[Boatanchors] Suppressor grid modulation

[Carl]

----- Original Message ----- 
From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
To: <ianmwilson73 at gmail.com>; <boatanchors at mailman.qth.net>
Sent: Wednesday, January 27, 2010 1:40 PM
Subject: Re: [Boatanchors] Suppressor grid modulation


>
> 4-125 and 4-400 series are pentodes?  Since when?
> The "4" identifies them as tetrodes.

 The "5"
> identifies the 5-125 series as pentodes.
>
> 73 - Mac, K2GKK/5
> (Since 30 Nov 53)
> Oklahoma City, OK

AKA  4E27A, and preceded by the the 4E27, T-257, H&K-257 and a few others 
that made a clone.

Carl
KM1H





>
>
>
> _______________________________________
>> Date: Wed, 27 Jan 2010 09:42:47 -0800
>> From: ianmwilson73 at gmail.com
>> To: boatanchors at mailman.qth.net
>> Subject: Re: [Boatanchors] Suppressor grid modulation
>>
>> The 4-125A/4-400A are pentodes. I notice that the 5-125B is a pentode and
>> has g3
>> voltages specified (a sign that it's a true suppressor grid).
>>
>> 73, ian K3IMW
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