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Old 14th October 2008, 10:48 AM   #121
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HI Salas I have put a 7,22 idss without resistor , and I have 6.7 Vds ,too low ?

sound good ,but are some day that I don't play ...nexts on second stage
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Old 14th October 2008, 01:24 PM   #122
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can I go to 26v ?
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Old 14th October 2008, 07:10 PM   #123
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What you get is normal. Go for 25V I would rather predict for a VDS around 8V.
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Old 14th October 2008, 07:19 PM   #124
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Default Re: Re: Cascode

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Originally posted by salas


What do you think that it must be done differently in your experience?

Thank you in advance
Since Mad_K did not catch up yet, I reply to myself.

The BC550 base bias voltage divider got some additional filtering and the collector voltage had to go higher. I want to know more of Mad_K's subjective impressions about the cascode performance boost in this kind of circuit.
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Old 14th October 2008, 07:21 PM   #125
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Thanks Salas

I have done the second stage ,all sound better I feel a little lower sound stage but not sure ....
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Old 14th October 2008, 09:29 PM   #126
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Maybe your sound stage came back as you knew it after they warmed up and played for a while? Also if you don't get very good matching for VDS on all FETs after 30mins (the stronger their Beta, the easier the variation for current), they are going to slightly mismatch the level between channels. Not good for stereo perception. Maybe you can trim for VDS matching with very little value different Rs.
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Old 14th October 2008, 10:42 PM   #127
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only for 8min but 7,233 7,230 .... i thinks in the end the soundstage as same GR , but when I have a mix bl on 1stage and gr on second the speaker are totally disappeared with a touch 2HD romantic... nice.

But I 'm happy for gain and sound ,not arrived cartridge and minireg
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Old 21st October 2008, 12:20 PM   #128
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THANKS A LOT SALAS

The 0,5mv black K work fine, I only use 60-70% voume
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Old 29th October 2008, 08:30 PM   #129
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I see that amplabs.com has 2sk170bl at 20 pieces for $20. Are 20 pieces enough to ensure that I can get 4 pieces that match? I have no idea how variable the Idss is on these things.
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Old 29th October 2008, 08:39 PM   #130
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the important are R-L match ..... a two different match pair are ok
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