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In Reply to: RE: Good DIY Phonostages... posted by SoundMann on October 25, 2015 at 19:25:50
There's more than 1. Contact "inmate" Jeff Yourison for the implementation details of his build of the tweaked RCA setup (schematic) uploaded.
BTW, you'll have money left over to buy some LPs with. :>D
Eli D.
Follow Ups:
How does the mosfet follower affect the sound of this circuit?
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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