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Old 9th January 2013, 06:37 PM   #11
Mooly is offline Mooly  United Kingdom
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2N2222's should work OK. You don't need change any components for using different transistors in this circuit. Make sure you identify the connections correctly... and if you have the choice get some more modern devices like the BCxxx devices mentioned. If your 2N2222's are metal encapsulated then that makes them less of a good choice due to possible pickup of noise and hash... which I guess in a phono stage is important.
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Old 10th January 2013, 03:32 PM   #12
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Originally Posted by brucetassin View Post
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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Old 10th January 2013, 04:37 PM   #13
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Tandbergeren,
Your offer is most generous, thank you but that will not be necessary. If you have a better schematic of a transistor riaa pre amp I would accept that.
I am retired and need something to keep my mind active so I decided to built
the EICO pre amp. I'm just having fun.
thank

Bruce
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Old 10th January 2013, 04:48 PM   #14
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Bruce since you have as you said available time you may evaluate for us sonic difference on various capacitors or semis ..now that can be of some use ...
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Old 10th January 2013, 04:54 PM   #15
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by brucetassin View Post
Tandbergeren,
Your offer is most generous, thank you but that will not be necessary. If you have a better schematic of a transistor riaa pre amp I would accept that.
I am retired and need something to keep my mind active so I decided to built
the EICO pre amp. I'm just having fun.
thank

Bruce
Have a search for the Radford ZD22 and HD250 amps. Classic all discrete single rail design and hard to better even today sonically.
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Old 26th January 2013, 12:56 PM   #16
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After some suggestions, I choose the transistors as indicated on the schematic.
I am very happy with the results, highs and bass are all present. I don't know how to evaluate the sound so I have no idea what the distortion is or even the frequency range. Having said that, it sound pretty good to my old ears.
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File Type: jpg eico-trans-pre2.JPG (31.0 KB, 27 views)
File Type: jpg eico-trans-pre3.JPG (73.2 KB, 27 views)
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Old 26th January 2013, 01:09 PM   #17
Mooly is offline Mooly  United Kingdom
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Thanks for the update. Pleased to see it worked out and you like what you hear Simple discrete circuitry can often sound surprisingly good.
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