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Old 9th January 2014, 02:46 AM   #21
DustyC is offline DustyC  United States
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Now that Sony's fired the 1st salvo (with Nelson lighting the fuse) I wonder if Yamaha will return fire? (said the former B-2 owner)
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Old 9th January 2014, 08:56 AM   #22
juma is offline juma  Germany
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Quote:
Originally Posted by OllBoll View Post
... How do you solve biasing, are they all super matched ...
Source resistors:
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Old 9th January 2014, 09:28 AM   #23
Mooly is offline Mooly  United Kingdom
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What's the score with these devices offered for sale today ? Only reason for asking is curiosity. Are these devices being copied somewhere (such as by the like of ISC, ) or is there actually a lot of new old stock around ?

Littlediode seem to have them at around 40 each and available in quantity.
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Old 9th January 2014, 01:50 PM   #24
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Congrats Nelson. It is nice to hear of old tech being reborn. I bet they sound even better than they look...
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Old 9th January 2014, 02:04 PM   #25
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by Nelson Pass View Post
Monoblock. 32/ch

$44/pair, need $1.4k just buy those VFET I wish that my calculator give me discounted number.

But PaPa, have you bought all acronman's stock? I'm glad that 2pcs 2SK82 are on my drawer
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Old 9th January 2014, 02:41 PM   #26
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Quote:
Originally Posted by Blues View Post
did Sony commission you to build these or you just have a lot of Sony SITs in storage needing a special project?
I told Sony about it as the design was completed. It just seemed like the
best use of the parts.

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Old 9th January 2014, 02:44 PM   #27
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Quote:
Originally Posted by OllBoll View Post
Crazy =)

How do you solve biasing, are they all super matched so you can use one bias supply per side?

And on the topic on supply, do you know if they will manufacture more VFETs, possibly new modern ones?
I matched them to about 5% of each other. The bias voltage is quite high,
on the order order of -10V and the whole thing has to be regulated due to
the characteristics of SITs. The biggest trick is to get the bias voltage
in place before power gets to the VFETs or they conduct a lot of current.

I am not aware of any intent on the part of Sony to produce more VFETs.

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Old 9th January 2014, 02:46 PM   #28
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Quote:
Originally Posted by juma View Post
Source resistors:
Those are .05 ohm Drain resistors, used to confirm bias figures. They are not
actually needed, but this was not known when I designed the output stage
pc board.

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Old 9th January 2014, 02:48 PM   #29
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Quote:
Originally Posted by gadut View Post
$44/pair, need $1.4k just buy those VFET I wish that my calculator give me discounted number.

But PaPa, have you bought all acronman's stock? I'm glad that 2pcs 2SK82 are on my drawer
Acronman still has some. I am testing mixed ranks of P and N for them to
confirm their operation together.

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Old 9th January 2014, 02:52 PM   #30
massimo is offline massimo  Italy
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Quote:
Originally Posted by Nelson Pass View Post
It just seemed like the best use of the parts.
No doubt!
Any chance to see a simplified schem one of these days?
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