5AR4/GZ34/5U4/5Y3 SS conversion

Conversion using UF5407 800V 3Amp 2-Pin DO-2 Soft Recovery Ultrafast Plastic Rectifier Diodes in a standard octal plug with the cap off of a fabric conditioner bottle a perfect press fit to finish it off :D
https://cursorium.co.uk/images/ssr-1.jpeg
https://cursorium.co.uk/images/ssr-2.jpeg

chris_w_uk03-25-2021 5:56pm

chris_w_uk OP Details Discussions Posts This discussion Message User 52 posts 03-26-2021 at 08:58am Copy Comment URL Report Comment Edit Delete The B+ has gone from 300V to 325V and from 290V to 315V at the OP valve plates, so as it is cathode biased I'm not too concerned. I'll put the tester inline with one of the OP valves and see what the plate and cathode current is to see if it's within limits. The EL84s were only doing about 10.5 Watts before.
chris_w_uk OP Details Discussions Posts This discussion Message User 52 posts 03-26-2021 at 09:51am Copy Comment URL Report Comment Edit Delete Well it certainly looks different :^) https://cursorium.co.uk/images/ssr-3.jpg https://cursorium.co.uk/images/ssr-4.jpg
chris_w_uk OP Details Discussions Posts This discussion Message User 52 posts 03-27-2021 at 02:47pm Copy Comment URL Report Comment Edit Delete I have a thermsistor in the circuit, in fact two in parallel to slow it up even more. The Russian military EL84s in there will stand 315V and more with no problem, I have another amp that's been running them at 350V with no problem. Some commercially available amps run them way above 300V.