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mx110 new volume control

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Posted on January 3, 2017 at 14:07:04
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003
It's a long i don't use my beloved mac mx 110 due to a very noisy

volume control .

Anyone could help me to find an original one or alternative ?

Thank you .

I've tried so hard to find a nos one but i did. not succeed

 

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RE: mx110 new volume control , posted on January 3, 2017 at 16:29:42
Michael Samra
Dealer

Posts: 35577
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
Many times you have a leaky bumblebee capacitor or capacitors that feed the volume control and what happens is,it will make it cut out like you have a bad pot because you are putting DC voltage on the volume control which is a no no.
Take your DC volt meter and check and see if you have DC voltage on each pin to ground of the volume pot.If you have .5vdc or more on any of the pins,you need to change out those caps first.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: mx110 new volume control , posted on January 4, 2017 at 02:36:58
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003


Thank you Michael for the tip.

I will try and make you know.

 

RE: mx110 new volume control , posted on January 4, 2017 at 04:09:47
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Ok ,i have set on 2000mv red on adc black on the gorund:no dc current

flow on the 6 pins of volume control.

I noticed that when i turn the pot clockwise one of the pins is

moving slightly front to back ;if i put a very little bit of

deoxit (Philips dry contact cleaner )is gettin better ,but is

not solving the issue .

Do ineed a freh pot?

The unit was checked several times during years by very

knowedgeable technician.

 

RE: mx110 new volume control , posted on January 4, 2017 at 10:12:42
Michael Samra
Dealer

Posts: 35577
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
I don't want DC current,I want to know if there is DC voltage of more than 1vdc or more.If there isn't,it's time for a new pot.As far as one of the pins moving when you turn it,that is no big deal.Which model MX-110 do you have? Is it a MX-110z?

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: mx110 new volume control , posted on January 4, 2017 at 12:46:58
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Sorry i meant voltage ;no dc voltage ;yes it is a z mx110(compactron

6d10)serial n 539z4

 

RE: mx110 new volume control , posted on January 5, 2017 at 07:28:18
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Dear Michael

maybe ,do you have a spare one ?

Feel free to contact me Pm

 

RE: mx110 new volume control , posted on January 5, 2017 at 07:47:02
Steve O
Audiophile

Posts: 6643
Location: SE MI
Joined: September 6, 2001
Did you try Audio Classics in New York state USA? I purchased a NOS volume control for my "X" series MX110 from them about 4 years ago. They had to check their stock to verify they actually had one. It was expensive but fits and operates perfectly.

 

RE: mx110 new volume control , posted on January 5, 2017 at 10:52:30
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Thx Steve

i've send them a mail ...waiting for a reply.

Great place here ...a lot of gentlemen

 

RE: mx110 new volume control , posted on January 5, 2017 at 16:10:56
spindoctor
Audiophile

Posts: 1099
Location: Virginia
Joined: December 31, 2002
Contributor
  Since:
September 19, 2015
I second Audioclassics. They've done wonders with my MX 110. I had the Modafferi modifications done by them while it was repaired. Talk with Ryan Kilpatrick.

Sim

 

RE: mx110 new volume control , posted on January 5, 2017 at 16:51:08
DaveV
Audiophile

Posts: 294
Location: SC
Joined: December 26, 2009
When I got my C-22 back in 1990 the volume control was noisy/scratchy and I was able to solve the problem by spraying contact and control cleaner into each section while working the control back and forth.

I guess you can I flooded the pot because I put enough in so that it came back out while I was rotating the pot. The runoff was absorbed by a crumpled paper towel under the pot.

I tilted the chassis so that the openings of each section were as upright as I could get them so as to let the cleaner stay in a bit then I tilted the chassis so that the openings were downward to let the pot drain as much as it could.

That very effective cleaner was Blue Wash or Blue Shower but I don't think it's been available since that aerosol can propellant ban.
I now use DeOxit5 after a wash of alcohol or a contact cleaner I get at Home Depot.

 

RE: mx110 new volume control , posted on January 6, 2017 at 03:17:27
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Unfortunately they e -mailed me that don't have the potentiometer

in stock.

Thanks for answer

 

RE: mx110 new volume control , posted on January 6, 2017 at 03:28:55
2con
Audiophile

Posts: 62
Location: lombardia
Joined: February 12, 2003

Yes Dave ,i have done it the same procedure several times during

the years ;it works for a little then the orrible scratch is

coming back ;i think that the carbon tracks of the potentiometer

are on the last leg ;i own mx 110 since 1990 and i used it for

long years ;it was my first tube and vintage unit and would like

to have it in pristine condition again .

It was checked on ordinary basis by a knowledgeable technician

and he said that i need a new potentiometer (original, if

i dont't want follow the Alps 50 k double pot route )

Thanks anyway for your tip (maybe i will try with the product

you suggest me)

 

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