pablo Wed Apr 28, 2021 11:16 pm

    From the top surface of the socket with the tube inserted, my Mullard GZ33 measures 5.0 inches.

    Depending on how much of the GZ33 would extend past the top of the cage, you could consider cutting a hole in the cage to allow it to protude.
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    Tom Pickett
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    • Post n°11

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

    Post by Tom Pickett Thu Apr 29, 2021 12:11 am

    Pablo wrote:From the top surface of the socket with the tube inserted, my Mullard GZ33 measures 5.0 inches.

    Depending on how much of the GZ33 would extend past the top of the cage, you could consider cutting a hole in the cage to allow it to protude.

    Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602 Mullard NOS GZ33 or GZ37 Rectifiers 1f602
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    • Post n°12

    Mullard NOS GZ33 or GZ37 Rectifiers Empty Re: Mullard NOS GZ33 or GZ37 Rectifiers

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