466 TEK Scope problem FOUND! -Question on replacement IC

Discussion in 'Electronic Repair' started by Chris, Nov 15, 2003.

  1. Chris

    Chris Guest

    Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    RCA 827 at the bottom.

    Any idea if I can swap this out with one from Radio Shack? Or does it
    have to be a Tektronix one of identical make?

    If I can swap it, can someone tell me what 8 pin Op Amp model I can
    use instead of this one? And will it affect calibration or should it
    be ok? -It's the op amp off of the +15v power supply schematic on my
    466 scope.

    Thank You,
    -Chris
     
    Chris, Nov 15, 2003
    #1
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  2. Chris

    James Sweet Guest

    "Chris" <chris1@oupower_dot_com> wrote in message
    news:...
    > Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    > the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    > RCA 827 at the bottom.
    >
    > Any idea if I can swap this out with one from Radio Shack? Or does it
    > have to be a Tektronix one of identical make?
    >
    > If I can swap it, can someone tell me what 8 pin Op Amp model I can
    > use instead of this one? And will it affect calibration or should it
    > be ok? -It's the op amp off of the +15v power supply schematic on my
    > 466 scope.
    >
    > Thank You,
    > -Chris


    The 1458 op-amp is a really common part, why not just get the right one?
    Here's one of many places selling it
    http://www.kelvin.com/Merchant2/merchant.mv?Screen=PROD&Product_Code=600026&Category_Code=ELPCICMI in this case it's a whopping 36 cents.
     
    James Sweet, Nov 15, 2003
    #2
    1. Advertising

  3. Chris

    Jim Yanik Guest

    chris1@oupower_dot_com (Chris) wrote in
    news::

    > Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    > the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    > RCA 827 at the bottom.
    >
    > Any idea if I can swap this out with one from Radio Shack? Or does it
    > have to be a Tektronix one of identical make?
    >
    > If I can swap it, can someone tell me what 8 pin Op Amp model I can
    > use instead of this one? And will it affect calibration or should it
    > be ok? -It's the op amp off of the +15v power supply schematic on my
    > 466 scope.
    >
    > Thank You,
    > -Chris


    I would not substitute other IC types,you can use a generic 1458,dunno if
    RS has them.As another has posted,the 1458 is still available,and
    inexpensive.

    --
    Jim Yanik,NRA member
    jyanik-at-kua.net
     
    Jim Yanik, Nov 15, 2003
    #3
  4. Chris

    Chris Guest

    Thanks guys, I ordered the MC1458P from Mouser. I should be all set in
    a few days when it arrives. I did notice something cool however.

    I'm half tempted to try this because I'm anxious to see it work again
    and know that I got everything. I'd hate to still have more bad parts
    that I have not yet found.

    The Op Amp is a DUAL chip. In the schematic it's clearly using the 2nd
    amp and the first side seems to be just sitting there. I bet I could
    re-wire my current chip to work if I just utilize pins 1, 2, 3 instead
    of the 5,6,7 that it is using now.

    I'm very tempted to try this. I will still need to use pins 4 and 8
    for the Vcc + / - , but as long as those 2 pins are ok, my idea seems
    sound that I could just use the other side of the chip *lol*

    Your comments are most appreciated :)

    -Chris

    On Sat, 15 Nov 2003 02:32:57 +0000 (UTC), Jim Yanik <>
    wrote:
    >chris1@oupower_dot_com (Chris) wrote in
    >news::
    >
    >> Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    >> the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    >> RCA 827 at the bottom.
    >>
    >> Any idea if I can swap this out with one from Radio Shack? Or does it
    >> have to be a Tektronix one of identical make?
    >>
    >> If I can swap it, can someone tell me what 8 pin Op Amp model I can
    >> use instead of this one? And will it affect calibration or should it
    >> be ok? -It's the op amp off of the +15v power supply schematic on my
    >> 466 scope.
    >>
    >> Thank You,
    >> -Chris

    >
    >I would not substitute other IC types,you can use a generic 1458,dunno if
    >RS has them.As another has posted,the 1458 is still available,and
    >inexpensive.
    >
    >--
    >Jim Yanik,NRA member
    >jyanik-at-kua.net
     
    Chris, Nov 15, 2003
    #4
  5. Chris

    Jim Yanik Guest

    chris1@oupower_dot_com (Chris) wrote in
    news::

