I have come into possesion of a somewhat unusual wall-wart.
It will output DC 48V at 0.1A AND 6.9V at 0.8A!
This got me thinking that I could build a simple and safe (this would be my first project) linestage.
I saw the Aikido 24V project by John Broskie and that looks very interesting, however that design doesn't work for me because of the heater requirements.
My setup involves:
- 2 sources (CD and PC) which output 2V.
- power amp with 1.0V input sensitivity and 100K input impedance.
I would like to use the 48V as the B+ and the 6.9V (or lower) for the heaters. However given the 0.8A limit, I could only use 1 tube per channel.
I think cathode follower would be simple enough for me since I don't need gain, but I don't know which tubes to try.
Unfortunately most plate curve charts don't have great resolution at such low voltage/current so it's hard to tell what's linear.
The list so far is 12BH7 and 6DJ8. Any other candidates?
Jeff
It will output DC 48V at 0.1A AND 6.9V at 0.8A!
This got me thinking that I could build a simple and safe (this would be my first project) linestage.
I saw the Aikido 24V project by John Broskie and that looks very interesting, however that design doesn't work for me because of the heater requirements.
My setup involves:
- 2 sources (CD and PC) which output 2V.
- power amp with 1.0V input sensitivity and 100K input impedance.
I would like to use the 48V as the B+ and the 6.9V (or lower) for the heaters. However given the 0.8A limit, I could only use 1 tube per channel.
I think cathode follower would be simple enough for me since I don't need gain, but I don't know which tubes to try.
Unfortunately most plate curve charts don't have great resolution at such low voltage/current so it's hard to tell what's linear.
The list so far is 12BH7 and 6DJ8. Any other candidates?
Jeff