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Pioneer Spec 4 Amplifier part substitutions

Discussion in 'Datasheets, Manuals and Component Identification' started by mrmodify, Mar 14, 2018.

  1. mrmodify

    mrmodify

    156
    29
    Feb 13, 2010
    Hi all,

    I have a Spec 4 amp that has fried the left channel. I can go in and test parts and find what the problem is but I don't trust myself on part substitutions

    I have contacted Mouser to try to find cross-references on the parts I will be needing. They had very few replacements. I have crossed all my parts to NTE which I have never had a problem with but I have read that they are not a very good option to use. I also have found my parts on EBay but I don't want to use that option either. I think Ebay would be worse than NTE.

    So I am asking if there is anyone out there who has substituted parts list for a amplifier section of a Spec 1 amp?

    If I do not have to have matching pairs or as the manual says certain parts should have the same Hfe then all I will need is the following parts.

    I am needing Q3 & 4 - 2SB554, Q6 - 2SA733-Q, Q8 - 2SC1904A-V, Q9 - 2SA899A-V, Q11 - 2SB628A-R, Q13 - 2SC945A-Q, & [email protected] & 3 - SV-04.
    I would really like to get this old girl up and going again if possible.

    Thanks
    John
     
  2. WHONOES

    WHONOES

    564
    111
    May 20, 2017
  3. 73's de Edd

    73's de Edd

    2,442
    819
    Aug 21, 2015
    Last edited: Mar 14, 2018
  4. mrmodify

    mrmodify

    156
    29
    Feb 13, 2010
    Thanks Whonoes & 73's de Edd,

    I did find a couple of transistor in the cross that is a big help, And Mouser contacted me today with the exact same outputs Mr. 73's de Edd posted.

    Thanks Men
     
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