[Heath] Light bulbs for HW/SB transceivers

[Patrick Tocornal]

Thanks, very good response.

Pat
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: <Heath at puck.nether.net>
Sent: Monday, January 14, 2013 12:32 PM
Subject: Re: [Heath] Light bulbs for HW/SB transceivers


On 13 Jan 2013 at 18:41, Glen Zook wrote:

> They are not 12.6-volt bulbs. The pilot lamps are wired either in
> series with each other or are wired in the series-parallel arrangement
> with all of the tube heaters ("filaments"). The bulbs themselves are
> just plain old #47 and are available all over the place. Radio Shack
> has them (although slightly higher priced than the normal electronic
> parts outlets).

Another point should be made here: there is a Heathkit service bulletin 
which
directly addresses the pilot lamp issue for the HW-101 or SB-100/101/102.

Some kits were supplied with #44 pilot lamps, instead of #47 bulbs: the #44
lamps draw 250 mA each, and thus unbalance the series-parallel filament
string.

The #47 bulbs draw 150 mA each, which is correct.

Always use #47 pilot lamps, and make sure your rig does not have #44
lamps in it instead.

Ken W7EKB

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