Wanted: Pass B1

[montesquieu]

Yes I know I know .. I've bought and sold three or four of these over the years but I'm looking for another one.

Far beyond my meagre capabilities to build one, sadly.

Anyone got one lying around unused?

[hornucopia]

You and 'Lord Mortlock' both! You may both have owned my old 'Morfaudio' one. Good luck- from a Pass fan.

(Currently on a battery-powered Stereo Coffee LDR Pre-amp into an F3)

[montesquieu]

You and 'Lord Mortlock' both! You may both have owned my old 'Morfaudio' one. Good luck- from a Pass fan.

(Currently on a battery-powered Stereo Coffee LDR Pre-amp into an F3)

Yes I had that one.

I don't like having kit lying around unused so I sold it ... stupid of me really.

[diceman]

This one look is nice, hot rod and some Gucci components.
http://www.diyaudio.com/forums/swap-meet/310829-salad-hotrod-dcb1-gourmet-build.html

[Arkless Electronics]

I can make you one. Or an Arkless one. Or a Lindsey Hood one. Or a diamond buffer or... lots of other variations. All just buffers;)

[Barry]

I can make you one. Or an Arkless one. Or a Lindsey Hood one. Or a diamond buffer or... lots of other variations. All just buffers;)

The circuit of the Pass is very simple. I might build one myself - if I knew what the J-fets were!

http://www.dms-audio.com/node/19

[Barry]

This one look is nice, hot rod and some Gucci components.
http://www.diyaudio.com/forums/swap-meet/310829-salad-hotrod-dcb1-gourmet-build.html

£200 seems reasonable, given the build and component quality. Might be too late though as the seller is about to cannibalise it for parts. (As of 7.08.17)

[montesquieu]

Made contact on that one hope it's still available.

[Jazid]

I have one, unused, a dc coupled kit variant, can't remember much about it tbh but it is in a tidy case and properly built.

Sent from my GT-I9195 using Tapatalk

[Arkless Electronics]

The circuit of the Pass is very simple. I might build one myself - if I knew what the J-fets were!

http://www.dms-audio.com/node/19

Yeah it's just a textbook zero offset FET (assuming matched FETs) buffer and shouldn't really be called a Pass anything.... One will find it in text books from 40 years ago! It uses the unfortunately discontinued 2SK170. A new version is now available from Linear Systems as the LSK170 but at a much higher price than the original. The only issue is that if using it DC coupled then the matching of the FETs is important. FET's are notoriously variable from one to another so if going for excellent matching many FET's will need to be bought and selected into matched pairs. Not too bad if they were 15P but at more like £3 each....