[Boatanchors] Which one tube TX ?

[Doug Forbes]

Thanks to the list for all the help

Doug WA6VYN

Doug Forbes
Professor / Department Chair
Computer Science / Electronics / Music Technology
College of the Canyons

http://sites.google.com/site/dougforbes1/home


On 4/28/2012 9:59 AM, Geoff wrote:
> If you want to revert to the 50's an AC/DC TX using a 117M7/L7GT, 
> 117N7GT, 117P7GT can give you 2 to 5W out with the rectifier built in 
> and work with any crystal. Just use common sense safety.
>
> A 12BY7, 6GK6 and a few other 9 pin types will do more but requiires 
> 200V+ to attain it.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Bill Cromwell" <wrcromwell at gmail.com>
> To: "Doug Forbes" <dougforbes at dslextreme.com>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Saturday, April 28, 2012 11:04 AM
> Subject: Re: [Boatanchors] Which one tube TX ?
>
>
>> On Sat, 2012-04-28 at 07:44 -0700, Doug Forbes wrote:
>>> I am building a one-tube transmitter and am concerned over the crystal
>>> current. How much current will an HC-49 handle safely ? How about an
>>> FT-243 ? Is there a one-tuber that is nicer to the crystals than 
>>> another ?
>>>
>>> I really appreciate any help you can give. I know you folks have
>>> probably answered these questions many times.
>>>
>>> Doug WA6VYN
>>> ______________________________________________________________
>>
>> Hi Doug,
>>
>> Do you want to build a one stage power oscillator or do you want to
>> build a one tube transmitter. If you use a tube that has two (or more)
>> devices in one envelope you can realize a MOPA with one tube. Something
>> like the 6U8A comes immediately to mind. Some of the Compctrons have
>> three or more devices inside one glass tube (and more power than a 6U8).
>>
>> For the power oscillator there are some tuning tricks in the plate
>> circuit that help the crystal survive. If I remember correctly some of
>> the hams tune the plate circuit to the low frequency side of resonance
>> to take it easy on the xtal. It may be the other way round. Some others
>> put a light bulb in series with the xtal. Some do both. I didn't make
>> good notes because my personal minimal transmitter starts at MOPA and
>> goes up from there.
>>
>> 73,
>>
>> Bill  KU8H
>>
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>
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