View Full Version : Amplifier Pilot Light not working...
So I was playing today with my DR Z carmen Ghia and I looked around at the amp, which seemed to have some electrial interferance (but not loud enough to be sure) and the pilto light was out...
The amp sounds fine, but the light is gone :/ What could this be.....
I am hoping its as simple as changing a bulb?
08-27-2011, 09:58 PM
Might be but the "electrical interference" you mention might be a sign of a rectifier tube going bad (when added to the pilot light not on).
Not sure if the Carmen Ghia is even tube rectified but on others whenever I've had a light go out that was the problem every time.
Of course along with changing the lamp also afterwards.
08-27-2011, 10:09 PM
I haven't looked at the schematic (and I doubt one's readily available) but the pilot light is typically wired to the 6v taps from your PT, which also provides heater voltage to preamp and power tubes. If that wasn't working only your rectifier tube (assuming it's 5v) would light up and you'd get no sound.
I think your diagnosis is correct -just a burned out bulb.
08-29-2011, 04:21 PM
Radio Shack has your bulb. I recently flipped out at a gig when I thought I had blown a fuse. While frantically trying to locate the problem (I thought I had fried a tube) I turned the amp on and noticed glowing tubes. I felt like a complete dumbass but it was the first bulb I've ever had blow in 35 years. I think the bulb was in the $1.00 range.
08-30-2011, 03:39 AM
At Radio Shack the bulb (lamp) you want is the #47.
08-30-2011, 05:20 AM
Most of these are push & turn. Just push it in & give it a turn, and it pops right out.
08-30-2011, 10:51 AM
Yes, bayonet base.
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