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Old 21st July 2006, 09:00 AM   #11
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Err.... Who is Mr. Pass?
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Old 21st July 2006, 09:08 AM   #12
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Quote:
Originally posted by jasonlky

Err.... Who is Mr. Pass?

He looks like
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Old 21st July 2006, 07:21 PM   #13
flg is offline flg  United States
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Err...Who is Papa I think you may find something in the US Patent Office If your looking for "Pass"
I think you may score a few hits on any search engine
Not to forget, passdiy.com firstwatt.com and passlabs.com
And, you may find countless publications, highly praising his work...
You may even notice the title of this Forum Catagory
Without Mr. Pass... We would all be in the Solid State Forum??? Who is Mr. Solid State?
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Old 21st July 2006, 11:32 PM   #14
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Hi,
that was exactly that kind of answer I hoped for: I tried, but something else seems to be better.

In quite a few MC-phono amps, we have a SE FET as first stage, sometimes cascoded, sometimes paralleled.

If we look at the ono's first stage, which is cascoded and is fed by a cap multiplier: is a aleph-style CCS beneficial or not? Might be worth to try...

thanks,
Rüdiger
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Old 24th July 2006, 03:41 PM   #15
Stefano is offline Stefano  Italy
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Default j-fet pre

Are you thinking to use lovoltec power fet for the pre?
Is it possible to replace the IRFP610 with a cascoded j-fet?
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Old 24th July 2006, 03:54 PM   #16
steenoe is offline steenoe  Denmark
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Quote:
Are you thinking to use lovoltec power fet for the pre?
I had the Toshiba devices in mind The BoZ and the BosoZ were tuned at getting the best from a Mosfet, in this case IRF610's. I doubt that a Lovoltech is a direct plugin replacement.
The BoZ and BosoZ with their high'ish railvoltages, are dedicated to get the best from a mosfet.

Steen
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Old 24th July 2006, 06:29 PM   #17
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Default Re: j-fet pre

Quote:
Originally posted by Stefano
Are you thinking to use lovoltec power fet for the pre?
No, I my first try would be the 2sk170, small signal low noise fet from toshiba, well known in this forum. A 2sk369 should work if you need gain.
Rüdiger
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Old 24th July 2006, 08:34 PM   #18
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I think the lovoltechs make their magic with low voltage and around 2 amps of current, so not likely a good candidate for a preamp unless you want to run it at power amp levels. The smaller jfets have less input capacitance too.
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Old 24th July 2006, 09:01 PM   #19
MRupp is offline MRupp  Germany
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Default Lovoltechs vs. other JFets

The Lovoltechs have a triode / resistive region up to around 4V and in the Zen V9 they are operated exactly in this region. Maybe this region is even higher at lower currents It might be still be a good idea to try a preamp with the Lovoltechs, and the low voltage isn’t an issue if you use them in a cascode circuit.

And there are countless preamp circuits around using SK170s so you would have to be very creative to come up with something that hasn’t been tried before.
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Old 9th January 2008, 11:52 PM   #20
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I'm bringing back this thread because I have a question that might have been raised (and answered) here, but I'm not sure.

Might the LU1014 serve well as the cascode device (replacing the mosfet) being controlled by a SK170 or the like? I'm thinking about this for a preamp (mc phono, to be precise) and not for the input stage which might be a transformer.

Might this be possible (does it have the, uh, guts)? Would it provide any benefit over the mosfet?
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