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 Post subject: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Sun 10, 2019 10:49 pm 
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Joined: Dec Sun 16, 2007 4:59 am
Posts: 606
Location: Minnetonka, MN 55305
I just found a Panasonic 740, found an open resistor so it is playing fine HOWEVER the neon pilot bulb is dead. power to the socket so the bulb needs a replacement. Any ideas on where to obtain one?

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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 2:40 am 
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Joined: Jul Fri 10, 2009 10:13 pm
Posts: 1129
Location: Weymouth,Massachusetts
OK I'll bite. Which neon bulb does it use?
Henry


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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 3:27 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 4897
Location: Norfolk, VA
With a Panasonic (Matsushita/National) part number, you can likely find more info either at Union Electronics/UED.net or Encompass (formerly TriTronics).

Got a manual? I may, on microfiche.

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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 5:27 am 
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Joined: Dec Sun 16, 2007 4:59 am
Posts: 606
Location: Minnetonka, MN 55305
The bulb has a standard bayonet base and looks like a #47. There are no markings on the metal base and the parts list in the Sams document fails to mention a type or part #. The bulb is used as the pilot indicator in the upper right corner of the front.

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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 6:38 am 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 550
Location: Stone Mountain, GA
Sounds like a NE-51 bulb.
Newer part number is B1A.

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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 8:45 am 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 273
Sounds like Scott is correct, schematic shows a neon bulb with a 100K resistor in series across 120 vac.

DM


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 Post subject: Re: 1962 Panasonic 740 neon bulb source
PostPosted: Nov Mon 11, 2019 5:39 pm 
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Joined: Dec Sun 16, 2007 4:59 am
Posts: 606
Location: Minnetonka, MN 55305
The resistor checks OK. I'll look for a bulb, B1-A. This is the last step to completion of the Panasonic. It is a large plastic hand wired radio with a 6" speaker and tone control. Never seen one. Performance is nice. Thanks everyone!

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