They look sensible money and decent stock in a month (fingers crossed), so may well go with them.I'm using the MJL3181a which are apparently really good!
Not quite finished the build yet, so can't vouch for them, but lots of good reports on the net.
https://cpc.farnell.com/on-semiconductor/mjl3281ag/transistor-npn-to-264/dp/SC06820?ost=Sc06820
Hi GrogI'm hoping my small case will have enough heatsinking.
The boards are attached to a 6mm thick 100mmx200mm heat spreader, which is bolted to the outer aluminium extrusion.
I've also put TR5 under the board so much closer to the heatsink than in the usual position.
Hi GrogI also have some NJW21194G which are a reasonable substitute.
I have a number of these that I pulled from some work amplifiers with faulty input stages.
I can send a few, for a charity donation.
Probably take a few days to get round to test them
Let me know if that helps.
Hi Grog
Why did you not turn the legs of the transistors through the holes in the PCB so you get better contact with the actual copper track instead of bridging the interface between the transistor and PCB with a solder bridge ?
Alan
I havn't currently, but not yet bolted together, just a dry fit.Hi Grog
Did you use thermal paste between the side heat sinks before bolting them together, it will help with heat dissipation
Alan
I built something similar: https://pinkfishmedia.net/forum/posts/4357478/Where is everyone sourcing their transformers?
Has anyone tried a switch mode supply? I'm looking at the meanwell PID-250D, two of those would give 46-52v rails ( output is trimmable) and a 4.75-5.25 rail to put on top, giving a potential 50v pair and 55v pair of rails.
Tnyone tried similar?