26-02-2015, 04:48 PM
Looking at the circuits of a couple of Solarton valve HT PSUs (SRS151, SRS153) they both use series stabilisers which are effectively cathode followers. They both use a separate heater winding and elevate the heaters to the output voltage so that there is no stress on the HK insulation. FWIW, the 153 uses a pair of something similar to EL81 for the series pass while the 151 uses no fewer than 6 EL37 in parallel.
I've also looked at the circuit of a Tek 547 scope which uses a couple of 6080 as series pass regulators. Thinga are a bit more complex in this design but again the designers have used separate heater windings to minimise HK stress.
If I were deisgning something like this I would look at what some undoubtedly competent designers did before me and budget for a separate heater supply.
I've also looked at the circuit of a Tek 547 scope which uses a couple of 6080 as series pass regulators. Thinga are a bit more complex in this design but again the designers have used separate heater windings to minimise HK stress.
If I were deisgning something like this I would look at what some undoubtedly competent designers did before me and budget for a separate heater supply.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
