Hi,
The PSU was designed with four separate identical xformers sporting separate heater and HT windings.
I honnestly can't remember the VA rating I used but obviously the bulk of the current goes to the heaters.
A margin of 25 to 30 % won't do any harm.
Cheers,
Hi Frank, sorry to come back to you again.
The HT winding for one circuit is quoted as 300mA in the part list on page 4 of the thread, so +30% means 400mA. Do you think this is about right. Yes I know is was a long time ago, but HT windings that can deliver 400mA at 400V are difficult to find (so far I can only find a 600V and they cost 200 euro each)
Hi,
The original xformers were sourced from RS Components. 300mA should suffice.
200 Euro each sounds excessive to me but hat preamp was not exactly cheap to build either.
Back in those days valves were still reasonably priced though.
Up to you but this isn't a cheap project, it never was.
Cheers,
The original xformers were sourced from RS Components. 300mA should suffice.
200 Euro each sounds excessive to me but hat preamp was not exactly cheap to build either.
Back in those days valves were still reasonably priced though.
Up to you but this isn't a cheap project, it never was.
Cheers,
Hi,
I hope I am not late on that thrad, tring to find the best PSU for my SRPP preamplifier (the anzai tiplogy)
At the moment I use a el86 driven by 1/2 ecc83 but I think ecl82 can do more and I need some advice.
I have several atempts for a decent ecl82 HT psu as follows:
I hope I am not late on that thrad, tring to find the best PSU for my SRPP preamplifier (the anzai tiplogy)
At the moment I use a el86 driven by 1/2 ecc83 but I think ecl82 can do more and I need some advice.
I have several atempts for a decent ecl82 HT psu as follows:
Attachments
Last edited:
Hi,
A suitable PS.
I used one for each channel.
The 4K7 trimpot allows to set the output of the regulator to output 350VDC.
The heater and biasing scheme isn't included in the drawing.
Basically I'd use 2*15VAC, each of which bridge rectified, filtered and regulated using 7812s of sufficient current rating.
Cheers,
Hi,
Thank you for taking an interest.
Even I do not even have a photo but the best way to build it is to use separate chassis/housings for PSU and preamp unit.
Grounding should be star ground at the quietest point of the PSU.
It should be dead quiet regardless of volume output. No humm, no hiss. Quiet.
Cheers,
Thank you for taking an interest.
Even I do not even have a photo but the best way to build it is to use separate chassis/housings for PSU and preamp unit.
Grounding should be star ground at the quietest point of the PSU.
It should be dead quiet regardless of volume output. No humm, no hiss. Quiet.
Cheers,