In Reply to: Re: 45 parafeed SET vs. 845 transformer-coupled PP posted by Kurt Strain on June 14, 2000 at 12:51:37:
Well, our lowly 900V power supply forced us to run the direct coupled 845 at a low Vp and therefore we didn't need too much driver swing. We used the arrangement I published for a 45 SE parafeed back in '97, where we feed the top of the CCS from the cathode of the output tube, so the CCS only saw 300V at the input. Of course wity this arrangement you probably get a bit less swing from the driver stage than the grid of the output tube needs to hit 0V, but it seems a decent compromise if power output isn't the number one priority, and you get some protection from B+ overvoltage on startup stressing the CCS.I guess I'd say that it's an interesting experiment if you have the parts sitting around, which we did, but if you are happy with a 45's power, I don't suspect you will hear any thing that much better, besides just more loud. And of course an 845 demands some hum reduction work because of the 10V filament.
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