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Original Message
update
Posted by vinnie2 on February 8, 2017 at 16:38:53:
well drat.... just doesn't seem to be my night. I hooked the halo up to the filaments of an 813, and got a bit of a glow from it, and it was measuring 4.5 volts on my dvm. I started taking loops off the torroid and got down to about 1.4vac with 4 loops left on the torroid. then I hooked it up to a 26 and compared the brightness of the filament to a 26 in my preamp that I know is set at 1.5 vdc and they looked pretty close. Decided to try it in the bread board and was rewarded with a loud hum, so decided to put the same 550uf cap in that I used on the halos for the 813's. Got that set up and when I turned the juice on there was a bit of a crackle and then silence. No glow on the filament any more. Could it be the cap is to big for this little guy? Pic attached. Looking at the picture I just thought of another possibility too. On the 813 halos there are 4 diodes in front of the greedn cap and the wires were attached to the back pair. Could it be these wires should be attached to the diodes behind the cap? If so, I have one left I can experiment with tomorrow. At least they were cheap; just wish it didn't take so darned long to get them.