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FDP Forum / Amp Mods, Repairs, and Projects / Delayed pilot light

Hal G.
Contributing Member


Hi, I'm an ampoholic. Hi Hal!
Jul 6th, 2019 01:14 PM   Edit   Profile  

What would cause a pilot light to take 20 seconds or so to reach full brightness? The amp is a Guild Thunder I with a tube rectifier and no standby switch. Once warmed up it works fine. Filter caps?


Too Near Atlanta GA

Amp Tech Emeritus
Jul 6th, 2019 02:50 PM   Edit   Profile  

I was first going to say a dirty contact on the bulb was most likely, but then took a look at a schematic for that amp and it looks like your most likely have a neon pilot lamp that is fed by high voltage through a dropping resistor. So a cap issue isn't out of the question, but it could also be a failing neon lamp (or other type as I am not sure of what lamp it uses), or a bad resistor...or depending on how the bulb is connected...it could indeed be a dirty contact on the bulb. Be careful with this one as it's not the usual 6.3 volt GE#47 type pilot lamp.


FDP Forum / Amp Mods, Repairs, and Projects / Delayed pilot light

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