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Old 12th January 2009, 03:21 PM   #591
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Led ?
http://search.digikey.com/scripts/Dk...8&keywords=led
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Old 12th January 2009, 04:09 PM   #592
Salas is offline Salas  Greece
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1.7V get those
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Old 12th January 2009, 04:39 PM   #593
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Old 12th January 2009, 06:14 PM   #594
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voltage drop are 10v ?

40vac trafo can find only for 300VA too much for 100ma......

35Vac on 160VA range 60-70

if I remeber well Mc intosh/MF used a sort dirty diode voltage multipler ? just for try with my 30vac....
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Old 12th January 2009, 06:27 PM   #595
Salas is offline Salas  Greece
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You need 40VAC so to get about 44V Vout and a good Vin margin. Don't let it go less than 7V Vin-Vout.
Can't you ask for any custom one from an Italian source?
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Old 12th January 2009, 07:55 PM   #596
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HI All

Part list digikey for dual rail +/- ,in 56Vdc out 44Vdc

4 P15W-2BK-ND 15r 2W 5% (100ma CCS)
4 P6.8W-2BK-ND 6r8 2W 5% (200ma CCS)
4 MPSA55GOS-ND
4 MPSA05GOS-ND
4 P470CACT-ND RES 470 OHM 1/4W 1%
4 CMF10.0HFCT-ND RES 10.0 OHM 1%
4 P47.0CACT-ND 47.0 1/4W 1%
4 P56.0CACT-ND 56.0 1/4W 1%
4 CMF1.00KHFCT-ND 1.00K 1%
4 CMF221HFCT-ND 221 1%
4 CMF33.2KHFCT-ND 33.2K 1%
4 CMF56.2HFCT-ND 56.2 1%
4 CMF47.5QFCT-ND 47.5 1%
4 IRFP240PBF-ND
4 IRFP9240PBF-ND
4 604-1065-ND CAP 100UF 35V
4 P10343-ND CAP 100UF 63V
4 1N4755ADICT-ND
12 67-1122-ND LED
2 BC550CGOS-ND
2 BC560CTACT-ND
Add for C4
4 470->1000mf 63v the best you can find as DR Salas suggest
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Old 12th January 2009, 09:05 PM   #597
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Hi Salas,

why is the coupling C1 value so high ... 100-120nF?
Thorsten suggest only 10nF here.

Carsten
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Old 12th January 2009, 09:15 PM   #598
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Sorry double component

delete
4 P47.0CACT-ND 47.0 1/4W 1%
4 P56.0CACT-ND 56.0 1/4W 1%

or live this panasonic and delete the Dale.....
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Old 12th January 2009, 09:23 PM   #599
Salas is offline Salas  Greece
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Carawu:

Thorsten maybe sees higher second stage input impedance. If you want to use 10nF, the phase in the lows will start turning soon enough. Many engineers warn against early phase twist. Its a matter of what quality of coupling cap you have access to and how low your speakers go in practice I would think. It will also filter more acoustic feedback on the arm. It certainly will not cut some substantial audible spectrum (-1.5dB@20Hz) and if you have an excellent 10nF you may very well try it.
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Old 13th January 2009, 10:31 PM   #600
iko is offline iko  Canada
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Hi guys,
I had definite plans on tackling a tube phono stage next, and well, I'll have to blame you guys for doing such a good job that I'm delaying the tube project and will do this one next, instead. the sk170 are yet to arrive. I'm hoping the MCM manufactured ones from Newark don't totally suck. One question though, since this is my first foray in jfet land, do the jfets need to be matched position-wise (left-right channel correspondence)?

I have a Grado black, so it's the MM version publised here that will get done, and for the psu I'll probably start with a couple of 12V batteries in series, then move up to a proper supply.

Anyway, salas, great job, thanks for keeping this going and improving it all the time.
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