[Heathkit] Hw-16 neon bulb

[Tom Chesek]

That specific bulb is Heath part number 412-34.  The 1984 Heath master parts
list shows that part as a neon lamp at 62.0 volts, .40 ma, #3AGB. That
master list also shows part number 412-11 which is an NE-2 as 59.0 volts,
.30 ma.  Having said that I suspect that anything close works fine. Rev
Don's modification seems more appealing unless you want an "original".

Tom K3TVC




----- Original Message -----
From: "Donald Sanders" <w4bws at comcast.net>
To: <heathkit at mailman.qth.net>; "TJRachwal" <tjrachwal at comcast.net>
Sent: Monday, February 19, 2007 10:37 AM
Subject: Re: [Heathkit] Hw-16 neon bulb


> I didn't see a reply to your question. It is a NE-2 bulb and they are
> available from several parts dealers. I replaced the bulb in mine after
the
> wire broke. The NE-2 is part of the side tone system. There is a mod to
> bypass that and copy your signal in the receiver.
>
> Here is a simple and effective mod for the Heathkit HW-16 that fixes the
> funky sidetone and improves spotting when crystal controlled...
> Remove the neon bulb, capacitor and resistor associated with the
relaxation
> oscillator and set aside...
> Replace the 10K resistor at the collector of Q1 with a 220 ohm, ½ watt
> resistor...
> Replace the .1uf capacitor at the base of Q1 with a .33 or .47uf
equivalent
> to reduce key clicks (optional)...
>
>  The relaxation oscillator is eliminated and the receiver is lightly
unmuted
> in transmit...This allows your actual signal to be monitored in the
receiver
> with pleasant sidetone and easy spotting...
> The mod works great and is totally reversible...I run my HW-16 at the QRP
> level...You may have to adjust the value of the muting resistor for QRO...
> 73's...Jim WB2LHP (wb2lhp at arrl.net)
>
> I hope this helps.
> Healthfully yours,
>                           Rev. Don W4BWS
> ----- Original Message -----
> From: "TJRachwal" <tjrachwal at comcast.net>
> To: <heathkit at mailman.qth.net>
> Sent: Sunday, February 18, 2007 5:06 PM
> Subject: [Heathkit] Hw-16 neon bulb
>
>
> > Hi all,
> > I'm fixing up an old HW-16 and I see the lead is broken right off on
> > the neon bulb that is on the top side of the chases.  Anyone got one
> > of those around I can buy/trade?  Any data on what it is, maybe
> > "Radio Scrap" carries them? Thanks for all the fine help in the past
> > 73...Ted
>
>
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