| Author: | Henry Ramsey (registered user: 2955 posts ) |
| Date: | Wed, Apr 18th, 2012 @ 19:27 ( . ) |
I'm trying a different approach. I rewired the second tube to the same 12V supply as the 12K5s. They're powered from the CT. (I was thinking this was 12VAC for some reason, but it reads 12VDC. ) I have the 6V regulator now only powering a single tube, for now a 12au7, but I may go to another 6V tube such as an EF86 that needs 200mA or a pentode/triode like a 6U8A which uses 450mA. Either way I've dumped some heat from the regulators. ;-) I realised too I was getting close to 1.7A of current draw from the PT only rated for 2A. This change also drops 150mA from that. The PT was humming when I had it on last night and I suspect the high current draw is why. Isn't there a rule of thumb to not exceed 80% of a PT ampacity? It's a 25.2VCT@2A transformer, btw from Radio Shack. |
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