[Heathkit] HW-16 question

[Billy B. Johnson]

Hw-16s are fun little radios!  It was my first rig as a novice.  Currently have two of them.  One is operational and one is waiting on the restoration process.  Enjoy your HW-16s!

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________________________________
From: heathkit-bounces at mailman.qth.net <heathkit-bounces at mailman.qth.net> on behalf of Bill Cromwell <wrcromwell at gmail.com>
Sent: Friday, August 23, 2019 8:17:42 AM
To: heathkit at mailman.qth.net <heathkit at mailman.qth.net>
Subject: Re: [Heathkit] HW-16 question

Hi Lynn,

While waiting to hear from somebody who can answer your question about
why, I might suggest installing the replacement and trying it out. Then
reversing the leads and trying it again. See if there is a discernable
difference. The neon bulbs are not polarized in the way that diodes or
electrolytic caps are and nothing catastrophic should happen. Some neon
bulbs have the needed series resistor (current limit) built-in and the
dot may indicate which lead is connected to that resistor.

One of the key characteristics of the neon bulbs (and other gaseous
tubes) is their striking voltages and operating voltages. Maybe somebody
else can confirm what part number should replace the broken one.

I have an HW-16 that I got as a basket case and has been waiting for my
attention, I am getting more motivated to move it into my bench and
start down the same road you are on. Good luck to you with yours:)

73,

Bill  KU8H

On 8/22/19 10:49 PM, lynn simons via Heathkit wrote:
> Hey Guys,
>     I am in the process of restoring an HW-16 and found the neon bulb that is used in the sidetone circuit was broken. The schematic just lists this as a "neon bulb" as does the parts list. In the assembly instructions it mentions the bulb has a red dot on one side and it should be installed on the circuit board with the red dot on the side depicted on the silk screening of the circuit board. The sidetone circuit is a relaxation oscillator and my understanding is that I can just replace this bulb with another neon bulb like a NE-52 or such. Is this correct? Also, I didn't know that neon bulbs could be polarized such that they had to be installed in a certain orientation. Can someone elaborate on this for me?
> Thanks,
> 73, Lynn,  KJ3V
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