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Discussion in 'Amp Tech Center' started by Wicked-T, Jan 2, 2018.
It's like autoincorrect or something...
I started a debate on another site about my deluxe amp, last night I replaced the tone
control/switch with a newer CTS 1 meg (closer to spec) and switch, and once done the
hum level dropped and is much quieter. The debate is pot's don't cause hum if bad, I
think because of the current going though the pot if it's shielding or whatever degrades
because of age does something.
Or....perhaps a cold solder joint? I once switched out the positions of a special pot from a Vib channel to the Normal channel due to a scratch that cleaner/lube would not correct. When I got the pots in the circuit, there was no scratchiness in that ‘offending’ pot. There was a cold solder joint causing the scratching noise.
I'm going over it bit by bit checking everything to make sure.
The new resistors came in the mail today and I put one in sure looks
better made than the old ceramic on.
A few things -
I see what looks like a green ground wire but also what looks like a "death cap". Was a 3-prong cord installed (properly) and the death cap disconnected?
Also, the blue molded caps may have "worked" in another amp, but could be noisy in this one. Why didn't you simply use fresh caps? The practice of splicing parts to old leads can also lead to problems in some case.
The circuit board looks like it's seen too much heat at times. There are melted areas - and what is the red "stuff"? Damaged boards also can cause noise issues.
Solder in the eyelets could be done better. It should completely fill the eyelets. Not a noise "solver" - just good solder technique.
I noticed someone mentioned metal preamp tubes. Those are the older versions and are often noisier than "glass bottles". I don't suggest using them. Testing them on a tube tester won;t tell you anything useful other than to hep weed out completely bad ones.
The death cap is detached on one side and a 3 prong cord was put in, the melted areas
is wax I apply to hold the caps better because the board is warped from years of heat.
The red stuff I have no idea what that is paint or other. The amp is much quieter since
I changed the tone/switch pot to a newer CTS (believe it or not 65 pot) that I rebuilt and
sounds fine. I would love to put a new board in but have to wait till I get my act together,
the soldering joints well this poor guy has had the parts changed a few time before me
so they are what they are.
Never liked the AC switch on a pot, and I hope y'all will not soon forget this!
Yes I hear you I don't like them either but! it is what it is and I found a NOS CTS
switch and it works good, another thing spraying deoxit F5 might not be a cure
all for these pots with switches it might add a slight oil that stay's on all the parts
and in time might add to noise.