[Heath] Light bulbs for HW/SB transceivers

[Kenneth G. Gordon]

On 14 Jan 2013 at 17:53, G3OOU at aol.com wrote:

> Hi All
> 
> The SB-101 schematic shows three #44 bulbs, two from the 6.3v line to 
> the 12.6v line and one from the 6.3v line to chassis. Heathkit P/N is 
> 412-14.

Hi, Bob:

According to Heathkit Service Bulletins I have here, that is incorrect. 

Here is the service bulletin as applied to the HW-101. There is a similar one 
for the SB-101 which I will post here asap:

-----------------------------------------------------------------------------------------------
                          February 3, 1978
HW-101 SSB Transceiver				Bulletin HW-101-20

                LOW POWER OUTPUT, S-METER DRIFT, ETC.

The #44 lamps presently used in the unit unbalance the series-parallel 
filament line because of their 250mA current requirements. 

In each unit service, change the pilot lamps to type #47 [PN 412-11].

This change will be incorporated in future runs.
----------------------------------------------------------------------------------------------

I'll post the Service Bulletin which is directed to the SB-101 shortly.

vy 73,

Ken W7EKB
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