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Beam Of Light flutter
alangard
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#1

12-13-2024, 10:16 PM
I've completed restoration of a 1941 BOL changer.  It plays fine at lower volumes.  However, if I turn up the volume past a certain point, there's a low frequency flutter through the speaker and I see the light in the tonearm fluttering in brightness in sync with the sound flutter.

Any suggestions?
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alangard
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City: Bartlett State, Province, Country: Illinois
#2

12-13-2024, 10:48 PM
duplicate reply
(This post was last modified: 12-13-2024, 10:49 PM by alangard.)
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alangard
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City: Bartlett State, Province, Country: Illinois
#3

12-13-2024, 10:49 PM
It also flutters with the tonearm unplugged and only on the phono setting - radio settings are fine.  So, I suspect the phono preamp section is going into oscillation for some reason.  Worked fine for several days, and now won't stop the fluttering.
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MrFixr55
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#4

12-14-2024, 12:52 AM
Check the circuit that drives the exciter lamp. The clue is that you see it flutter.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis

Best Regards, 

MrFixr55
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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration