[Heathkit] Filament Voltage Regulation

[Eddy Swynar]

Hi Rodger,

Thank-you so very much for that---I shall look it up here poste haste!

~73~ de Eddy VE3CUI - VE3XZ



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On 2011-09-30, at 7:47 AM, WQ9E at btsnetworks.net wrote:

> Eddy,
> 
> I believe the article you are thinking about is "Improved Frequency Stability for the Heathkit SB-300" in the November '75 issue of QST.  
> 
> Rodger WQ9E
> 
> -------- Original Message --------
>> From: Eddy Swynar <deswynar at xplornet.ca>
>> Sent: Friday, September 30, 2011 6:33 AM
>> To: heathkit <heathkit at mailman.qth.net>
>> Subject: [Heathkit] Filament Voltage Regulation
>> 
>> Hi Guys,
>> 
>> Can anyone reading this recall a brief article that described REGULATING the 6.3-VAC filament voltage to the SB-300 receiver...?
>> 
>> Apparently the author of the write-up was experiencing "thermal drift" in his 300, that was attributed to the filament voltage LOWERING in his PTO oscillator tube whenever another heavy load came on-line to the AC mains. If I recall correctly, he used a voltage doubler / zener diode combination to hold filament voltage steady at 6.2 VDC just for the oscillator tube...
>> 
>> Does anyone recall the source of this, or am I simply having "...a senior moment"...?!   : >)
>> 
>> ~73~ de Eddy VE3CUI - VE3XZ
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> 
>