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Old 9th January 2013, 03:38 AM   #1
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Default 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
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Old 9th January 2013, 05:06 AM   #2
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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
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Old 9th January 2013, 02:23 PM   #3
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Thanks for the reply. I am hopeing someone will have a manual for this amp and could look up the transistor numbers.
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Old 9th January 2013, 02:55 PM   #4
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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
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Old 9th January 2013, 03:59 PM   #5
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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).
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Old 9th January 2013, 04:20 PM   #6
oz7aff is offline oz7aff  Denmark
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Hello

You might find some help here Modifying and Restoring the Cortina 3070
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Old 9th January 2013, 05:54 PM   #7
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Thanks, I've been to that web site but could not find the transistor numbers.
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Old 9th January 2013, 05:59 PM   #8
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I'll bet that a pair of 2N2222 transistors would work nicely.
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Old 9th January 2013, 06:08 PM   #9
oz7aff is offline oz7aff  Denmark
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Quote:
Originally Posted by brucetassin View Post
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.
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Old 9th January 2013, 06:21 PM   #10
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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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