Re: New PP amp...
Posted: November 16th, 2014, 6:57 pm
charliewphelps@gmail.com wrote:Well..... I'm in the middle of taking an old time tube radio repair class which has been fun and has given me the courage to work on an old Fisher 500B that I inherited from a family friend. I've fixed a couple of old radios along the way which has been fun. To bad there isn't more interesting stuff on the AM band.
I'm also fiddling with a PP 845 amp. With 700 - 750 volts on the plates looks like I can get 30 -40 watts without trying to hard. Driver stage isn't as hard as it would be with a higher power amp and 700 volts doesn't scare me quite as much as 1200. Got a lot of experimenting to do though. I was hoping that with a PP amp you could use AC on the filaments and it would cancel out if you wire it in phase but it doesn't work as well as I hoped, sigh...... I'll have to talk with Dave B. about that RF filament supply.
Charlie
where are you taking this class, in Bowie?