Phono for Bride of Zen - Page 6

mr l · 21st June 2011, 11:27 AM

finally finished my preamp, using teflon caps for the riaa. running the preamp off 2 sla batteries and using a meanwell switching psu as a charger. soundwise i'm impressed! sounds clean, noise floor higher but i can live with that!

Dzius · 22nd June 2011, 10:12 AM

Realy retro-tech design.

h_a · 22nd June 2011, 01:12 PM

By the way, I hope you use a moving iron pickup with that phono stage. Having a big mosfet at the input brings a large loading capacitance (Cis) that will roll of the tremble of an ordinary MM (remember recommended loading capacitance of the manufacturer! Usually quite a bit smaller than the Cis of a regular power mosfet.).

Otherwise, enjoy! Hannes

mr l · 23rd June 2011, 02:36 AM

hmm, I use a grado prestige gold mm cart, upgraded stylus, with no problems. this setup sounds far better than the commercial phono amps I've owned. almost matches my modified linn karik for sound quality. you could do a lot worse than a IRF610 when it comes to gate capacitance, the secret is proper biasing.

gk7 · 27th June 2011, 11:33 AM

Grados are moving iron.

mr l · 28th June 2011, 12:46 AM

and? moving iron are a variation of MM. so, build the preamp and see what you think. i'll be trying MC cart next (with transformer of course).

gk7 · 28th June 2011, 09:02 AM

Like h_a already said in post #53 moving iron systems are (relatively) insensitive to capacitance loading, unlike MMs (and Transformers btw)

mr l · 28th June 2011, 09:43 AM

are you guys trying to threadjack? because I'm seeing nothing constructive. maybe it's time to build another preamp.

Cobra2 · 25th August 2011, 09:46 AM

Built, playing now...
Sounds good, actually better than expected.
And less noise than expected too!
BUT, gain is a bit too low for my system, with passive/buffer-pre.
Maybe a single JFet in front would been perfect..?
( + another 6-10dB)

Arne K

27th June 2011, 11:33 AM	#55
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	Grados are moving iron. __________________ Regards, Georg

28th June 2011, 09:02 AM	#57
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	Like h_a already said in post #53 moving iron systems are (relatively) insensitive to capacitance loading, unlike MMs (and Transformers btw) __________________ Regards, Georg

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22nd June 2011, 10:12 AM	#52
Dzius diyAudio Member Join Date: Sep 2010 Location: Warsaw	Realy retro-tech design.

22nd June 2011, 01:12 PM	#53
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	By the way, I hope you use a moving iron pickup with that phono stage. Having a big mosfet at the input brings a large loading capacitance (Cis) that will roll of the tremble of an ordinary MM (remember recommended loading capacitance of the manufacturer! Usually quite a bit smaller than the Cis of a regular power mosfet.). Otherwise, enjoy! Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

23rd June 2011, 02:36 AM	#54
mr l diyAudio Member Join Date: Dec 2003 Location: qld	hmm, I use a grado prestige gold mm cart, upgraded stylus, with no problems. this setup sounds far better than the commercial phono amps I've owned. almost matches my modified linn karik for sound quality. you could do a lot worse than a IRF610 when it comes to gate capacitance, the secret is proper biasing.

28th June 2011, 12:46 AM	#56
mr l diyAudio Member Join Date: Dec 2003 Location: qld	and? moving iron are a variation of MM. so, build the preamp and see what you think. i'll be trying MC cart next (with transformer of course).

28th June 2011, 09:43 AM	#58
mr l diyAudio Member Join Date: Dec 2003 Location: qld	are you guys trying to threadjack? because I'm seeing nothing constructive. maybe it's time to build another preamp.

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