tmbg
Well-known member
ok so, I've been wanting to start building tube stuff for a loong time now, and I finally decided I'd give the ax84 p1 project a shot.
Their power supply specifies a 190v-0-190v @ 65mA plate transformer, they full-wave rectify that to 250V.
Ack radio, local to me, has the 125E output transformer that I haven't been able to find anywhere else, but they dont have that 269EX plate/filament trafo that the project uses, but they DO have the 261G6 transformer, that's 250VRMS CT @ 130mA and 6.3V @ 2A. Now, I imagine that I'd need to rectify slightly differently, but I ought to end up in the same ballpark, or somewhat higher voltage.
Their scheme is a dual rectifier (either silicon or valve) fullwave, so they turn the 190VRMS into ~250V after filtering, and then they use the center tap as ground, and stick the standby switch there.
With the 250VCT transformer, I could ignore the center tap, bridge rectify the 250VRMS, and get ~330V after filtering, that seems like it would work ok, but would that preclude the use of valve rectifiers? Or, could I use a pair of dual rectifier tubes to do that? In that case, where would I stick the standby switch? On the low-potential output leg of the bridge?
Is there another way to go about this that would work better? Am I better off holding out for a 190-0-190V transformer?
Ack also carries a 400-0-400, but I imagine this is way overkill for my needs.
Guys, give me some direction! I'm thinking about going down there on my lunch break, and I wasted most of the afternoon just thinking about how to compose this message!
Their power supply specifies a 190v-0-190v @ 65mA plate transformer, they full-wave rectify that to 250V.
Ack radio, local to me, has the 125E output transformer that I haven't been able to find anywhere else, but they dont have that 269EX plate/filament trafo that the project uses, but they DO have the 261G6 transformer, that's 250VRMS CT @ 130mA and 6.3V @ 2A. Now, I imagine that I'd need to rectify slightly differently, but I ought to end up in the same ballpark, or somewhat higher voltage.
Their scheme is a dual rectifier (either silicon or valve) fullwave, so they turn the 190VRMS into ~250V after filtering, and then they use the center tap as ground, and stick the standby switch there.
With the 250VCT transformer, I could ignore the center tap, bridge rectify the 250VRMS, and get ~330V after filtering, that seems like it would work ok, but would that preclude the use of valve rectifiers? Or, could I use a pair of dual rectifier tubes to do that? In that case, where would I stick the standby switch? On the low-potential output leg of the bridge?
Is there another way to go about this that would work better? Am I better off holding out for a 190-0-190V transformer?
Ack also carries a 400-0-400, but I imagine this is way overkill for my needs.
Guys, give me some direction! I'm thinking about going down there on my lunch break, and I wasted most of the afternoon just thinking about how to compose this message!
