[Hallicrafters] Re: [Boatanchors]Replacingrecttubeswithdiodesquestion

[jeremy-ca]

Its hard to not get mesmerized watching 872's dance to the modulation.

Carl
KM1H


----- Original Message ----- 
From: "Jim Wilhite" <w5jo at brightok.net>
To: <boatanchors at mailman.qth.net>; <hallicrafters at mailman.qth.net>
Sent: Wednesday, February 13, 2008 5:43 PM
Subject: Re: [Hallicrafters] Re: 
[Boatanchors]Replacingrecttubeswithdiodesquestion


> Even the 866 mercury vapor rectifier only required 15 seconds of heater 
> voltage before applying anode voltages.
>
> Jim/W5JO
>
>
>
>
>> Most RF amps apply all voltages at the same time no matter what type of 
>> filament.
>> The difference is that plate current cannot be drawn until the warm up 
>> delay circuit has operated.
>>
>> Manufacturers specs on directly heated filaments as used in ham amps 
>> state that only a "few second" delay is required before drawing full 
>> plate current.
>>
>> Military and civilian mobile and aircraft equipment ran off dynamotors 
>> and SS power supplies. Instant B+.
>>
>> Its about time to put myths to rest once and for all; its really getting 
>> old.
>
> _______________________________________________
>