As above, I've always been happy with point to point. But I'm a fan of "long tubes life". I go with those who prefer a 300b dissipation of 25W or even 18W. In fact I prefer to use 2a3s myself at 15W, or EL12n at 18W.
Right, the extra cost of the rectifier tubes is also a concern for me. But don't forget the extra power coil and circuit for soft start of this tube if you want to extend the life of this tube. They also complicates the overall circuit.
Even with the use of a rectifier tube, the B+ is not regulated, I still need to use a LM317, so it doesn't help a lot. I'm doubtful if anyone can hand wire nearly 200pcs of components ...
That’s a beautiful build. Congratulations!
Building with 300B is such an investment nowadays, you might as well do it very right.
Because they have some features that others do not have:
You can actually refer to the application note of LM317 from TI, there is a reference schematic for soft start (i.e. slow turn ON).
DISCLAIMER: High voltage can be lethal, I'm not responsible for any damages that result from the use of this schematic.
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These amps are gorgeous...sorry if I should know the answer to this but are you selling these or just making them for yourself?
That's so impressive. I'm new to this stuff but hoping to study circuits and tubes more when I retire and maybe try to build something like that though I doubt I'll ever be able to make something that good...or that looks that good.
How reliable are these switching mosfets under linear operation? These are 10ms champs in the SOA but how do they do at 200mA 400V?
https://www.mouser.com/datasheet/2/389/std3n62k3-1850520.pdf