    > Thanks guys, I ordered the MC1458P from Mouser. I should be all set in
    > a few days when it arrives. I did notice something cool however.
    >
    > I'm half tempted to try this because I'm anxious to see it work again
    > and know that I got everything. I'd hate to still have more bad parts
    > that I have not yet found.
    >
    > The Op Amp is a DUAL chip. In the schematic it's clearly using the 2nd
    > amp and the first side seems to be just sitting there. I bet I could
    > re-wire my current chip to work if I just utilize pins 1, 2, 3 instead
    > of the 5,6,7 that it is using now.
    >
    > I'm very tempted to try this. I will still need to use pins 4 and 8
    > for the Vcc + / - , but as long as those 2 pins are ok, my idea seems
    > sound that I could just use the other side of the chip *lol*
    >
    > Your comments are most appreciated :)
    >
    > -Chris


    >>I would not substitute other IC types,you can use a generic 1458,dunno
    >>if RS has them.As another has posted,the 1458 is still available,and
    >>inexpensive.
    >>
    >>--
    >>Jim Yanik,NRA member
    >>jyanik-at-kua.net

    >
    >


    Why bother? Go to Radio Shack,see if they have one,or an ECG equivalent
    from a local distributor.

    --
    Jim Yanik,NRA member
    jyanik-at-kua.net
     
    Jim Yanik, Nov 15, 2003
    #5
  6. Chris

    Chris Guest

    Radio Shack doesn't have anything but some stupid shit :) lol. I will
    just wait until it comes in the mail I guess :) I did discover last
    night that it uses both sides of each Op Amp so I can't do what I was
    talking about. I thought it odd that it would only use 1/2 so mystery
    solved. I need a 4158 or equivelent. I called all the TV Repair shops
    nearby but turned up nothing :( Guess online is my only recourse.
    That's kind of a shame.

    -Chris

    On Sat, 15 Nov 2003 15:03:10 +0000 (UTC), Jim Yanik <>
    wrote:
    >chris1@oupower_dot_com (Chris) wrote in
    >news::
    >
    >> Thanks guys, I ordered the MC1458P from Mouser. I should be all set in
    >> a few days when it arrives. I did notice something cool however.
    >>
    >> I'm half tempted to try this because I'm anxious to see it work again
    >> and know that I got everything. I'd hate to still have more bad parts
    >> that I have not yet found.
    >>
    >> The Op Amp is a DUAL chip. In the schematic it's clearly using the 2nd
    >> amp and the first side seems to be just sitting there. I bet I could
    >> re-wire my current chip to work if I just utilize pins 1, 2, 3 instead
    >> of the 5,6,7 that it is using now.
    >>
    >> I'm very tempted to try this. I will still need to use pins 4 and 8
    >> for the Vcc + / - , but as long as those 2 pins are ok, my idea seems
    >> sound that I could just use the other side of the chip *lol*
    >>
    >> Your comments are most appreciated :)
    >>
    >> -Chris

    >
    >>>I would not substitute other IC types,you can use a generic 1458,dunno
    >>>if RS has them.As another has posted,the 1458 is still available,and
    >>>inexpensive.
    >>>
    >>>--
    >>>Jim Yanik,NRA member
    >>>jyanik-at-kua.net

    >>
    >>

    >
    >Why bother? Go to Radio Shack,see if they have one,or an ECG equivalent
    >from a local distributor.
    >
    >--
    >Jim Yanik,NRA member
    >jyanik-at-kua.net
     
    Chris, Nov 15, 2003
    #6
  7. Chris

    Jim Yanik Guest

    chris1@oupower_dot_com (Chris) wrote in
    news::

