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Title: Driving 811A grids from Eico 730 Post by: nq5t on January 08, 2007, 11:05:07 AM I want to drive a pair of 811A's from an Eico 730. The 730 does not have a center tapped output on the mod transformer, but it does have an unbalanced 500 ohm output. I was thinking about driving a Hammond 1650G audio transformer backwards -- using the 500 ohm output tap as input, and the 6600 ohm CT input of the transformer to drive the tubes, feeding bias through the CT.
Is this a good idea? Is there a better way to go about this? Grant/NQ5T Title: Re: Driving 811A grids from Eico 730 Post by: 2ZE on January 08, 2007, 12:10:04 PM Sounds FB to me. I use a commercial audio amp's 70 volt (500 ohm) output to drive my various rigs here. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Just be careful of the audio level out of the 730 and Rf getting into the unbalanced audio. |