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-   -   Help ID 2 transistors (http://www.diyaudio.com/forums/solid-state/227366-help-id-2-transistors.html)

brucetassin 9th January 2013 03:38 AM

Help ID 2 transistors
 
Hello Good people,
I need help ID'ing two transistors.
Q101 and Q102. They are used in an EICO Cortina 3070 amp. They are used in the PHONO preamp. PC board #82529 I have the schematic but no part numbers
on it. Any help.....thanks
Bruce

dchisholm 9th January 2013 05:06 AM

Well, yeah, without even a schematic the best I can do is some seat-of-the-pants speculation. I vaguely recall the "Cortina" series products from about 1970. Given the general improvement in device performance over the intervening 40 years I'd suggest that the BC550 (NPN) and BC560 (PNP) would be acceptable substitutes for just about any small-signal transistor likely to be found in the preamp section.

If the devices are definitely faulty, a more significant question is what caused the failure. Again going on the age of this unit, a wholesale replacement of electrolytic capacitors may be a wise first step.

Dale

brucetassin 9th January 2013 02:23 PM

1 Attachment(s)
Thanks for the reply. I am hopeing someone will have a manual for this amp and could look up the transistor numbers.

east electronics 9th January 2013 02:55 PM

this a very generic phono stage anything will work there try BC5XX types aim for high hfe and you are done nothing special about them or the circuit

TANDBERGEREN 9th January 2013 03:59 PM

BC547B /BC549B would suit that phonostage just fine.
I have saw some similar stages with BC549C for the Q101. Q102 would just do fine with a medium Hfe-type; BC549B (Hfe around 500).

oz7aff 9th January 2013 04:20 PM

Hello

You might find some help here Modifying and Restoring the Cortina 3070

brucetassin 9th January 2013 05:54 PM

Thanks, I've been to that web site but could not find the transistor numbers.

Frank Berry 9th January 2013 05:59 PM

I'll bet that a pair of 2N2222 transistors would work nicely.

oz7aff 9th January 2013 06:08 PM

Quote:

Originally Posted by brucetassin (Post 3318233)
Thanks, I've been to that web site but could not find the transistor numbers.

That is correct, but you can post an question on this side.

brucetassin 9th January 2013 06:21 PM

I have several 2N2222 on hand. I'm not a designer so would I need to change
any resistor values for the 2N2222's to work properly. I have a tube pre-amp, a op-am pre-amp and I want to build the transistor version just to amuse myself.
thanks all for helping.
Bruce


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