Connect with us

Transistors needed,

Discussion in 'General Electronics Discussion' started by andomando, Apr 28, 2016.

Scroll to continue with content
  1. andomando

    andomando

    6
    0
    Jul 11, 2013
    I am having a hard time trying to find substitute transistors for ;RCA1C03 and RCA1C04.
    If anyone could help me that would be great.

    regards to all.

    Andy
     
  2. Sadlercomfort

    Sadlercomfort Ash

    424
    53
    Feb 9, 2013
    TIP41C or maybe TIP31C? The characteristics are fairly similar

    I guess it depends on the application, since choosing an equivalent transistor usually involves a compromise with its characteristics.
     
    andomando likes this.
  3. andomando

    andomando

    6
    0
    Jul 11, 2013
    Thank you for your help.I have ordered these transistors,though still not sure what i can replace the rca1c04 with as this is PNP transistor.
    These are on a Carlsboro Cobra 90 bass amplifier.that i am trying to repair for my son.
    regards
    Andy
     
  4. dorke

    dorke

    2,342
    665
    Jun 20, 2015
  5. 73's de Edd

    73's de Edd

    2,805
    1,175
    Aug 21, 2015
    .

    Sir andomando. . . . . . .

    Those RCA numbers made me go back to the '80's and consult some of my design reference books from that time frame.
    I am now wondering if your amp unit is made along these manners that RCA used back then.
    If so, then your RCA 1C03 and 1C04 would be used as complementary driver transistors to the RCA1B06 output transistors.

    INITIALLY RCA made that unit using metal cased transistors, with TO-3 metal cased output transistors and either TO-66 or TO-39 metal cased driver transistors.

    Then the economy transition to using plastic transistors . . . .2N5840's for the outputs and 2N6293 and 2N6476 JEDEC series of transistors for the drivers.

    FINALLY they digress to using the 1C03 and 1C04 series that you refer to.
    The 2N . . .JEDEC . . .series are still available if you just seek them out.

    The already suggested . . . . .TIP 31C and TIP41C have their matched PNP complements of TIP 32C and TIP42C, but are a bit WEAK in the hFE spec.

    The logical next TIP choice would be the TIP 147T and TIP 142T but their hFE spec, possibly might be too high up in the 500+ range.

    The ECG series straddle across the lower 15-150 hFE spec

    TECHNO REFERENCING:

    (MAG it on up . . . .it gets reeeeel beeeeeeg)


    [​IMG]




    Thasssit . . . .


    73's de Edd



    .
     
    Last edited: Apr 29, 2016
    andomando likes this.
  6. Sadlercomfort

    Sadlercomfort Ash

    424
    53
    Feb 9, 2013
    These two are perfect! How did you find these dorke?

    I have limited experience with selecting transistors so had to look on farnell.
     
  7. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Googled,they claim to be the best search engine,mostly as advertised...;)
    "rca1c03 equivalent", the 2nd result was it.
    Had to check the parameters agreed.
     
  8. Sadlercomfort

    Sadlercomfort Ash

    424
    53
    Feb 9, 2013
    Ah, I had assumed google had already been probed :rolleyes:
     
  9. andomando

    andomando

    6
    0
    Jul 11, 2013
    Thank you for your info and help.
     
  10. andomando

    andomando

    6
    0
    Jul 11, 2013
    I have added two schematics of amplifier these transistors are in.
     

    Attached Files:

    • bg1.jpg
      bg1.jpg
      File size:
      174.6 KB
      Views:
      138
    • bg2.jpg
      bg2.jpg
      File size:
      228.9 KB
      Views:
      88
  11. andomando

    andomando

    6
    0
    Jul 11, 2013
    Can anyone tell me the value of the two resistors R17 & R18 Marked R24 7W.
     
  12. Sadlercomfort

    Sadlercomfort Ash

    424
    53
    Feb 9, 2013
    The R denotes a decimal point, just like a 2.2K Ohm resistor is marked 2K2.

    24000000 -> 24M
    24000 -> 24k
    24 -> 24R
    2.4 -> 2R4
    0.24 -> R24

    So its a 0.24 Ohm resistor 7W :)
     
    davenn likes this.
  13. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Yes,
    "R" stands for the decimal point .
     
    Sadlercomfort likes this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-