[Boatanchors] Suppressor grid modulation

[D C *Mac* Macdonald]

I was simply speaking of the "4-" glass bottles of Eimac and others.
 
Mac


----------------------------------------
> From: km1h at jeremy.mv.com
> To: k2gkk at hotmail.com; ianmwilson73 at gmail.com; boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Suppressor grid modulation
> Date: Wed, 27 Jan 2010 16:35:25 -0500
>
>
> ----- Original Message -----
> From: "D C *Mac* Macdonald" 
> To: ; 
> 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
>> ______________________________________________________________