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

[Roger (K8RI)]

Carl wrote:
>
> ----- 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 (;
That was IIRC just about the time CB was getting under way and I don't 
think "home brewing" was very common <:-))

As to 2-meters, that was the time of the "Lunch Box".  They worked great 
mobile as long as you didn't get too close to the other car. 

73

Roger (K8RI)

>
> Carl
> KM1H
> ______________________________________________________________
>