[Hallicrafters] Re: [Boatanchors] simple transmitter using the 1625 tube

[Roger (K8RI)]

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.

IIRC the single tube transmitters tended to chirp a lot without a buffer 
stage.

73

Roger(K8RI)
>
> You may be thinking of the837.
>
> Carl
> KM1H
>
>
>>
>> n0alo wrote:
>>> Know this is a bit off topic but does anyone know of plans/build it 
>>> articles using
>>> the 1625 tube for a simple one tube crystal controlled low power cw
>>> transmitter?
>>> Many thanks
>>> Lynn
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> _______________________________________________
>>>   
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>>
>>> No virus found in this incoming message.
>>> Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus 
>>> Database: 270.9.4/1793 - Release Date: 11/16/2008 7:58 PM
>>>
>>>
>>
>> -- 
>> Al Klase - N3FRQ
>> Jersey City, NJ
>> http://www.skywaves.ar88.net/
>>
>> _______________________________________________
>>
>
> ______________________________________________________________
>