If I put my notes here, I might be able to find them again later!
Marantz SR2285B Receiver : Phono Stage Model Response
Mid-range 1970's stereo receiver.
I was curious to find out a) what the phono circuit was, and b) how tight the RIAA response might have been.
The answer is "four transistors" and "pretty damn good", respectively.
We are impressed. These Japanese engineers knew a thing or two. I would like to see some of these old circuits resurrected as discrete phono stages with modern components to see just what they are capable of.
I was curious to find out a) what the phono circuit was, and b) how tight the RIAA response might have been.
The answer is "four transistors" and "pretty damn good", respectively.
We are impressed. These Japanese engineers knew a thing or two. I would like to see some of these old circuits resurrected as discrete phono stages with modern components to see just what they are capable of.
Total Comments 2
Comments
-
Wow, that looks simple and good!
Are there any suitable transistors in TO-92 or something thru-hole?Posted 31st March 2013 at 08:49 PM by 6L6
-
Well, it's simple at least...
It should also be reasonably tolerant of substitution of the transistors. TO-92 size will be fine, low noise preferable, the trick though is the originals are quite high voltage, -90 Vcbo from the front and -150 Vcbo for the rear set. Since the voltage rails total 80 V, this is not an optional requirement.
Perhaps someone could suggest some candidates. The 2SA992 2SC1845 come to mind...Posted 1st April 2013 at 08:47 AM by rjm
