|[AMRadio] Amplifier with input drive to screen grid|
bill.fondren at sbcglobal.net
Tue May 23 08:43:55 EDT 2006
I recently traded for a linear that has a strange input circuit, at least to me. The amp is built in a 18 " Bud rack mount cabinet weighting about 150 lbs. To heavy for 1 person to handle so I deceided to split the RF deck from the power supply and put it in a taller cabinet along with the exciter. No info was with the unit. I have used it a couple of times and it works fine . It uses a pair of 813's in parallel. I started to draw out the circuit finding that the drive goes to a tuned circuit and then to the sceen grids of the 813's. The control grids are connected together and go to a 10K resistor, the grid current meter and then to grd. No connection to the drive circuit at all other than the interelectrode cap. I guess. The plate circuit seems to be normal. Just wondering if any one has seen something like this before. Bill K5PML
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