I recall the price was about $25+ back when they were available out of Singapore.
People would probably pay twice that now.
People would probably pay twice that now.
Looks on the photo the same like my genuine Vfet's from Acronman Singapore
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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!
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!
4 pairs of VFETs on ebay:
4 pairs of 2SK60 + 2SJ18 V-FET transistors, Original Sony Japan NOS !!! | eBay
4 pairs of 2SK60 + 2SJ18 V-FET transistors, Original Sony Japan NOS !!! | eBay
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
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.
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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"Genuine" is the key word. I remember posts in one of the VFET threads documenting the disappointment of people ending up with fakes.
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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