Allen has publicly disclosed his FVP5 and RTP3D designs. In fact, the front end of his RTP3D (using the MAT02 transistor that he mentions in TPCB2), is the prototype for the input stage of my phono section these days. The FVP5 is single-ended and the RTP3D is balanced. So far as I know he has not messed around with an LCR equalization stage. I've never heard the RTP3D or later version per se, but based on my own results with a facsimile of its phono gain stage, I would predict it is one fabulous piece. He uses a pair of resistors between the emitter(s) of the bottom transistor(s) (MAT02 or other) in the input dual-differential cascode and the CCS to control total phono gain. (Believe me, with the MAT02, which has a Gm of 500!!!, you will have gain up the wazoo.) The FVP5 would be easiest to build and may be all one needs for great MM reproduction. Does he sell it as a kit?
Dedicated phono-pre for MM only?
Hi All,
the subject of phono-pres, specifically 'adapted' to MM came up in some related postings.
IF, and only if, MMs are much to ones liking --- why spend your buck on some 'halve backed' 60dB plus, MC gain requirement, stage? Why not consider put the $$$ into a TOP 40dB gain stage of either SS or tube?
Raul had more thoughs on the subject as he mentioned before, and might share, why he knows that a TOP MM compared to MC stage circuit requirement might NOT be -one suit fits all-.
There could even be a nice argument to fit a tube gain stage only into an otherwise SS only system!?
Again, the $buck saved on the 20dB plus circuitry could be translated into the BEST circuit for an MM.
I realise, that most such stages were simply fitted inside some older TOP pre-amps, (e.g. Jadis...).
I have not come across a **dedicated** , current 40dB stage neither in nor outside a pre-amp.
Thank you,
Axel
the subject of phono-pres, specifically 'adapted' to MM came up in some related postings.
IF, and only if, MMs are much to ones liking --- why spend your buck on some 'halve backed' 60dB plus, MC gain requirement, stage? Why not consider put the $$$ into a TOP 40dB gain stage of either SS or tube?
Raul had more thoughs on the subject as he mentioned before, and might share, why he knows that a TOP MM compared to MC stage circuit requirement might NOT be -one suit fits all-.
There could even be a nice argument to fit a tube gain stage only into an otherwise SS only system!?
Again, the $buck saved on the 20dB plus circuitry could be translated into the BEST circuit for an MM.
I realise, that most such stages were simply fitted inside some older TOP pre-amps, (e.g. Jadis...).
I have not come across a **dedicated** , current 40dB stage neither in nor outside a pre-amp.
Thank you,
Axel
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- 120 posts total
- 120 posts total