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

[Paul Kraemer]

National Union was ONE that could be modified. Many others could NOT. BTDT.
Paul K0UYA
----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, March 22, 2011 2:57 PM
Subject: Re: [Boatanchors] OT: Ignorance :)) Yeah, sure


> To add further confusion, the TCS and all three Command Set manual series
> show the 1625 as a straight tetrode.  No indication on the schematics of 
> the
> beam forming plates.  The ATC, TCZ and AN/ART-13 manuals, however, show 
> the
> 1625's as beam tetrodes, with the beam forming plates connected to the
> cathode.
>
> One other thing about the 50's era mod to the tubes is that only certain
> ones could be modified.  I don't remember which manufacturers did it which
> way.  Some brought the beam forming plates lead through the glass base 
> where it
> plus the cathode lead are soldered into the cathode pin.  Others did the
> connection up inside the envelope, where you couldn't get at it.
>
> In a message dated 3/22/2011 2:29:06 PM Central Daylight Time,
> rbethman at comcast.net writes:
>> 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
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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