Ha just read this -I probably bought it !
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Concordant Excelsior - who knows about history of this pre?
- Thread starter _webwasher
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- concordant excelsior
Yes it was a bargain back then . I haven’t a clue how much I paid but I would guess around £400-I already had one -I wanted one for a 2nd system I built with a maplin 100w valve amp which had nearly every part upgraded. Was yours with the bigger power supply .You got a bargain then, with hind sight i shouldn't have sold it
I'd be very interested in seeing a pic of the Mosfet implementation.
Is the regulated voltage set with a pair of resistors as a voltage divider to earth (output to centre pin) ?
I think the PSU on my Exquisite is putting out 270V, using 2 valves as regulation in a cascode. l'm now wondering if replacing these with the above Mosfet would lower the noise floor.
Was the 220uF cap on the amp board left in place after the Mosfet? I would have imagined that it would make the PSU worse when used with the reg (??)
Is the regulated voltage set with a pair of resistors as a voltage divider to earth (output to centre pin) ?
I think the PSU on my Exquisite is putting out 270V, using 2 valves as regulation in a cascode. l'm now wondering if replacing these with the above Mosfet would lower the noise floor.
Was the 220uF cap on the amp board left in place after the Mosfet? I would have imagined that it would make the PSU worse when used with the reg (??)
Yes. I bought it. I've entirely re-wired the thing.
Slightly differnt PSU on the Excelsior. The 3rd 220uF cap in the Excelsior is on the amp board and there's a shared heater power supply for the phonostage/ linestage (seperate in the Exquisite).
Exquisite has an additional 2nd triode regulating the B+
Thinking further about the PSU:
The Croft Super Micro was a contempory and it's PSU is not a million miles away at all
http://www.cma4ch.org/chemo/image/hifi/croft-supermicro-orig.png
220uF LCR caps in place of the 225 items noted above and 2 off 6CG7 in place of a single ECL85
Would be an easy swap to try the Croft ECL85 regulator, anyone care to comment on it's merits/ limitations? Obvious other option is the Mosfet
The Croft Super Micro was a contempory and it's PSU is not a million miles away at all
http://www.cma4ch.org/chemo/image/hifi/croft-supermicro-orig.png
220uF LCR caps in place of the 225 items noted above and 2 off 6CG7 in place of a single ECL85
Would be an easy swap to try the Croft ECL85 regulator, anyone care to comment on it's merits/ limitations? Obvious other option is the Mosfet
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Those are the 2 off LM7812 regs for the heaters (one for the phonostage and one for the linestage)Thought it had pictures of the mosfets, sorry if it doesnt
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