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

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    Tazsmonn

    Posts : 18
    Join date : 2009-01-18
    Age : 54
    Location : Richfield (S. Minneapolis) Minnesota

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

    Post by Tazsmonn on 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.

    GP49

    Posts : 718
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

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

    Post by GP49 on 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

    Posts : 18
    Join date : 2009-01-18
    Age : 54
    Location : Richfield (S. Minneapolis) Minnesota

    8 pin EL 156

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

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

    GP49

    Posts : 718
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

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

    Post by GP49 on 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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