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View Full Version : FS: Nelson Pass Buffer/Passive Preamp


floppybootstomp
31-01-2018, 13:55
Buffer/Switcher for sale.

I bought the PCB for this project several years ago and completed building it about a year ago.

Used it for around six months with a SE Tube amp with pleasing results but then bought a Croft preamp so have no further need of it.

Six inputs, two outputs, one line out and for tape rec out fitted with a 1K metal film resistor on each channel.

Passive switching via a switch bought from Hi Fi Collective, case from Modu. Those two items alone cost in excess of £80.00

Project article (https://www.passdiy.com/project/preamplifiers/b1-buffer-preamp)

The Switch (https://www.hificollective.co.uk/switches/seiden-2-pole-6-way-selector-switch-no32006-32neg.html)

Supplied with IEC mains lead fitted with UK mains plug. 240V operation.

£120 plus postage. Postage is £6 in mainland UK or postage free if collected from Greenwich, SE London UK. For other parts of the planet please PM for postage quote.

http://www.zen17796.zen.co.uk/public/buffer800/0001.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0002.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0003.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0004.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0005.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0006.jpg

http://www.zen17796.zen.co.uk/public/buffer800/0007.jpg
floppybootstomp
08-02-2018, 01:09
I've had several enquiries and lots of questions about this item but it's not sold yet.

To explain, this is basically a switcher built with quality components with an active circuit board that is a buffer whose main function is impedance matching. Or, in common parlance, a 6-way passive preamp.

If that's not clear then PLEASE read the article I've linked to in the first post here. Thank you.
hornucopia
08-02-2018, 10:57
Great things. Added benefit is that it removes the impedance mis-match worry with amps-as mentioned. Clear sound guaranteed. Pass stuff is the best.
speedracer
08-02-2018, 11:26
I have a friend who is interested in this, does it have enough welly to use a turntable as a source or is it for digital only?
robpark9
08-02-2018, 13:58
Would this be ok with valve mono power amps?
RothwellAudio
08-02-2018, 14:10
...does it have enough welly to use a turntable as a source or is it for digital only?
Will work with a turntable plus outboard phonostage.
flapland
08-02-2018, 19:54
Could I take this please. Should be able to collect or if you work up town meet.
floppybootstomp
09-02-2018, 12:02
Now SOLD subject to collection and payment.
speedracer
09-02-2018, 13:00
To who?

You haven't replied to my pm's about this.
rigger67
09-02-2018, 14:55
Does anybody else find that wonky "Power" label as annoying as I do ?? :doh:
floppybootstomp
11-02-2018, 19:15
To who?

You haven't replied to my pm's about this.

My apologies, no, I didn't reply to you, I thought I'd replied to everybody's PM about this item.

It was sold to the first person to offer full price for it and was collected today.

I am very strict with online sales about the order offers are received and will always honour 'first dibs'.

Again, my apologies for overlooking to reply to your PM.
floppybootstomp
11-02-2018, 19:27
Does anybody else find that wonky "Power" label as annoying as I do ?? :doh:

Yay! So glad I left it as it was now :eyebrows:

Here's some more things to get annoyed about Niggle Niggle (http://www.telegraph.co.uk/news/picturegalleries/howaboutthat/6131208/The-100-most-annoying-things-poll.html)
speedracer
12-02-2018, 12:35
My apologies, no, I didn't reply to you, I thought I'd replied to everybody's PM about this item.

It was sold to the first person to offer full price for it and was collected today.

I am very strict with online sales about the order offers are received and will always honour 'first dibs'.

Again, my apologies for overlooking to reply to your PM.

Ok Tony, thanks for giving me feedback, appreciated.