[Heathkit] SB-630 information 2nd request - problem discovered!
Paul Kraemer
elespe at lisco.com
Tue Dec 7 15:54:26 EST 2010
Jack
I have the schematic on the 630 but no listing on the lamp
My guess it is same lamp as used in the SB-620 sweep circuit
It is a lamp with special characteristics that make it suitable for use as a
voltage regulator and in relaxation oscillators
I have a few spares from repairing 620's
About the only reasonable way to get one is buy 10
I don't remember the number off hand but if you need more help email me and
I'll look it up.
PS a neon will work on ac or dc. On dc only one electrode will be lit and
that is an indicator of polarity
Paul K0UYA
----- Original Message -----
From: "jack m" <oldvette at hotmail.com>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, December 07, 2010 12:50 PM
Subject: [Heathkit] SB-630 information 2nd request - problem discovered!
>
> I received from page 30 on and a schematic from list members - these had
> had the ops description, but unfortunately, no parts list. Now I need the
> parts list.
>
>>From the info and schematic I got, I discovered that a neon light lead (in
>>the relay circuit) was broken off at the base. No chance for micro
>>surgery on this. I replaced the light with a junk box spare, but still no
>>work. I then discovered on the schematic that there is a "color dot"
>>notation for the bulb, which the broken one had, but none of my ten spare
>>NE-2's has a color dot.
>
> So I figure this is NOT an NE-2 in the SB-630. With the NE-2, the
> ID/buzzer just goes on and stays there, but can be released with a plastic
> tool prying up on the relay. Without the NE-2, the reset button will
> pulse the relay on/off.
>
> Upon magnified inspection, I see a "GE-A6" cast into the broken bulb's
> base, whereas I see a "GE" and "2" on my ten neon spares. Both look the
> same in appearance. That's why I need the parts list. I think I remember
> that an NE-2 will illuminate one way and not the other when DC is applied,
> but these are usually used in AC service. When connected, the NE-2 has
> one quick "wink" on power-up, but that's it. The one in the circuit is
> obviously for a DC only circuit. Can anyone shed light on this part
> and/or circuit application?
>
> Just a copy of the parts list would be very helpful, as well as any
> insight to the neon bulb used in the relay circuit. Any pages from 29 on
> back would also be appreciated. Many thanks to those who have helped so
> far.
>
> Jack W3RU
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