Troubleshooting: amplifier Musical Fidelity A1
 

In article , Mark Hennessy
wrote:
"Jim Lesurf" wrote in message
...


Jim's right - it seems to be a stock fault with these. But there's no
capacitors to check in this instance - my feeling is that it's a design
problem.

Ah. You mean they just allow d.c. bias to flow though the wipers?

IIRC this is 'relatively safe' with one polarity, but cruds up the wiper
and track with the other polarity. Sort of 'mini electroplating in the
home'. :-)

Please feel free to have a look at my homepage - you'll find lots of
info there, including schematics. It's currently the first result on a
Google search for "Musical Fidelity A1" ;-)

I'll have a look as well. I am after data on older MF items as well as
other UK makers. :-)


Farnell stock the Alps "Blue Velvet" pot - don't know the part number
off the top of my head, but it's easy enough to find. 50K Log is what
you need.

Cheers,

Mark -- http://www.mhennessy.f9.co.uk/

Thanks from me for letting me know the above. I should probably have known
already, but had forgotten! Do they also do the 40mm (big) detent pots? I
now only have a couple of these and my old suppler went out of business a
few years ago. They are very useful in controls as they allow controlled
re-settable, well-calibrated levels to be dialled up very easily.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

Troubleshooting: amplifier Musical Fidelity A1
 

Many thanks to all for your quick and good answers.

I already knew Mark's web site http://www.mhennessy.f9.co.uk/mf_a1/

Unfortunately I cannot replace the preamp: I need some cash so I am
thinking to sell the A1, sigh sob :-(

I am looking for the potentiometer, but here in Italy it is very hard
to find.

I write to Musical Fidelity. If they don\'t reply, I will order at
Farnell, even if shipping cost will kill me!

Best regards, Massimo

Troubleshooting: amplifier Musical Fidelity A1
 

Many thanks to all for your quick and good answers.

I already knew Mark\'s web site http://www.mhennessy.f9.co.uk/mf_a1/

Unfortunately I cannot replace the preamp: I need some cash so I am
thinking to sell the A1, sigh sob :-(

I am looking for the potentiometer, but here in Italy it is very hard
to find.

I write to Musical Fidelity. If they don\'t reply, I will order at
Farnell, even if shipping cost will kill me!

Best regards, Massimo