[Hallicrafters] Re:[Boatanchors]Replacingrecttubeswithdiodesquestion

[Barrie Smith]

Carl:

Try 6 X 673s!

73, Barrie, W7ALW

----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: "Jim Wilhite" <w5jo at brightok.net>; <boatanchors at mailman.qth.net>; 
<hallicrafters at mailman.qth.net>
Sent: Wednesday, February 13, 2008 4:47 PM
Subject: Re: [Hallicrafters] 
Re:[Boatanchors]Replacingrecttubeswithdiodesquestion


> 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.
>>
>> _______________________________________________
>>
>
> _______________________________________________
>
>