Nelson Pass F3 Clone

[Dave Hewitt]

DIY Nelson Pass F3 Clone.
15W single ended Class A

Includes B1 buffer stage on input.
Dual Torroid PSU. Aerovox caps. Italian case with solid aluminium Front. Chord cable for all power supply wiring and Silver signal wiring.

Typical Class A sound, smooth like a tube amp but faster and more control.

£650

http://www.dms-audio.com/temp/f3-front.jpg
http://www.dms-audio.com/temp/f3-inside.jpg
http://www.dms-audio.com/temp/f3-back.jpg

[bonneville]

Hi Dave
What's next a F1?

Vinnie
ps Looks even better in the flesh.(the amp that is):)

[Dave Hewitt]

No, next thing is a F off

[bonneville]

And you the son of a Vicar!:lol:

[aquapiranha]

Having heard and seen this amp, I would have to say if I had the cash I would have it myself. Buy with confidence!

[tannoydmt]

I have a Nelson Pass original version of the First Watt F3 and was wondering if I could use your clone one in a biamp configuration, therefore for this to work without the need for an additional volume control it would need to be of the same sensitivity as mine, can you confirm this or has the addition of the nelson pass buffer affected this, also the pass buffer which you have incorporated doesn't have a volume control as shown on the first watt web site have you replaced this with a resistor network, finally can I assume everything works ok with no unusual hum,noises etc.

thanks

[Dave Hewitt]

Hi
As far as I know the b1 has no gain,its just an impedance matcher as the f3 has a low input impedance,I fitted this to alleviate any future matching probs with valve preamps etc.The boards I used for the f3 amp are from the pass group buy so I can only presume the sensitivity is the same as the bought version.There are no hums or noises using the amp through a pair of Impulse horn speakers.Only selling to fund another valve amp purchase if poss.You are wellcome to a demo if you are nearby.
Regards Dave.

[hornucopia]

Dave; is your F3 still available? Contact me on roycerolls@madasafish.com

Chris Skelton in Bristol

(Once lived in Howe Bridge, aged 2-7!!)

[hornucopia]

F3 now has a new home.......sounding lovely.