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In Reply to: RE: Good DIY Phonostages... posted by Eli Duttman on October 25, 2015 at 21:29:50
How does the mosfet follower affect the sound of this circuit?
Follow Ups:
COMPLETELY transparent! The 'X7 triode is an excellent voltage amplifier, but it "can't fight its way out of a wet paper bag". The source follower allows the phono preamp to drive the awkward 10 Kohm IHF "standard" load. The RCA original needs a minimum load of 220 K. :> (
Yes, you can DC couple a cathode follower to the 2nd gain block, but you have heater current and heater to cathode potential limit concerns. Setting the FET up is pretty much a "no brainer". "Horses for courses."
The capacitances of the ZVN0545A are tiny. Even the wimpy 'X7 triode drives them with aplomb.
Eli D.
I built the RCA classic once. It was really soft sounding, like an old console system.
Lounge Audio LCR MKIII
http://www.newrecordday.com/lounge-audio-mkiii-lcr-phono-preamplifier/
Edits: 11/08/15
Morinix,
What other system components did you use when listening to the RCA phono stage?
Straight into a modified Masterlink ML9600 with a Madrigal DAP directly driving AKG 710 headphones. The ML9600 had a 1Meg input terminating resistor (part of my mods) so it was easy for the RCA Classic to drive.
Lounge Audio LCR MKIII
http://www.newrecordday.com/lounge-audio-mkiii-lcr-phono-preamplifier/
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