• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Using dht self bias resistor to lift idht front end heater


Paid Member
2004-02-01 2:58 am
I'm working on a srpp 6072 /vt52 headphone amp ala Rankin's bugle 45 and it occurred to me that since I already have 6.3VDC for the VT52 (sylvania) and I need to bias it up for the output tube anyway, why not just use it to heat the srpp so the top section of the driver does not exceed the rated heater cathode voltage.
Is there any potential problem with this scheme?
Is there any advantage to using a voltage divider from the B+ rather than the common heater supply?

Thanks in advance and sorry if this has already been covered,