philips: Neon bulb specs from Phlips 203U

I'm hoping someone has the specs for the neon bulb that was in this set.  The original socket in mine is missing.  Did the original bulb have threads, bayonet, or did it solder in?  The schematic calls for a 7121D on the 203U and a Z10 on the 208U.

 

Best regards and thank you,

Donald 

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Hello Donald.

The glow lamp is soldered.

Another thing I noticed about this Philetta 203U - Philips Belgium, the pictures ID= 2738001, 2738002, 2738006 show the model Philetta 203U [no ventilation openings] - Philips Eindhoven.
See the nameplate

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Thank you for the kind reply.  Mine is marked "Holland" and does not have the

vents.  I think only the 208U had them.  Perhaps they had a problem with

heat on the 203's.  I finished the restoration and the radio plays well and is very selective on BC

band.  Now I have to find a socket for the neon bulb.

 

Donald

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Dear Donald,

All 203U versions are equipped with a neon bulb, as power indicator. They don't have the function as a scale illumination. The same holds for all versions of the 204U.

Only the first 5 versions of the 208U (version /10, /46, /47, /48 and /49) were equipped with neon bulbs. All later versions, including the popular 208U /05, were equipped with scale illumination. This is externally visible, as the hole for the neon bulb indication light at the front of the housing, right above the station scale, is absent with the later 208U versions.

The scale illumination for the late 208U versions was provided by Philips dial lamp 7121 (6 V), only version 208U /08 used a 8095 (19 V).

The neon bulb is a Z10 (part code A1 358 18)  and is nowadays a very rare object. I had a few in stock, but in the meantime I made all bulbs available to collectors. The best way to get hold of a neon bulb Z10 is by acquiring a chassis of a 203U, 204U or early 208U.

The early versions of the 203U and 204U had no ventilation openings. Due to heat problems, ventilation openings were made. Initially the openings were simple holes, in a later stage a series of slots were made.

Kind regards,

Gidi Verheijen

 

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