General > General Technical Chat
Fazio Electric
Johnny10:
That's interesting that you say this about Caig Deoxit. All the tube amplifier repair gurus recommend using D50 or Fader F-Series Lube to correct scratchy pots.
I have used it on my 1960's era Stromberg Carlson Tube amps with lasting (many years) effect.
But I am willing to rethink this if you have evidence to the contrary.
I am going to be repairing a couple of 1970's Mcintosh transistor amps that are beginning to have crackly potentiometer issues.
Noting that these are mostly unobtainable parts.
NiHaoMike:
That's the most elaborate nail painting I have seen on an electronics tech. It's already showing signs of wear which explains why it's more common with software engineers.
nctnico:
--- Quote from: Johnny10 on December 26, 2021, 10:00:57 pm ---I am going to be repairing a couple of 1970's Mcintosh transistor amps that are beginning to have crackly potentiometer issues.
Noting that these are mostly unobtainable parts.
--- End quote ---
Unobtainable in what way? If it is just the value, you can put a resistor in parallel to get to the original value give or take some non-linearity but that is likely dwarfed by the tolerances in the rest of the circuit.
floobydust:
--- Quote from: nctnico on December 26, 2021, 07:35:50 pm ---I noted the can of Deoxit contact cleaner which was used to clean destroy the potmeters on a unit :scared: A real repair would be to replace the potmeters with new high quality ones. Or just leave the potmeters as-is if they are fine. If it ain't broken don't ruin it.
--- End quote ---
DeOxit works fine on switches and potentiometers. It's kind of designed for that. Where are you getting this "destroy" bullshit from?
Worst I've seen are cleaners loaded with petroleum-based oil which is terrible on phenolic. Cleaning out the old lube etc. without removing oxide from the wiper leaves you will a scratch pot still.
Replacing the potentiometers on vintage gear is difficult (high ohmic value, taps etc.) and expensive they easily run >$15 a piece, and don't even mention putting in cheap chinese parts.
I shotgun (outright replace all) electrolytic capacitors at the 40 year old mark, good luck to all who think they are fine for another 20.
Johnny10:
Do a little research on vintage Hi-Fi amplifiers and preamps.
2-6 thousand dollars is not uncommon.
Where do you get original type parts for reasonable dollars.
Volume pots for my unit running close to 90 dollars.
Guess shouldn't have said unobtainium after a bit more searching.
The question was, is Deoxit going to be destructive in some way?
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