In Reply to: RE: Rectifier choices for 650v HT posted by Thomas Mayer on June 30, 2012 at 02:42:33:
Hi Thomas,
Thinking about a SE amp using a transmitting triode instead of the usual 300b. Choices - 211 and 845 are expensive, 813 is big and greedy, so looking for some cute options a bit off the beaten track.
Looks like the 814 is interesting and good value. There's also the 828 but that's rare and pricey - virtually the same but just a bit more poke. Radio hams still have some 814s in odd boxes. It's never been popular. Is there something I should know about using this tube? Looks good in triode.
So current would be about 60mA for each 814. Add 20mA for a driver and 5mA for an input tube and total would come in at under 200mA for a stereo amp. I don't see it needs over 650v HT for a typical domestic room with fairly sensitive speakers.
Once an amp was built it would be possible to play around with other transmitting tubes. I use a modular chassis anyway, so can swap output top plates without disturbing the rest of the amp.
Andy
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Follow Ups
- Current needs... - andy evans 03:08:56 06/30/12 (1)
- RE: Current needs... - Thomas Mayer 03:21:24 06/30/12 (0)