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    How would you Modify a MK III to use EL156 tube ?

    Tazsmonn
    Tazsmonn


    Posts : 18
    Join date : 2009-01-18
    Age : 62
    Location : Richfield (S. Minneapolis) Minnesota

    How would you Modify a MK III to use EL156 tube  ? Empty How would you Modify a MK III to use EL156 tube ?

    Post by Tazsmonn Mon Jun 22, 2009 11:26 pm

    Could you just set the bias and let go?

    I have checked the heater current need 1.9A each & believe there would be no problem with the source being able to put out 5A.

    Am going to try it this weekend.

    Will report latter.
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    GP49


    Posts : 792
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    How would you Modify a MK III to use EL156 tube  ? Empty Re: How would you Modify a MK III to use EL156 tube ?

    Post by GP49 Tue Jun 23, 2009 12:50 am

    Tazsmonn wrote:Could you just set the bias and let go?

    I have checked the heater current need 1.9A each & believe there would be no problem with the source being able to put out 5A.

    Am going to try it this weekend.

    Will report latter.

    You mean, other than the EL156 needing a ten-pin socket?

    Spec sheet:

    http://www.mif.pg.gda.pl/homepages/frank/sheets/118/e/EL156.pdf

    I don't know for sure but would suspect that this tube will require more negative voltage on the grid to bias up properly.
    Tazsmonn
    Tazsmonn


    Posts : 18
    Join date : 2009-01-18
    Age : 62
    Location : Richfield (S. Minneapolis) Minnesota

    How would you Modify a MK III to use EL156 tube  ? Empty 8 pin EL 156

    Post by Tazsmonn Tue Jun 23, 2009 11:10 am

    Antique Electronic Supply sells an 8 pin style EL 156, this is what I have.
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    GP49


    Posts : 792
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    How would you Modify a MK III to use EL156 tube  ? Empty Re: How would you Modify a MK III to use EL156 tube ?

    Post by GP49 Tue Jun 23, 2009 4:48 pm

    Ah, I see that the Chinese put an octal base on it!

    The screen grid voltage in Class AB seems a bit low at 350 volts.

    Specs at:

    http://ozvalveamps.elands.com/el156generic.htm

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    How would you Modify a MK III to use EL156 tube  ? Empty Re: How would you Modify a MK III to use EL156 tube ?

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