Amp making popping sounds and noise?
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Re: Amp making popping sounds and noise?
I ordered Nichicon VY... Are those okay?
- guitardude57
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Re: Amp making popping sounds and noise?
Good eye Jana!
I'm getting out the door, and didn't look real hard at the pix... went off of descriptions of the problem...
Cya all later...
I'm getting out the door, and didn't look real hard at the pix... went off of descriptions of the problem...
Cya all later...
Mike
I am never surprised and always amazed
I am never surprised and always amazed
Re: Amp making popping sounds and noise?
Others may feel differently, but I've used Nichicon's and think very highly of them.67Mopar wrote:I ordered Nichicon VY... Are those okay?
Re: Amp making popping sounds and noise?
The wire is not touching the center post. Solder is good.Jana wrote:I'm looking at the second photo. The tube socket in the middle sort of to the left (a 9 pin socket). There is a wire going across the socket to bridge two pins. Is that wire touching the center shield pin thing? If so, and if it's not soldered to that pin, I would highly suspect that as a source of noise and pops.
Re: Amp making popping sounds and noise?
Pictures?
Isn't 67 Mopar someone we know?
What amp is this?
Isn't 67 Mopar someone we know?
What amp is this?
Tom
Don't let that smoke out!
Don't let that smoke out!
Re: Amp making popping sounds and noise?
Okay... I've replaced the preamp filter caps and touched-up the solder joints, but the noise still exists. I took a reading at the heaters, and my Fluke meter is reading 3.2VAC! The schematics read 6.3VAC...
- guitardude57
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Re: Amp making popping sounds and noise?
where are you reading from? Sounds like one leg measured to ground?
Mike
I am never surprised and always amazed
I am never surprised and always amazed
Re: Amp making popping sounds and noise?
I touched one leg (-) to chassis, and one (+) leg to the heater terminal(s).
- guitardude57
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Re: Amp making popping sounds and noise?
You will get about 3.2 or so, between ground and pins 4/5, and also pin 9 and ground... on a 12ax7 type. Gives you 6.3 together... give or take.
Mike
I am never surprised and always amazed
I am never surprised and always amazed
- guitardude57
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Re: Amp making popping sounds and noise?
Any way of recording the noise? May help.
Mike
I am never surprised and always amazed
I am never surprised and always amazed
Re: Amp making popping sounds and noise?
I thought it was suppose to be 12.6 volts combined?
- guitardude57
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Re: Amp making popping sounds and noise?
In series... yes. 12 volts AC or DC
Parallel 6.3 VDC
Parallel 6.3 VDC
Mike
I am never surprised and always amazed
I am never surprised and always amazed
- guitardude57
- Posts: 355
- Joined: Fri May 15, 2009 6:19 pm
- Location: Austin, TX
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Re: Amp making popping sounds and noise?
What amp circuit is this?
Mike
I am never surprised and always amazed
I am never surprised and always amazed
Re: Amp making popping sounds and noise?
Got it! Reading 6.3 between pins 4/5 and 9.
Re: Amp making popping sounds and noise?
Cornford RK100guitardude57 wrote:What amp circuit is this?
It's a sort-of a white noise with random popping. Like a cold-joint, or maybe a failed capacitor maybe? There's a JFET in the circuit, and I'm suspecting it may be the culprit. I replaced all of the sockets with NOS McMurdo's, and I know those are good. If I bypass the effects loop, the noise is not audible. Rather, if I plug into the effects return, the noise is very faint - nearly inaudible. If V1 is 1st and 2nd stage gain, then V2 is 3rd stage gain and cathode follower. V3 is effects and 4th stage gain. V4 is PI. If I remove V2, the noise stops - but so does the entire signal...
Last edited by 67Mopar on Wed Feb 26, 2014 11:14 pm, edited 1 time in total.