![]() Your Twit words again, " np I'll remove." You removed your stupid and unhelpful comment because I called you out about being a dumbass. "already know the answers." So, what were you trying to teach? Nothing. You shouldn't ask questions you already know the answers to. If the hiss doesn't really increase with volume, then it's usually later in the signal chain.ĭid you clean the tube sockets and check the rest of the tubes? If you have a known good 12AX7, swap it out for each existing 12AX7 and see if it has an impact. A hiss and crackle at the first tube should be so loud and overbearing because it'll be amplified by the rest of the gain stages. That doesn't mean that it isn't the socket or solder joints, just that your tapping doesn't prove it.ĭoes the hiss and crackle increase increase as you turn up the volume? That would be a sign that it is earlier in the signal chain. You are tapping around the most sensitive part of the circuit in your video. Just making a noise is inconclusive and necessarily not a sign of 's not unusual for a device (tube, cap, resistor, even a solder joint) in the audio change will often make noise when you tap it. The only positive result that the tube is monophonic is if it goes into full runaway oscillation (feedback!) when you tap it. ![]() People rarely don't understand how this test is supposed to work. I tapped the dubes with a chapstick and found that that tube was microphonic. So, I'm thinking it's the solder joint, but maybe the socket itself? Just reflow the solder? I have nailed it down to those connections. That's when I discovered those three solder joints. and still microphonic.įinally I took the back off the amp and started probing with a chopstick. So, for good measure, I changed that socket out with a brand new 12AX7 Tube. The previous tube was fine in it's newly swapped position. That socket, with another tube, was still microphonic. Symptoms: amp starts hissing and crackling on both channels, most noticable after extended play. Amp Techs or those good with that stuff, please give a watch and help me answer the question, bad solder joint or tube socket? Maybe the Resistor coming from the reverb? It's definitely the only amp in the place making a noise when poking for sensitivity with a chopstick.
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