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Which lamp to use for stereo ibdicator?

jimbofish

jimbofish

for TRULY GREAT MUSIC
I have a Panasonic RE-7750 4 ch stereo receiver with a burnt out stereo indicator lamp. It's a wheat bulb and the markings on it are XAM371. I connected a DMM to the leads and get readings up to 16v.

It was my garage system, but I haven't used it for years. I'd like to give it to my friend for his newly finished garage but want to have everything working first. :yes:

This is an odd little thing, more of a budget 4ch receiver, so it's highly unlikely that there's a schematic out there somewhere. :no:

Any advise on how to determine which lamp to use?:scratch2:
 
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That sounds like a high voltage for a bulb of that type, but who knows? Look for one rated 16-20 volts. Maybe dgwojo can help you out with finding one. Sure it's not a diode? (LED). This might be worth a try? There are grain of rice bulbs on that page too, at the bottom.
 
No, it's definitely a bulb. Those might be the right ones, but I have no idea which voltage or amps. I never thought to look for bulbs at a hobby shop before. Thanks for the tip.
 
That's a normal voltage for a stereo lamp in a (many) Pioneer.

Of course, I'd replace it with an LED. Very simple (usually) to do. Sometimes, though, the drivers are always on to a small degree and the LED will light a little even when it is "off".
DH

jimbofish said:
I have a Panasonic RE-7750 4 ch stereo receiver with a burnt out stereo indicator lamp. It's a wheat bulb and the markings on it are XAM371. I connected a DMM to the leads and get readings up to 16v.

It was my garage system, but I haven't used it for years. I'd like to give it to my friend for his newly finished garage but want to have everything working first. :yes:

This is an odd little thing, more of a budget 4ch receiver, so it's highly unlikely that there's a schematic out there somewhere. :no:

Any advise on how to determine which lamp to use?:scratch2:
Click to expand...
 
Makes sense. The train lamps didn't state the amperage.

Would the 16v I measured be high because I was measuring an open circuit, and that the actual bulb voltage should be lower?
 
whsh93a said:
That's a normal voltage for a stereo lamp in a (many) Pioneer.

Of course, I'd replace it with an LED. Very simple (usually) to do. Sometimes, though, the drivers are always on to a small degree and the LED will light a little even when it is "off".
DH
Click to expand...

Would you happen to know what voltage/amp lamp Pioneers use?
 
Well, I picked up a 12v .25ma lamp today and soldered it in. If I use just a wire antenna that only picks up a few stations, it seems to work ok. However, if I hook up the coax from the roof antenna, the light stays on almost all the time except for a few spots where there are no stations at all. Not very useful this way.:no:

So, do I need a lamp with a higher voltage rating? If so, what?:scratch2:
 
I think that's got nothing to do with the lamp's voltage rating, the lamp merely is an indicator... Perhaps the tuner isn't discriminating much, perhaps an FM alignment is in order (something I am not qualified to do myself or offer detailed advice on).

However, there's possibly a simple trim pot tweak that can adjust the point at which the light comes on. On my Technics SA-404, which of course is also a Panasonic product, the Stereo light wouldn't come on at all (the opposite problem of yours). The trim pot for the FM MPX Pilot Adjustment needed tweaking a little (its VR301 on the SA404 but who knows what it'll be on yours). Look for a trim pot, labelled VR-something, with the initials VCO beside it. Note it's present position, then tweak it slightly counterclockwise.
 
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