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Peavey Microbass Repair (IC Identification)

Discussion in 'Electronic Repair' started by Beldar Grazinski, Oct 11, 2013.

  1. I contacted Peavey and got a schematic to repair an amp we use here at the station but still have one more question on it that Peavey has yet to respond to.

    IC3 is bad on the board and has no readable information on the top of the chip. According to the drawing it is a 7041 3080 chip. I have yet to find a cross reference for this chip. 8 pin dip.

    Any suggestions?
  2. N_Cook

    N_Cook Guest

    Is the amp date 2007 ?
    I would go for CA3080 by JRC, is a JFET opamp in that position justified?
  3. Thanks for the info guys. The amp appears to be a '99 model. I finally got a callback from Peavey and they said a CA3080 would suffice. Peavey sells the part (39095750) but they want $15 for the chip so I'll shop around before I go to them.
  4. Phil Allison

    Phil Allison Guest

    "Gareth Magennis" ** That listing is a bit dodgy.

    In a few seconds, I spotted the PV number " SJE5332" being given as both
    MJE253 and MJE15029.

    One is a TO126, the other a TO220 and the base emitter pins outs differ.

    Further down, it refers to the PV "62792" as a 2N3055 being a 140V output
    transistor - which none are.

    Another worry is the PV "83070" as being an MJ3055 - which never existed.

    Motorola 2N3055s were labelled that and the compliment was the MJ2955.

    .... Phil
  5. Phil Allison

    Phil Allison Guest

    "Arfa Daily"

    ** FFS you ass - you trimmed the CRUCIAL part of my post.

    " Motorola 2N3055s were labelled that and the compliment was the MJ2955."

    There was never a Motorola MJ3055.

    ** Seen any little green men lately - have you ??

    ** Hmmm - that pdf looks VERY dodgy indeed.

    A recent ( ie 2002) "short form" data sheet from Semelab in Scotland with
    specs that match the original (1960s) JEDEC spec for the 2N3055 type number
    except for a mysterious 10A current rating in lieu of 15A.

    Semelab do many naughty things, like badging devices that are only
    approximate equivalents to an old type number so they can pretend to have a
    huge catalogue. Fools the punters.


    Because of the popular Motorola types MJE3055 and MJE3055T - many folk
    assume there must be an MJ3055 to go with them. It's a common mistake seen
    in print here and there for decades.

    No surprise the world champion finder of all misinformation " Google " turns
    another one up.

    Re JEDEC:

    .... Phil
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