[Boatanchors] OT: Ignorance :)) Yeah, sure

[Carl]

RCA calls it a beam tube in 1944 but continues to show it as a grid and 
refers to it as Grid 3.
http://scottbecker.net/tube/sheets/049/1/1625.pdf.

In 1943 TungSol shows beam plates.
http://scottbecker.net/tube/sheets/127/1/1625.pdf

Personally I dont give a damn and still call it a suppressor grid as was the 
often substituted 837 in that same amp circuit. P&H offered their LA-400 amp 
with your choice. If it functions as a grid.....then its not a plate.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Boatanchors-qth List" <boatanchors at mailman.qth.net>
Sent: Tuesday, March 22, 2011 3:28 PM
Subject: Re: [Boatanchors] OT: Ignorance :)) Yeah, sure


> Somebody is going to have to referee this.
>
> The 1948 Radio Amateur's Handbook - Twenty-Fifth Edition, pg. 605 gives
> the specs.  It references base diagram 5AZ also.  It INDEED shows the
> suppressor grid tied internally to the cathode.
>
> It would appear that the ARRL has published conflicting information.
>
> My RCA tube manual from 1957 agrees with the above, and so does my '64
> GE Electronics, "Essential Characteristics".
>
> I'm confused!
>
> Bob - N0DGN
>
>
>
>
> On 3/22/2011 2:55 PM, mac wrote:
>> The 1625 GG linear mod was to ground the beam forming plates, not the
>> "suppressor" grid..  The 1625 does not have a suppressor grid although
>> the universally referenced base diagram (5AZ)  appears to show one.
>> (Ditto the base diagrams for the 6L6, 6V6, 813 and others.)  The only
>> reference I have that shows these base diagrams correctly is my 1949
>> Radio Handbook (11th edition).
>>
>> Dennis D. W7QHO
>> Glendale, CA
>
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