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Hey Michael, what do you recommend for cleaning...

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Posted on January 3, 2017 at 09:43:05
gkargreen
Audiophile

Posts: 1407
Location: DC
Joined: February 5, 2005
out or restoring movement to the tuner shafts on a Scott 340A? Those concentric shafts get "sticky" over time with whatever lubricant they use in them, do you have a suggestion for "unsticky" them or making them move more easily? Thanks, Randy

 

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RE: Hey Michael, what do you recommend for cleaning..., posted on January 3, 2017 at 11:56:48
Michael Samra
Dealer

Posts: 35478
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
I clean the bearings of the tuning capacitor with Dexoit D5 or equivalent.You only put a drop or two on each bearing on the tuning capacitor and then work it back and forth..Then you put a drop of turbine oil on each bearing and then work it back and forth down the tuning scale the same way.
You also can do this same procedure for the tuning shaft that holds your knob that's froze up.Here is the oil I use and it's superb.I use it on my furnace motor as well.

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

 

RE: Hey Michael, what do you recommend for cleaning..., posted on January 3, 2017 at 13:31:38
gkargreen
Audiophile

Posts: 1407
Location: DC
Joined: February 5, 2005
Thanks, Michael, I will be sure to give this a try! I don't think it is the bearings that are the problem but the grease packed between the inner shaft and the outer shaft (cylindrical tube) that the inner shaft moves inside of. Not frozen, but getting harder to turn!

 

RE: Hey Michael, what do you recommend for cleaning..., posted on January 3, 2017 at 16:31:29
Michael Samra
Dealer

Posts: 35478
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
I meant to tell you,wait about an hour between cleaning and lubing on the tuning capacitor bearings.

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

 

Where do you get those brass tube pin cleaner brushes, posted on January 4, 2017 at 06:37:45
airtime
Audiophile

Posts: 8514
Location: Arizona
Joined: February 4, 2003
I don't know which ones or where to get the tiny little ones for the small tubes.

 

Thanks, Michael, can I ask another question about , posted on January 4, 2017 at 14:12:02
gkargreen
Audiophile

Posts: 1407
Location: DC
Joined: February 5, 2005
this Scott 340A? I rebuilt the power supply, replaced caps, etc., but I have a 120 buzz on the output that measures around 1.2 v on the plates & screen, not much voltage on the speaker outputs, but definitely audible. In the past I have found this buzz, which does not vary with volume, to be related to the heater voltage, most of these amps do not have a center-tap ground and the 340A it is the same, from what I am tracing it is grounded to the chassis at one end of the heater string, in this case, the end of the string is at the last light bulb, which is grounded to the chassis. I was wondering about constructing a center tap by placing two 220 ohm resistors on each side of the filament and then grounding the other two ends to the chassis, similar to what is done on standalone amps where the heater string is sent out to power an outside preamp, such as Eico's, Heathkits, etc. Do you have any suggestions? Thanks, Randy

 

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