Hi - I have a question about tube heater circuits ..
If I have dc filtered heaters, is there any way to 'elevate the voltage' similar to doing so with ac heaters and a tap off the hv ?
I've tried floating heaters .. with no connection to common ground .... very noisy for me .... I'm not sure if it's possible to 'reference' the dc heater to anything but a common ground (which of course, unfloats the heater circuit and references to 0V )
I ask because I like cathode follower type circuits ... which should have some heater elevation, such that the heater-cath max voltage spec isn't hopeflessly violated.
.... but I like dc filtered heaters on small signal tubes as well
Is there a solution .. to have a heater with one side at 70V and the other at 76V ?
or is it simply to run both schemes ... dc-filtered heaters for general stuff as well as ac-elevated heaters for any cf/cascaded small signal stuff ?
At present I just do dc filtered, but arrange things so as not to get too far from the spec .. and just 'don't worry about it'.
It does limit things a bit, tho'.
Am I not just misinformed ?
Thanks
Alex C
If I have dc filtered heaters, is there any way to 'elevate the voltage' similar to doing so with ac heaters and a tap off the hv ?
I've tried floating heaters .. with no connection to common ground .... very noisy for me .... I'm not sure if it's possible to 'reference' the dc heater to anything but a common ground (which of course, unfloats the heater circuit and references to 0V )
I ask because I like cathode follower type circuits ... which should have some heater elevation, such that the heater-cath max voltage spec isn't hopeflessly violated.
.... but I like dc filtered heaters on small signal tubes as well
Is there a solution .. to have a heater with one side at 70V and the other at 76V ?
or is it simply to run both schemes ... dc-filtered heaters for general stuff as well as ac-elevated heaters for any cf/cascaded small signal stuff ?
At present I just do dc filtered, but arrange things so as not to get too far from the spec .. and just 'don't worry about it'.
It does limit things a bit, tho'.
Am I not just misinformed ?
Thanks
Alex C