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300B substitution

Discussion in 'Electronic Repair' started by Frank Thomas, Dec 13, 2004.

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  1. Frank Thomas

    Frank Thomas Guest

    Hi Troops!
    Is there a substitution for a 300B vacuum tube. I really can not afford a
    price tag of $134.00 and up. I am on a very fixed income. There must be a
    less expensive and better way to go.
    Thank you in advance,
    Frank Thomas

    I choose Polesoft Lockspam to fight spam, and you?
  2. John Del

    John Del Guest

    Subject: 300B substitution
    Well, properly run, a 300B will last almost forever. But you can get them
    about $100 each. If you can't find any, let me know.

    John Del
    Wolcott, CT

    "I'm just trying to get into heaven, I'm not running for Jesus!"
    Homer Simpson

    (remove S for email reply)
  3. Mike Diack

    Mike Diack Guest

    There is only one direct substitute for a 300B(or 300A), and that is the
    STC4300A, but it is even rarer and more expensive. The closest "common"
    USA tube is the "50" but it is lower powered and a different filament
    voltage. There is a closer British tube, the DA30 (which is a larger
    PX25) but on a different base, and rare and expensive. One of the
    Russian makers used to have a low mu variant of the 811 which was cheap
    as chips - dunno if it still exists. There are a number of elcheapo
    Chinese and Russian 300B copies. M
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