Leak RC/PAU component values? - UK Vintage Radio Repair and Restoration Discussion Forum

Bill · 7th May 2021, 9:07 am

Has anyone got a list of components for this pre-amp? I have the circuit diagram but this is marked just as R1, R2,C1 etc. There looks to be a number of high value Rs , 5 & 10Megohm and a lot of similar looking mica caps. The valve is an ECC40. trying to work out which component the numbers refer to is quite difficult especially round the wafer switches.thanks

GrimJosef · 7th May 2021, 11:05 am

Stephen Spicer's book, Firsts in High Fidelity, which I regard as the authoritative source for all things Leak, has the circuit of the RC/PA/U in it with component values added. But I note that the version on Stephen's website here http://www.44bx.com/leak/Leak/Circuits/RCPAU.gif is the one without the values. This is unusual and I wonder if there might be a copyright issue.

I'd recommend buying the book (I'd recommend it anyway, even if you didn't need the component values) but unfortunately it seems it's out of print and it's a long time since I saw a second-hand one available, at least at an affordable price. I do have a copy, but given the issues I'm not inclined to post a scan on a universal-access website like this.

Perhaps the best thing to do would be to contact Stephen ? He's been a member of this forum, so a PM might reach him, but unfortunately I can't recall his username (maybe the mods could help ?).

Cheers,

GJ

7th May 2021, 9:07 am	#1
Bill Pentode Join Date: Dec 2005 Location: Denton, Manchester, UK. Posts: 188	Leak RC/PAU component values? Has anyone got a list of components for this pre-amp? I have the circuit diagram but this is marked just as R1, R2,C1 etc. There looks to be a number of high value Rs , 5 & 10Megohm and a lot of similar looking mica caps. The valve is an ECC40. trying to work out which component the numbers refer to is quite difficult especially round the wafer switches.thanks

7th May 2021, 11:05 am	#2
GrimJosef Dekatron Join Date: Sep 2007 Location: Oxfordshire, UK. Posts: 4,311	Re: Leak RC/PAU component values? Stephen Spicer's book, Firsts in High Fidelity, which I regard as the authoritative source for all things Leak, has the circuit of the RC/PA/U in it with component values added. But I note that the version on Stephen's website here http://www.44bx.com/leak/Leak/Circuits/RCPAU.gif is the one without the values. This is unusual and I wonder if there might be a copyright issue. I'd recommend buying the book (I'd recommend it anyway, even if you didn't need the component values) but unfortunately it seems it's out of print and it's a long time since I saw a second-hand one available, at least at an affordable price. I do have a copy, but given the issues I'm not inclined to post a scan on a universal-access website like this. Perhaps the best thing to do would be to contact Stephen ? He's been a member of this forum, so a PM might reach him, but unfortunately I can't recall his username (maybe the mods could help ?). Cheers, GJ __________________ http://www.ampregen.com