    > Radio Shack doesn't have anything but some stupid shit :) lol. I will
    > just wait until it comes in the mail I guess :) I did discover last
    > night that it uses both sides of each Op Amp so I can't do what I was
    > talking about. I thought it odd that it would only use 1/2 so mystery
    > solved. I need a 4158 or equivelent. I called all the TV Repair shops
    > nearby but turned up nothing :( Guess online is my only recourse.
    > That's kind of a shame.
    >
    > -Chris
    >
    > On Sat, 15 Nov 2003 15:03:10 +0000 (UTC), Jim Yanik <>
    > wrote:
    >>chris1@oupower_dot_com (Chris) wrote in
    >>news::
    >>
    >>> Thanks guys, I ordered the MC1458P from Mouser. I should be all set in
    >>> a few days when it arrives. I did notice something cool however.
    >>>
    >>> I'm half tempted to try this because I'm anxious to see it work again
    >>> and know that I got everything. I'd hate to still have more bad parts
    >>> that I have not yet found.
    >>>
    >>> The Op Amp is a DUAL chip. In the schematic it's clearly using the 2nd
    >>> amp and the first side seems to be just sitting there. I bet I could
    >>> re-wire my current chip to work if I just utilize pins 1, 2, 3 instead
    >>> of the 5,6,7 that it is using now.
    >>>
    >>> I'm very tempted to try this. I will still need to use pins 4 and 8
    >>> for the Vcc + / - , but as long as those 2 pins are ok, my idea seems
    >>> sound that I could just use the other side of the chip *lol*
    >>>
    >>> Your comments are most appreciated :)
    >>>
    >>> -Chris

    >>
    >>>>I would not substitute other IC types,you can use a generic 1458,dunno
    >>>>if RS has them.As another has posted,the 1458 is still available,and
    >>>>inexpensive.
    >>>>
    >>>>--
    >>>>Jim Yanik,NRA member
    >>>>jyanik-at-kua.net
    >>>
    >>>

    >>
    >>Why bother? Go to Radio Shack,see if they have one,or an ECG equivalent
    >>from a local distributor.
    >>
    >>--
    >>Jim Yanik,NRA member
    >>jyanik-at-kua.net

    >
    >


    Don't call TV repair shops,call the local *electronics parts distributor*.
    Chances are they sell ECG parts,and there's an ECG version of the 1458.

    A TV repair shop isn't going to want to sell you parts.

    --
    Jim Yanik,NRA member
    jyanik-at-kua.net
     
    Jim Yanik, Nov 16, 2003
    #7
  8. Isn't the MC1458 just a general purpose vanilla flavored op-amp? Why all
    the fuss? Almost anything with the industry standard pinout would likely
    work, at least as a test. :)

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
    Sam Goldwasser, Nov 16, 2003
    #8
  9. Chris

    Jim Yanik Guest

    Sam Goldwasser <> wrote in
    news::

    > Isn't the MC1458 just a general purpose vanilla flavored op-amp? Why
    > all the fuss? Almost anything with the industry standard pinout would
    > likely work, at least as a test. :)
    >


    It's a dual op-amp.

    --
    Jim Yanik,NRA member
    jyanik-at-kua.net
     
    Jim Yanik, Nov 16, 2003
    #9
  10. Jim Yanik <> writes:

    > Sam Goldwasser <> wrote in
    > news::
    >
    > > Isn't the MC1458 just a general purpose vanilla flavored op-amp? Why
    > > all the fuss? Almost anything with the industry standard pinout would
    > > likely work, at least as a test. :)


    > It's a dual op-amp.


    Sorry, yes I know, my slip. The point is that everyone is going obsessive
    about getting the exact replacement.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
    Sam Goldwasser, Nov 16, 2003
    #10
  11. Chris

    James Sweet Guest

    "Sam Goldwasser" <> wrote in message
    news:...
    > Jim Yanik <> writes:
    >
    > > Sam Goldwasser <> wrote in
    > > news::
    > >
    > > > Isn't the MC1458 just a general purpose vanilla flavored op-amp? Why
    > > > all the fuss? Almost anything with the industry standard pinout would
    > > > likely work, at least as a test. :)

    >
    > > It's a dual op-amp.

    >
    > Sorry, yes I know, my slip. The point is that everyone is going obsessive
    > about getting the exact replacement.
    >
    >


    But... didn't he say he already ordered an exact replacement? It's cheap
    enough, why is this thread even still going?
     
    James Sweet, Nov 16, 2003
    #11
  12. "James Sweet" <> writes:

    > "Sam Goldwasser" <> wrote in message
    > news:...
    > > Jim Yanik <> writes:
    > >
    > > > Sam Goldwasser <> wrote in
    > > > news::
    > > >
    > > > > Isn't the MC1458 just a general purpose vanilla flavored op-amp? Why
    > > > > all the fuss? Almost anything with the industry standard pinout would
    > > > > likely work, at least as a test. :)

    > >
    > > > It's a dual op-amp.

