According to psu2 I don’t have enough b+ to raise the loadline to 140mA at which operating pint I would have 52 watts at 1.9% 2nd h. Just a little short on b+ had to pull the loadline down to 120mA so 50 Watts 3.3%.
4212E Anode is made of is Nickel not iron. So that may equally sound as good as the copper anode gm70. One slight disappointment is that the 4212D was Oxide Coated the same as my favourite 4211. But amongst all my 4212’s I don’t have a D. But positive: 1/Nickel,2/
the construction is like Peter Qwortrup’s favourite 845 construction the inverted pip.
So with the monoblock power transformers 2950CT I can’t Choke input, and dont suggest solid state FW Bridge because the rating of the core assumes its centre tapped so core rating of 250mA is when one half is on and other half is off.
Ive found what I think is low enough ripple I’d like your’ collective views. Ive zoomed in on the ripple in the pictures to follow. First cap 4uF is max allowed first cap for U19.
These are to duplicate I have all the parts required for two monoblocks. All this 250mA power supply has to do is keep one 4212 in dc volts required with a magin.
The 5687 va and EL38 driver shall form two more monoblocks with their own seperate power supplies. After Phil then that gives flexibility. The principles of Stephy at least both diode biased. Probably choke input power supply, possibly capacitorless.
