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41-608 BOL
davidff
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Posts: 83
Threads: 30
Joined: Aug 2011
City: SOUTHINGTON, CT
#1

10-15-2018, 09:04 AM
Hello experts,

 My tone arm on the BOL has dim brightness on the  bulb.  I have used other NOS bulbs and get the same result.  I believe the chassis has the adjustment screw turned up all the way also.  I have used new wires from the socket to the chassis that are slightly higher in thickness, could that be the cause or any other suggestions?  When I use a #55 bulb, which is similar but not correct, it is brighter, but not good on the sound reproduction, I like the original bulbs better.  On my 1942 -1008, no such issues, seems strange.  Any suggestions?
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Radioroslyn
Phorum Expert
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Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#2

10-15-2018, 11:22 AM
Check the voltages around the 7B5 and the condition of the 7B5. The bulb is powered by rf energy developed by the local osc (7B5). Looks like 11B should adjust the brightness.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
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