    > >
    > > Sorry, yes I know, my slip. The point is that everyone is going obsessive
    > > about getting the exact replacement.


    > But... didn't he say he already ordered an exact replacement? It's cheap
    > enough, why is this thread even still going?


    Beats me. :) But ordering a 50 cent part from Mouser still has a several
    dollar shipping and handling charge!

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
    Sam Goldwasser, Nov 16, 2003
    #12
  13. Chris

    Asimov Guest

    "Jim Yanik" bravely wrote to "All" (16 Nov 03 01:05:08)
    --- on the heady topic of "Re: 466 TEK Scope problem FOUND! -Question on replacement IC"

    JY> From: Jim Yanik <>
    JY> A TV repair shop isn't going to want to sell you parts.

    I noticed that repair shops in general are not the most sympathetic to
    hobbyists. A pox on them! ;-)

    .... Techs would rather pee on an electric fence for the light show
     
    Asimov, Nov 17, 2003
    #13
  14. Chris

    TekMan Guest

    Jim Yanik <> wrote in message news:<Xns9433DB4349810jyanikkuanet@204.117.192.21>...
    > chris1@oupower_dot_com (Chris) wrote in
    > news::
    >
    > > Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    > > the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    > > RCA 827 at the bottom.
    > >
    > > Any idea if I can swap this out with one from Radio Shack? Or does it
    > > have to be a Tektronix one of identical make?
    > >
    > > If I can swap it, can someone tell me what 8 pin Op Amp model I can
    > > use instead of this one? And will it affect calibration or should it
    > > be ok? -It's the op amp off of the +15v power supply schematic on my
    > > 466 scope.
    > >
    > > Thank You,
    > > -Chris

    >
    > I would not substitute other IC types,you can use a generic 1458,dunno if
    > RS has them.As another has posted,the 1458 is still available,and
    > inexpensive.


    The TL072 / TL082 worked well in my repairs.

    Also substitutes from PMI did.

    But avoid all dual opamp types with BW-gain produkt of more than 3MHz.
    Then oscialltion might occur in some cases.

    When you look at the circuit, yo usee that the regulation is well
    designed, there is no voltage stress on the opamps (everything stays
    very well below the maximum supply voltage limits).


    HTH,

    Andreas
     
    TekMan, Nov 26, 2003
    #14
  15. If the original op-amp was anything with a "X58", almost anything with
    the same pinout will be at least as good! :)

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.


    (TekMan) writes:

    > Jim Yanik <> wrote in message news:<Xns9433DB4349810jyanikkuanet@204.117.192.21>...
    > > chris1@oupower_dot_com (Chris) wrote in
    > > news::
    > >
    > > > Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
    > > > the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
    > > > RCA 827 at the bottom.
    > > >
    > > > Any idea if I can swap this out with one from Radio Shack? Or does it
    > > > have to be a Tektronix one of identical make?
    > > >
    > > > If I can swap it, can someone tell me what 8 pin Op Amp model I can
    > > > use instead of this one? And will it affect calibration or should it
    > > > be ok? -It's the op amp off of the +15v power supply schematic on my
    > > > 466 scope.
    > > >
    > > > Thank You,
    > > > -Chris

    > >
    > > I would not substitute other IC types,you can use a generic 1458,dunno if
    > > RS has them.As another has posted,the 1458 is still available,and
    > > inexpensive.

    >
    > The TL072 / TL082 worked well in my repairs.
    >
    > Also substitutes from PMI did.
    >
    > But avoid all dual opamp types with BW-gain produkt of more than 3MHz.
    > Then oscialltion might occur in some cases.
    >
    > When you look at the circuit, yo usee that the regulation is well
    > designed, there is no voltage stress on the opamps (everything stays
    > very well below the maximum supply voltage limits).
    >
    >
    > HTH,
    >
    > Andreas
     
    Sam Goldwasser, Nov 26, 2003
    #15
  16. Chris

    TekMan Guest

    Sam Goldwasser <> wrote in message news:<>...
    > If the original op-amp was anything with a "X58", almost anything with
    > the same pinout will be at least as good! :)
    >


    Well sam, but modern types of opamps have similar pinout, but
    sometimes MUCH higher BW.
    That's the point I wanted to make shure it's noted.
    Because it's no fun to run into an oscillating pwr supply problem.


    hth,
    Andreas
     
    TekMan, Nov 28, 2003
    #16
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