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

[Bob W5UQ]

I believe you to be absolutely right Bob.  (WA5CAB)

I now remember that there were only certain manufacturers or brands, 
that could successfully be modified.  Memories  are coming back of 
hunting for them as some of mine were not the right brands.

I believe........ in my humble opinion...... that the certain brands 
that COULD be modified and used in GG, were the ones where the beam 
forming plates, if there were any, were connected to the suppressor grid 
and not the cathode.
This way, all elements between the cathode and the plate could be grounded.
OR... something like that.

Now that would explain the different data on the tubes that was 
available.  Essentially electrically they were the same.... until some 
curious ham found that they could be modified.  We hams are a funny 
bunch.  Just won't leave things alone.  Keep doing the impossible even 
in the face of someone saying, "you can't do that".

Okey dokey?

Speaking of "way back when".....I hesitate to mention that I also bought 
a 24/12 Vdc dynamotor and re-wired it(per article in CQ...or QST) to 
work on 12/6 Vdc.... I was probably 16 or 17 years old.  It was in my 55 
Red and White Ford (6Vdc system) that I put it. Worked too.  Had to lift 
each wire on the commutator and move it one brush over.  It was a 
tedious job, especially for a kid.

I remember it whining, winding up and winding down....  it could be 
heard in my signal too..... Wow...  I used a Gonset mobile converter on 
my AM radio and a home brew AM transmitter.
Back then, mobile antennas were not as sophisticated as they are now. 
And I was only a kid and what did I know?   But it worked.

Center loaded whip.... whoop...whoop.... whoop... shades of Brother Dave 
Gardner and the sheriff that had a tall whip on his car... remember 
that?  And "Miss Daisy"?   She was alright until we turned her head 
around....  hee hee.

When I moved to Tulsa (1958) and the Arkansas River flooded, late 50's 
or early 60's, we hams helped to provide communications. We were 
stationed at crucial points on the riverbanks.  Sandbagging was being 
done and we were there all night plus having to still work our jobs too.

:-) :-) :-)
Bob

and the beat goes onnnnnn!

Good will and happiness is contagious.
So don't stop spreading it.

SEE my website: W5UQ.com
aka: A25UQ, V31UQ&  VP2EEU.
QRZ.com is accurate for all calls.
I Will be adding ZF2UQ in July.



On 3/22/2011 2:57 PM, WA5CAB at cs.com wrote:
> 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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