Do you guys know a dual triode tube that can be used for a low power SE output stage?
I'm looking at say 50mA bias in class A with 20W anode Pa (per triode) max.
Jan
I'm looking at say 50mA bias in class A with 20W anode Pa (per triode) max.
Jan
All I can think of are 6336, 6080, 6AS7, 5998.
I know there are a few more like that, but I can't think of their numbers.
I know there are a few more like that, but I can't think of their numbers.
Those look like they would fit the bill George.
I'll check out the 6AS7 too, now that you mention it!
Jan
I'll check out the 6AS7 too, now that you mention it!
Jan
I think I can use any of these. The Va(max) is limited so I probably will use an OT with lower transformation ratio.
Hammond should have 2.5k to 4/8/(maybe 16) at say 10 or more Watts that would need an increase in my mortgage.
It's an experimental design, sims says it works great!
Jan
Hammond should have 2.5k to 4/8/(maybe 16) at say 10 or more Watts that would need an increase in my mortgage.
It's an experimental design, sims says it works great!
Jan
Matt from Cascadetubes has a nice design, disclaimer:I haven't tested it.
https://www.cascadetubes.com/the-6336-set-amp/
https://www.cascadetubes.com/the-6336-set-amp/
I forgot about the 6BX7 and 6BL7. My first color TV, a 1957 vintage Emerson built by RCA used the 6BL7 for vertical oscillator and output. The two triodes are identical but one is intended for oscillator duty hence the 10 watt per plate, but 12 watts total rating. Mu is 10 or 15 depending on the tube type.
The 6AS7 has a Mu of 2 and most of the regulator triodes are also rather low. The 7236 is the same tube with a Mu of almost 5. There is another one, but I can't remember the number at the moment.
Then, at the other end of the regulator triode spectrum there are the 7241 and 7242 tubes. These are big (100 watt plates), hard to find and often expensive. Mu of 2.7 or 10 if I remember right. I have seen one, but never played with one. There are three independent triodes inside a common plate structure. All are wired in parallel. They are about the size of an 813.
Electrical yes, but both triodes are in parallel internally so for practical use it's a single triode.
Jan
Jan
oops, you are right - sorry for the oversight! I was contemplating building a push-pull once with this one, but - like so many projects - the parts just lie there for years while I come up with new ideas 😀
could it be made to work by tying the cathode to ground, and apply a bias to the grid + modulation, do you think?