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Old 24th September 2009, 09:02 PM   #81
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You know me. I use whatever part I have too many of.

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Old 24th September 2009, 09:09 PM   #82
tms0425 is offline tms0425  United States
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Quote:
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You know me. I use whatever part I have too many of.

So that's why it looks like maybe two J109's per channel - you must have them all

A little old, a little new...
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Old 24th September 2009, 09:53 PM   #83
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Sony VFET paper from the AES.
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Old 24th September 2009, 11:02 PM   #84
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I do have a copy of that in pdf.

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Old 25th September 2009, 05:43 AM   #85
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Going to take your advice/proposal and buy some old V-FETs and give them a try. Hope I do not fry them the first thing I do...
I read somewhere (The Vintage Knob probably) that at least for the early V-FET amps (Yamaha B-2), one should not use a variac - dunno what Variac says about this....
V-FETs are depletion devices and normally on. Does it somehow have anything to do with this, or is it just bad engineering?

RK
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Old 25th September 2009, 11:51 PM   #86
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It depends. What topology were you thinking of?

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Old 26th September 2009, 12:30 AM   #87
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J2.JPG

I'm just wondering if these are the (2) J109 and (2) K170 discussed in the manual? Also, that 6 legged chip is still a mystery? What is the role of this chip in the circuit?


Last edited by fredlock; 26th September 2009 at 12:34 AM.
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Old 26th September 2009, 01:59 AM   #88
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Trying to tease information out of me. So naughty.

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Old 26th September 2009, 02:33 AM   #89
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Default 6-legged creature

Only 6-legged chips I can recall ever seeing are opto-couplers. Those others may be Magna-Fets, the wonder gain device.
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Old 26th September 2009, 08:07 AM   #90
Zen Mod is offline Zen Mod  Serbia
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Quote:
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Trying to tease information out of me. So naughty.

greedy kids


this time I'm not even thinking about J2 ;

I'll wait Papa's schm patiently to learn something new .
in fact - I'm curious just about that 6-legged critter

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