Volume on Normal Channel Control?

[dumbassbob]

I changed a plate resistor on the normal channel,it was reading 118.It was a 100K,5%,CC The other plate (R) was a 100K, 10%CC it read 107 so I left it alone..Also when I checked the input jacks to burnish the shorting switch there was a gap of .002th. so I retensioned them.The crackling noise I had went away,but now when the volume is Off I am getting a tiny bit signal bleed through. The Vibrato channel is fine...The pots are 52 years old..I didn't Deoxit them...Does any one have a answer

[Jazz P Bass]

Those old style potentiometers had a bad habit of Not going all the way to zero ohms when turned fully CCW.

Are you nitpicking or is the bleed through a problem?

Good call on the shorting jack.
Happens alot that thay go open.
It's a real treat trying to get them to fully close again.

[dumbassbob]

Those old style potentiometers had a bad habit of Not going all the way to zero ohms when turned fully CCW.

Are you nitpicking or is the bleed through a problem?

Good call on the shorting jack.
Happens alot that thay go open.
It's a real treat trying to get them to fully close again.

Nitpicking,but I just wanted to know if "I" did some thing wrong...or if that.1 or .047 cap was leaking too...

[g1]

Short the wiper lug of the pot to the ground lug. If the bleed stops then the pot is the cause.

[Leo_Gnardo]

Nitpicking,but I just wanted to know if "I" did some thing wrong...or if that.1 or .047 cap was leaking too...

What JPB said ^^^. Just for fun put your ohm meter on ground to wiper. I'll bet it bottoms out somewhere between 10 and 200 ohms.

Even if the pot was perfect, and ohms dialed right down 3, 2, 1, zero, there's another easy leakage path for signal: from one preamp triode to the other, located within the same tube. Some tubes do this worse than others, but I haven't found inter-tube leakage to be brand specific. A local studio just HAD to make this problem go away (who plays the amp with the volume control on zero, oops 1 for Fenders, anyway?) so....... I just scrambled the tube assignments a bit. Both channels first stage were done with V1's two triodes, and post volume control makeup gain with V2. No more "leakage". Just by moving 6 wires around.

IF you had failing filter caps, there's another signal leakage path, but your power supply has been tended to recently & we don't expect any problems there.