I find myself in possession of most of the parts for a 2016 SONY VFET amplifier.
I picked up PCBs here that were populated originally for use with K60/J18 devices…of which I have a few.
However, in searching for a pair of the special mounting brackets used with this amp project I also acquired a pair of J28 KF33 VFETs here in the swap meet.
They were originally from
CircuitDIY Acronman according to the seller.
Not curve traced. No Vgs written on them. I’d have to figure out the testing procedure to determine Vgs.
Still, I’d like the opportunity to assemble the amp as NP originally designed it.
To my knowledge NP never curve traced the VFETs. My understanding is he measured the Vgs of the devices and then I suppose he tried to put together pairs of the K82/J28 that would avoid any serious operational problems in the circuit.
I’m looking for a pair of K82 that would work with the J28 KF33 I have properly in the circuit.
I’d be willing to buy them outright or would consider other options such as trading for some of the K60/J18 devices I have which are perfect for the SONY VFET Part 3 OS project.
I would also consider buying K82/J28 pairs if there is someone who has them from a reputable source that never got to building with them.
Again, I don’t feel obligated to have curve traced matched pairs.
In the event that someone does have some special curve traced matched pairs of K82/J28 and they are interested in a trade then I might consider offering some Semisouth R100 curve traced matched pairs that I have hoarded in exchange.
I picked up PCBs here that were populated originally for use with K60/J18 devices…of which I have a few.
However, in searching for a pair of the special mounting brackets used with this amp project I also acquired a pair of J28 KF33 VFETs here in the swap meet.
They were originally from
CircuitDIY Acronman according to the seller.
Not curve traced. No Vgs written on them. I’d have to figure out the testing procedure to determine Vgs.
Still, I’d like the opportunity to assemble the amp as NP originally designed it.
To my knowledge NP never curve traced the VFETs. My understanding is he measured the Vgs of the devices and then I suppose he tried to put together pairs of the K82/J28 that would avoid any serious operational problems in the circuit.
I’m looking for a pair of K82 that would work with the J28 KF33 I have properly in the circuit.
I’d be willing to buy them outright or would consider other options such as trading for some of the K60/J18 devices I have which are perfect for the SONY VFET Part 3 OS project.
I would also consider buying K82/J28 pairs if there is someone who has them from a reputable source that never got to building with them.
Again, I don’t feel obligated to have curve traced matched pairs.
In the event that someone does have some special curve traced matched pairs of K82/J28 and they are interested in a trade then I might consider offering some Semisouth R100 curve traced matched pairs that I have hoarded in exchange.
These are the TH51s I got from Watanabe on eBay. Bought them prior to him feeling compelled to offer any matching.
Good for several different projects…SissySIT etc
Good for several different projects…SissySIT etc
I’d only give some of these up for matched K82/J28 pairs. As you can see in the pic, I have the curve trace data printouts for pairs…and there’s even a quad that fell into the matching parameters.
These were sourced from kinku who organized a couple of group buys for F2/F2J boards and related transistors.
I ended up buying most of the last group buy.
