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Pops Backflow

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About Pops Backflow

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  1. Fortunately for me I have a veriac and a high-quality powered de-soldering gun. I attempt to rebuild or repair dozens of components every year for the last 50 years and there is no way I'm going to use a hand pump or solder wick on something that has a 25% chance of bursting into flames when I'm done. I can use that time I've saved with the vacuum pump to fix something else that may burst into flames when I'm done with it. Before I left for work this morning I went ahead and switched the op amps and I found 2 questionable solder joints on a couple of resistors that I re-float as w
  2. Thank you for the great suggestion, swapping the op amps is a great idea. I'm just a hobbyist but I've been soldering every sense I built my 1st crystal radio with my dad 4th of July 1970. That's not to say that I do not have a bad solder connection but swapping the op amps as opposed to re-flowing seems like a better path for success. On another note for those who are interested I've got over 4000 hours on Bob's 275 with a stock tubes. Every thousand hours I will swap in my reference tubes that are new and just broken in, I could not hear the difference when both sets of tubes were new f
  3. I did try disabling everything to no avail. The op amps and brown dog adapter look good but I'll reflow the solder just to make sure. It's just so strange that the only way to get the channel back is to turn the preamp off and back on again. When I get to the bottom of it I will let you guys know in case somebody else has an issue like this. I will say that I checked almost every single parts values before installing them. I know that may seem crazy and a waste of time but I don't have the equipment or experience to track down a questionable part after the fact.
  4. I'm hoping someone can help me out here. 1 of the 4 C1 preamplifier's that I did the billD upgrade on is starting to show an issue after about 6 months of use. My left channel will lose about 50% of its amplification after the unit has been on and running for a little bit. The pots are clean and silent, to get the left channel back to 100% I have to restart the preamplifier with the power switch. I thoroughly checked all the solder and everything looks completely fine, any ideas would be greatly appreciated.
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