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Old 2nd July 2010, 08:42 PM   #4051
Salas is offline Salas  Greece
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Just listen to them without expectations, because expectation is a powerful mind drug. Time will tell.
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Old 2nd July 2010, 08:51 PM   #4052
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No expectations, I owned Hovland polypropylenes & aluminium foil & now I have Obbligatos also poly + alu foil, I own Mundorf poly + tin foil so more or less I know the sound & always is better 1st de dielectric & after the foil: 1st foil copper, 2nd aluminium & 3rd tin (I don't know any teflon film & silver or gold foil)

Yes I need a lot of TIME more or less about 400 hours to break-in well all teflon foils as per information I got in the net.
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Old 2nd July 2010, 08:59 PM   #4053
Salas is offline Salas  Greece
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Don't know about so many hours, those rules of thumb come from enthusiastic audiophiles without controls around their listening sessions and lots of gear and set up tweaks along that time. But I know that a good day shows early in the morning, and you are sure its sunny by noon.
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Old 2nd July 2010, 09:00 PM   #4054
le´flu is offline le´flu  Germany
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Hello salas and all,
i´ve been absent to this thread quite a while but i´m still interested in building
this pre. Postings and pages are a lot and searching schematics would be awful.

Would anyoney be so kind and post the actual njfet RIAA for cartridges like
lyra dorian and the like? And please add salas reg psu schematics once again
if available.

Aaaand please tell me what IDSS would be ideal for the fets

Thanks and greetings

ulf
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Old 2nd July 2010, 09:03 PM   #4055
Salas is offline Salas  Greece
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What Idss is most common in your 2SK170 stash?
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Old 2nd July 2010, 09:10 PM   #4056
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by merlin el mago View Post
About new contact surplus teflon caps I can confirm that are aluminium foil, I asked if they have 0.015uF & 0.047uF for RIAA + 2.2uF output cap, also they can serve matched pairs, more news as soon as possible.
Sounds very good !
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Old 2nd July 2010, 09:12 PM   #4057
le´flu is offline le´flu  Germany
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Salas,
don´t know yet. Have around 70 sk170 in my box but did not measure idss
until now

greetings
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Old 2nd July 2010, 09:15 PM   #4058
Salas is offline Salas  Greece
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Measure first, see where your batch averages, find 3 pairs and let me know to give you the best values on a le 'flu cut to measure CCT. Is the Dorian your main cart? 0.6mV 10R Zo?
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Old 2nd July 2010, 09:27 PM   #4059
le´flu is offline le´flu  Germany
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Hi Salas,
i´m using two tonearms. One with Lyra Dorian which makes 0,60 mV
and another Tonearm where i can use Denon dl103 or AT33ptg. But
there i use a Valve Phonostage. Still on the hunt for a better partner for
the Dorian.

Greetings Ulf

P.S. what is the best way to measure idss? I´ve got a schematic from the
preamp cookbook by A. wright with constant current lm317
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Old 2nd July 2010, 09:35 PM   #4060
Salas is offline Salas  Greece
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To me the most simplistic but sure way proved to use a 9V battery (+) in series with a good DVM's red probe in mA setting, black probe to drain, gate and source shorted and back from there to battery (-). Waiting for each reading to stop climbing, noting down on a white A3 paper, sellotape, stick the bug above the reading, make em an army, look for numbers afterwards and forever without mixing. A breadboard will help a lot, not to touch them much (they get upset), and avoid shorts that will blow DVM's fuse, they are tiny thingies. The 100R between drain and battery method and voltage taken across R, deriving mA was near but always a bit short, they tended to pull a bit harder when in circuit.
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