[Heathkit] SB-630 information 2nd request - problem discovered!

[Ken Kaplan]

Jack,

fwiw - the same part number is used in the HW-16 (which I don't have). 
The HW-16 parts list says the same thing - neon lamp. Page 42 of the 
SB-630 manual describes the function of the neon lamp. When it fires 
(i.e. the voltage reaches a point where it will conduct), it sends a 
positive pulse through C22 to the grid of V1. It shouldn't be too 
difficult to make something else work. You may have to play games with 
R24/25/26 and C23/24 to get a charge adequate to fire the lamp. 
Resistors R33 thru 37 also are part of this circuit.

There is a rather complete list of neon lamp specs on the 
nostalgickitscentral.com web page. If you get stuck, I can check the 
firing voltage on my SB-630 for you.

73 Ken kb7rgg

jack m wrote:
> Hi Tom and the rest of the group,
> 
> I did get a copy of the SB-630 Monitor parts page from a list member.
>
> The number for the SB-630 neon light is 412-34.  Description is simply, "Neon lamp".  Perhaps someone has access to the Heath Master Parts List which would spec this component and cross-ref it to a familiar GE GLow Lamp or other type.  
>
> I could not find the part referenced on the "regular" parts links commonly available to us.
>
> The SB-620 parts list at least stated the lamp used in that kit was the NE-83, in addition to the "Neon Lamp" description.
>
> Thanks to all who have helped so far.  I may attempt to expose a piece of the broken lead if all else fails - (never filed glass before).
>
> Jack  W3RU