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Old 21st June 2011, 11:27 AM   #51
mr l is offline mr l  Australia
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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!
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Old 22nd June 2011, 10:12 AM   #52
Dzius is offline Dzius  Poland
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Realy retro-tech design.
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Old 22nd June 2011, 01:12 PM   #53
h_a is offline h_a  Europe
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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
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Old 23rd June 2011, 02:36 AM   #54
mr l is offline mr l  Australia
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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.
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Old 27th June 2011, 11:33 AM   #55
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Grados are moving iron.
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Old 28th June 2011, 12:46 AM   #56
mr l is offline mr l  Australia
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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).
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Old 28th June 2011, 09:02 AM   #57
gk7 is offline gk7
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Like h_a already said in post #53 moving iron systems are (relatively) insensitive to capacitance loading, unlike MMs (and Transformers btw)
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Old 28th June 2011, 09:43 AM   #58
mr l is offline mr l  Australia
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are you guys trying to threadjack? because I'm seeing nothing constructive. maybe it's time to build another preamp.
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Old 25th August 2011, 09:46 AM   #59
Cobra2 is offline Cobra2  Norway
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Default MOSeiden phono stage

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
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