[Hallicrafters] Re: [Boatanchors] simple transmitter using the1625 tube

[Carl]

----- Original Message ----- 
From: "Roger (K8RI)" <hallicraftersgroup at rogerhalstead.com>
Cc: "Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Monday, November 17, 2008 2:58 AM
Subject: Re: [Hallicrafters] Re: [Boatanchors] simple transmitter using 
the1625 tube


> Posted only to the Hallicrafters group.
>
> Carl wrote:
>>
>> ----- Original Message ----- From: "Al Klase" <al at ar88.net>
>> To: "n0alo" <n0alo at kans.com>
>> Cc: "boatanchor" <boatanchors at mailman.qth.net>; "Homebuilt" 
>> <homebuilttuberadios at yahoogroups.com>; "Hallicrafters" 
>> <hallicrafters at mailman.qth.net>; "Regenrec" <regenrx at yahoogroups.com>
>> Sent: Sunday, November 16, 2008 10:09 PM
>> Subject: Re: [Boatanchors] simple transmitter using the 1625 tube
>>
>>
>>> Keep in mine this is fundamentally an 807 with a 12-volt heater and 
>>> the suppressor grid brought out separately rather than being tied to 
>>> the cathode.
>>>
>>> Al
>>
>> The suppressor is tied to the cathode inside the glass on most 1625's 
>> and inside the base on a few. Those latter ones were modified for GG 
>> operation in the late 50's.
> Back in the 60's they were real popular for a couple hundred watts 
> out...maybe 500 PEP for some really pushing them, but most I saw had 
> the connection in the base with only a few in the tube. Of course it 
> probably depends on what batch they came out of or who made them. This 
> was all in one area so it's indeed possible the ones I saw all came 
> out of one or two batches.


It was manufacturer specific Roger; out of all the vendors I believe it 
was only 2-3 that were modifiable for GG. I still have a few in the tube 
stash with the slot I cut so I could seperate the leads. A 10A driving 
one driving 4 worked well 80-20M for me for a short period when I was 
between AM and SSB and had both available. Then came the HT-37, 2B, 2x 
4-400's and a 100V, 75A4, and NCL-2000 in 1964. I always preferred 
phasing rigs for the audio quality. Finishing up a GSB-100 restoration 
now but I do get nice reports with the HT-32B/SX-115 and that same 
NCL-2000.

Modified 1625's still show up at hamfests with the seller usually not 
having a clue. It depends upon if the seller or others standing around 
have gray hair when I try to explain the purpose of the "butchery". No 
gray hair gets a glazed look for a response; I guess those tubes didnt 
get used on CB or 2M FM (;

Carl
KM1H