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Old 19th January 2019, 10:17 AM   #11
MEPER is offline MEPER  Denmark
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4 pairs of VFETs on ebay:
4 pairs of 2SK60 + 2SJ18 V-FET transistors, Original Sony Japan NOS !!! | eBay
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Old 19th January 2019, 10:21 AM   #12
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by MEPER View Post
Even an original 3055 in TO-3 is a bit expensive today:
ORIGINAL MOTOROLA 2N3055 BEST QUALITY TO3 POWER AMPLIFIER TRANSISTOR ad1x23 | eBay
I had a DIY integrated amp using these and the 2955 as output device.....many years ago. I remember that "high-end" people did not like 3055.....but the amp did play some nice music!
A couple of years back I bought in a 1980's Maplin 225WRMS amplifier which was missing output transistors 2N3055 and MJ2955.
So I bought some in and the amp oscillated quite badly.
I had to increase the VAS capacitor to stop the oscillation.
I can only guess the new transistors had higher gain and/or wider bandwidth.
maplinampsold | harrabylad | Flickr
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Old 19th January 2019, 10:39 AM   #13
MEPER is offline MEPER  Denmark
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Some (many) years back I built some Quad 405 power amps based on a cloned PCB. It also had some TO-3 housed output transistors (can't remember what it was) but at least one of the amps oscillated and it sounded very bad. At that time I knew an experienced "analog" electrical engineer. He solved the problem by putting a ferrite pearl on the base of the output transistors and everything was perfect. Then I did this on all the output devices just to be sure. I guess the ferrite pearl reduced the bandwidth a bit so phase margin came on the "good side". Apart from that it was a good sounding amp. It remember it had an opamp as input device.
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Old 19th January 2019, 06:02 PM   #14
fabrice63 is online now fabrice63  France
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Quote:
Originally Posted by Nelson Pass View Post
I recall the price was about $25+ back when they were available out of Singapore.
People would probably pay twice that now.
much much more am afraid

genuine ones are 100 dollars each at least , when you're lucky enough to find them.

which i haven't been lately


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Old 19th January 2019, 06:10 PM   #15
WBS is offline WBS  United States
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Hello Vfet V-fet people!
"Genuine" is the key word. I remember posts in one of the VFET threads documenting the disappointment of people ending up with fakes.
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Old 19th January 2019, 06:19 PM   #16
Nelson Pass is offline Nelson Pass  United States
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Hello Vfet V-fet people!
Quote:
Originally Posted by fabrice63 View Post
genuine ones are 100 dollars each at least , when you're lucky enough to find them..
So 400 x $100 = $40,000.

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Old 19th January 2019, 06:24 PM   #17
WBS is offline WBS  United States
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Hello Vfet V-fet people!
You would probably net more by selling your massive stash of Toshibas at today's prices.
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Old 20th January 2019, 04:25 AM   #18
Blk Dynamite is offline Blk Dynamite  United States
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Oh wow I had no idea. I got a pair of 2SJ28’s and 2SK82’s sitting in the closet. Guess I’ll be stashing these away for awh
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Old 20th January 2019, 04:16 PM   #19
vdi_nenna is offline vdi_nenna  United States
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Hello Vfet V-fet people! Send a message via Yahoo to vdi_nenna
I have eight 2Sk82s and 4 pairs of 2SJ28s and 2SK82s.
I'm not a fan of unobtainable parts.
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