Can you identify this part?

[emcourtney]

I have a Philips PM3266 with a fairly obvious fault in it's focus circuit; there is a burnt spot on the board where component V2078 ought to be. (see the attached PDF file) The part call-out tells me this was a V103R2 made by SL and the schematic diagram draws a very nice schematic representation of the part too.

The problem is I don't recognize the schematic symbol and I haven't had any luck referencing the nearly 30 year old part number either. Can anyone identify this mystery component? Better yet, can anyone suggest a suitable replacement?

Thanks for your time,
Evan

 

[hotwaterwizard]

Looks simular to a Neon Lamp

 

[Neal]

I think it is a NE-2 neon lamp

 

[KMoffett]

It's a "cold cathode voltage regulator tube".

Check pages 171 &172:

https://books.google.com/books?id=X...bX2&sig=nQ4vypw8FFw_5IsiPZr7Q9GR5IM#PPA172,M1

It's a vacuum tube shunt regulator used like a zener diode for high voltages.

I can't for the life of me figure out why I remember this stuff...but can't remember where I put my glasses 10 minutes ago.

Ken

 

[hotwaterwizard]

T2 Voltage Regulator 103 volts
See page 56 of this PDF

**broken link removed**

 

[hotwaterwizard]

Here is the page.

 

[hotwaterwizard]

https://mysite.du.edu/~etuttle/electron/elect10.htm

**broken link removed**

**broken link removed**

 

[emcourtney]

Thanks

Wow, I'm impressed with the knowledge floating around here. It seems the closest I can get, that are still available, is a 0C3/VR105

Thank you everyone for the help.
Evan

 

[KMoffett]

Is there any more of the schematic that would give you a hint as to the voltage drop across the tube, and what type of base the tube has? Still Available:

0A2 150v 7-pin miniature base
0B2 105v 7-pin miniature base
0C3 105v octal base
0A3 75v octal base
0D3 150v octal base

Ken

 

[emcourtney]

There is only what I've posted. There is no socket on the board, however, so the component must have been surface mounted. I don't have a digital camera on-hand so I can't really provide more.

Sorry,
Evan

 

[on1aag]

Hi Evan,

Is there enough room on the board for a "large" neon tube ?
Dimensions of the glass (of the ZZ1050) are 29 x 6 mm.
There are several possible candidates but there is only one in the
1972 Philips pocketbook that fits this description:the ZZ1000.
But there are also several lookalikes:

https://www.qsl.net/dl7avf/roehren/stabis.html

on1aag.