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Title: Valiant Plate TFMR Post by: stevef on November 06, 2005, 06:27:44 PM While deconstructing my Valiant - I notice the plate transformer is likely not the original. It is a Geo. Sturley, 118:1800 CT @ 0.5 Amp.
Dahl's Valiant replacement is a 120:1520 CT @ 0.4A. I do not know what the original tfmr specs are. In any case, if I beef up the filter caps appropriately, will the extra 100vdc or so on the 6146B plates hurt anything? Or am I asking for trouble and should choke/divide the B+ down to the "spec" 600v.? Tnx, Steve KK7UV Title: Re: Valiant Plate TFMR Post by: WA1HZK on November 10, 2005, 03:28:56 PM Don't sweat it. Just make sure the bias voltages are set for the correct resting currents. I run 1100 volts on my 6146 Modulators in my valiant and they don't show any problems.
Keith Title: Re: Valiant Plate TFMR Post by: stevef on November 12, 2005, 09:44:07 PM 1100 volts! So much for tube spec sheets. I think the highest max plate voltage I could find is like 600 CCS/750 ICAS. Obviously there is some other reason besides plate voltage that causes them to fail or weaken prematurely? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Steve KK7UV |