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    6p15p-ev tubes in the Dynaco ST-35?

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    hrudu90

    Posts : 26
    Join date : 2011-01-02

    6p15p-ev tubes in the Dynaco ST-35?

    Post by hrudu90 on Mon Sep 19, 2011 9:52 am

    I have some questions for the community regarding the ST35 and it is:

    • Can I use 6p15p-ev tubes in the Dynaco ST-35?

    • Can I use different tubes like Amperex EL84 in one channel and JJ EL84 in other channel?

    • Can I use one power tube per channel only?


    Hope you can help.

    ~~~

    GP49

    Posts : 717
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by GP49 on Mon Sep 19, 2011 11:17 am

    hrudu90 wrote:I have some questions for the community regarding the ST35 and it is:
    ~~~

    • Can I use 6p15p-ev tubes in the Dynaco ST-35?

    You can plug them in and they will probably work but the 6p15 types are rated at lower voltages than the EL84
    and may have a short life. Depends on exactly how the tube is being used (plate/screen/grid currents). The 6p14 types
    are the exact drop-ins for EL84/6BQ5.

    • Can I use different tubes like Amperex EL84 in one channel and JJ EL84 in other channel?

    You CAN without risk of damage,as the two channels are completely independent. That will make no difference as to
    push/pull matching though the two channels might SOUND different due to the different tubes.

    • Can I use one power tube per channel only?

    NO! NO! NEVER do that. An imbalanced current flow will occur in the output transformer.




    Bob Latino
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by Bob Latino on Mon Sep 19, 2011 12:57 pm

    Everything that GP49 has said is good advice. The 6P14 and 6P15 are available on Ebay for almost the same price with the 6P14's just a little more costly. Last year I bought 10 of the 6P14's from Russia for about $40 shipped. That's only $4.00 a tube.

    One other thing besides not using one output tube per channel. Don't ever run just ONE CHANNEL alone in the ST-35. The SINGLE bias resistor on an ST-35 is designed to draw current for FOUR EL84's (BOTH channels). If you plug the two output tubes into an ST-35 for just one channel, you will draw too much current and those two EL84's will "red plate" rather quickly. Just to understand, you CAN run just one channel at a time in an ST-70 (or the VTA ST-120) because in an ST-70 (or ST-120) each channel has separate bias resistors.

    Bob

    hrudu90

    Posts : 26
    Join date : 2011-01-02

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by hrudu90 on Mon Sep 19, 2011 11:45 pm

    Thank you Gentlemen!

    Bob,
    I looked up for 6P14 tubes on ebay but they always come up as 6P14P.
    Are they the same? Can I use them in the ST35?
    And how you like yours?
    Hru

    skriefal

    Posts : 116
    Join date : 2011-09-20
    Location : Utah, USA

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by skriefal on Tue Sep 20, 2011 1:32 am

    Yes, the 6P14P or 6P14P-EV is what you want. These should work fine in any EL84/6BQ5-equipped amp.

    Bob Latino
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by Bob Latino on Tue Sep 20, 2011 5:22 am

    hrudu90 wrote:Thank you Gentlemen!

    Bob,
    I looked up for 6P14 tubes on ebay but they always come up as 6P14P.
    Are they the same? Can I use them in the ST35?
    And how you like yours?
    Hru

    Hi Hru,

    Yes - the 6P14 and the 6P14P are the same tube ... I have two ST-35's here and use the 6P14P's as the output tubes in both. They sound fine and seem pretty durable .. Not one has failed in the past year or so. I would recommend them.

    Bob

    hrudu90

    Posts : 26
    Join date : 2011-01-02

    Re: 6p15p-ev tubes in the Dynaco ST-35?

    Post by hrudu90 on Wed Sep 21, 2011 11:27 am

    Thank you,
    great forum.


    ^^^^

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