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Thread: My PL700B by Marco

  1. #1
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item

    My PL700B by Marco

    Here are the first pics . Work in in progress .Click image for larger version. 

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    Ciao
    Marco

  2. #2
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    I have some questions about PL 700B transistors , because after a more
    in depth diagnosis these transistor are K.O. (one channel only )
    - 2N 1304 ( is 2N 440 A a good replacement ?)
    - 2N 1305 ( already found )
    - Rca 40327 ( is 2N 3440 a good replacement ? )
    - 2N 3403 ( is it possible to re-use the heatsink ? )
    - RCA 410 ( is MJ 1800 a good replacemement ? )
    For power transistors no problem , because I have a complete set ( 20 )
    of XPL 909 marked with blue ink like original ( 5 K.O )
    Anyway no problem to find everything in ebay.com
    Replacement transistors are available in Italy and UK .
    Thank you in advance and ciao
    Marco
    P.S: a little surprise : Phase Linear mounted a 10 A fuse instead of 5A on AC mains .
    Unbelievable .

  3. #3
    Forum Veteran Lazarus Short's Avatar
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    I'm the Red Knight, by grant of the Black
    The ten-amp fuse was probably added later.
    What an elder can see sitting down, a youth cannot see standing up. [old Yoruba proverb]
    Look! Isn't that Uncle Patrel in a...in a taxi?! [3Mustaphas3]
    But...you keep looking over your shoulder...to see if I am ​there... [Curved Air]
    Who gives water to a goose as the land brightens for the morning of its slaughter? [Egyptian, Tale of the Shipwrecked Sailor]
    ...more dust bunnies than a desert bordello... [Orange]
    Aziz...LIGHT! [Professor Pacoli, Fifth Element]

  4. #4
    Quote Originally Posted by marcok View Post
    I have some questions about PL 700B transistors , because after a more
    in depth diagnosis these transistor are K.O. (one channel only )
    - 2N 1304 ( is 2N 440 A a good replacement ?)
    - 2N 1305 ( already found )
    - Rca 40327 ( is 2N 3440 a good replacement ? )
    - 2N 3403 ( is it possible to re-use the heatsink ? )
    - RCA 410 ( is MJ 1800 a good replacemement ? )
    For power transistors no problem , because I have a complete set ( 20 )
    of XPL 909 marked with blue ink like original ( 5 K.O )
    Anyway no problem to find everything in ebay.com
    Replacement transistors are available in Italy and UK .
    Thank you in advance and ciao
    Marco
    P.S: a little surprise : Phase Linear mounted a 10 A fuse instead of 5A on AC mains .
    Unbelievable .
    Marco,

    The 2N3440 will work as a replacement for the 40327.

    Other people on this forum have been re-using the 2N3403 heat-sink.

    Although Phase Linear used the MJ1800's as driver transistors for a short period of time, I do not know how "good" or reliable it was and why they stopped using it.
    NOTE: There is a fellow on ebay in the U.S. selling RCA410's for less than $2.50 each.
    https://www.ebay.it/itm/RCA410-RCA-T...EAAOSwDNdV3kYX

    Since you are in Italy and the line voltage should be around 230V, I would expect the AC (line supply) fuses to be 5A not 10A (for 120V use).

    Ed

  5. #5
    Forum Veteran marcok's Avatar
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    Possible , because everything is possible ,
    but I know the history of this unit .
    40 years ago my hifi guru sold it to the previous owner factory made .
    The reason of this fault is that this guy lately used this unit in the
    bathroom every morning for 10 minutes during shaving .
    Humidity and condensation and after obviously smoke !
    My hifi guru worked in a shop that was the official retailer for Milan zone
    for PL , Altec, Klipsch and other makes and furthermore
    the lab of this shop was the PL official repair center for Italy .
    Any way they are things that happen .
    Now I request infos about transistors to do the best choice .
    Ciao
    Marco

  6. #6
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    Thank you Ed .
    Infact I and my hifi guru
    were surprised to find a 10A fuse .
    It was only a consideration .
    Any way the story is always the same :
    check everything before power on.
    Ciao
    Marco

  7. #7
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    ---I run with Scissors
    Hey Marco; What do you think of the new F1 rollbars? I do not understand the post right in front of face??
    And Hamilton does not alway's win!

  8. #8
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    Quote Originally Posted by oldphaser View Post
    Marco,

    .
    NOTE: There is a fellow on ebay in the U.S. selling RCA410's for less than $2.50 each.
    https://www.ebay.it/itm/RCA410-RCA-T...EAAOSwDNdV3kYX

    Ed
    Looking at the marks on the case and the 1979 datecode the one in the pic is a pull. Buyer beware.

  9. #9
    Forum Veteran marcok's Avatar
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    Quote Originally Posted by Bradrock View Post
    Hey Marco; What do you think of the new F1 rollbars? I do not understand the post right in front of face??
    And Hamilton does not alway's win!
    Simply ugly .The name of this rollbar is Halo .The F1 circus is an insane world .
    I hope now the new American owners of the Circus will change the rules in the right way . ( 2021 ).
    Ciao
    Marco

  10. #10
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    ---I run with Scissors
    Quote Originally Posted by marcok View Post
    Simply ugly .The name of this rollbar is Halo .The F1 circus is an insane world .
    I hope now the new American owners of the Circus will change the rules in the right way . ( 2021 ).
    Ciao
    Marco
    Thank you! I did not want to say ugly & possibly offend a real F1 fan! I hope they go back to a REAL pace car! Virtual pace car? Virtual rules? virtual judges? virtual winner!?? What?

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