03-03-2014, 03:25 PM
Is it possible to sub an LED for the original Stereo Beacon bulb? From what little info I've been able to find on this subject, it appears that it is possible. Your thoughts?
I have read just enough about the Fisher MPX circuit (you know they say a little knowledge is a dangerous thing
) to know that there is a positive voltage at the MPX decoder on mono signals that drops to near zero on a stereo signal. One leg of the bulb is connected to this point. The other leg of the bulb connects to a constant positive voltage that is around 30 volts (23 volts in the 440-T) on a mono signal but drops to around 15 on a stereo signal.
Morzh - Acked, but is it really worth the time and effort, since there are so many electrolytics in a typical stereo receiver? It seems to me that if I was going to go to the trouble of removing electrolytics for testing and possible reforming, that I might as well save a little extra time and just replace them. Replacing just the audio and power supply electrolytics made a big difference in this 440-T's performance, so replacing the rest should make it that much more reliable, perform better, etc., yes?
I have read just enough about the Fisher MPX circuit (you know they say a little knowledge is a dangerous thing
) to know that there is a positive voltage at the MPX decoder on mono signals that drops to near zero on a stereo signal. One leg of the bulb is connected to this point. The other leg of the bulb connects to a constant positive voltage that is around 30 volts (23 volts in the 440-T) on a mono signal but drops to around 15 on a stereo signal.Morzh - Acked, but is it really worth the time and effort, since there are so many electrolytics in a typical stereo receiver? It seems to me that if I was going to go to the trouble of removing electrolytics for testing and possible reforming, that I might as well save a little extra time and just replace them. Replacing just the audio and power supply electrolytics made a big difference in this 440-T's performance, so replacing the rest should make it that much more reliable, perform better, etc., yes?
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Ron Ramirez
Ferdinand IN
