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Started by flester, March 26, 2018, 06:10:15 PM
Quote from: Jazz P Bass on March 27, 2018, 01:01:03 AMSure you can socket the ic.First off, I would prove that the ic is bad.
Quote from: flester on April 08, 2018, 07:20:18 AMQuote from: Jazz P Bass on March 27, 2018, 01:01:03 AMSure you can socket the ic.First off, I would prove that the ic is bad.Yes that is the first step. If it is to be replaced, what are pros and cons to using a socket rather than soldering chip to board?Sent from my SM-G935F using Tapatalk
Quote from: Jazz P Bass on April 08, 2018, 11:54:59 AMIt was never stated exactly what is wrong with amp."Doesn't work" does not lead to the opamp.
Quote from: g1 on April 13, 2018, 02:10:03 PMI didn't have any luck with the video, but from the sound of your description, those pots might just need to be cleaned.
Quote from: solderer25 on April 14, 2018, 02:51:59 PMYou dont need to worry about discharging caps as voltage across them not large enough to be a hazard in small SS amps. Just make sure amp is unplugged when you delve inside. To clean pots, get hold of some contact cleaner spray (Servisol or similar - not WD-40!) Fit the small tube (looks like a straw) into the nozzle and spray for a second or two inside the pots. There should be a small vent hole in the body of the pots into which you poke the tube and spray. Give the jack sockets a blast while you are at it. This is best done by inserting a jack plug to open the spring contacts before spraying. Good luck.
Quote from: wetty on April 11, 2018, 02:25:56 PMIf it failed once and it fails again following the same scheme:A lot of ancient/recent FX/boutique amp designs use an unprotected TL072 or similar as input stage.Often the poor input transistor gate is hard-tied to the phone tip without any protection. Suggestion: Insert a series resistor of 4k7 or 10k between Tip and OpAmp, connect two antiserial Zener diodes 2,7V from OpAmp input to GND.From now on spikes or DC thumps from connecting DC ring-switched active basses/guitars are swallowed by resistor and zener. The gate junction stays alive a bit longer. And once somebody starts to unsolder an OpAmp: A socket is always handy. One fine day you may want to swap a TL052 in. Or what ever crosses your mind...