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Using dht self bias resistor to lift idht front end heater
Using dht self bias resistor to lift idht front end heater
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Old 26th April 2016, 12:32 AM   #1
martyh is offline martyh  United States
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Default Using dht self bias resistor to lift idht front end heater

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,
Marty
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Old 26th April 2016, 02:03 AM   #2
BinaryMike is offline BinaryMike  United States
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Using dht self bias resistor to lift idht front end heater
I wouldn't expect problems unless the lower SRPP cathode bypass cap is omitted.
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Old 26th April 2016, 09:40 PM   #3
hpeter is offline hpeter  Slovakia
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i have it like that, power xfmr secondary 6,3 doubler -feeding pair of dc-dc units (2,5 6,3)
the 12ax7 heater is floating 70v
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