[Milsurplus] TCM-2

[Richard]

I always worry about running tubes in parallel, but the 803's are fine 
in the TCM.  Many years ago futzing around on 190 kc.  I briefly tried 
two parallel 211's and had a vicious (presumably) VHF parasitic.  I 
never solved it, but one 211 worked fine.  At MF you don't have to 
neutralize triodes.  I only ran it briefly as a beacon because I didn't 
want to live in the near-field of a transmitter, probably radiating one 
or two Watts.  I could light a fluorescent tube anywhere in my 
backyard.  Yes, I know it was illegal; that was 30 years ago, and I 
promise not to do it again.

Richard, AA1P


On 07/05/2017 12:21 PM, Richard wrote:
> That's pretty close.  My TBW, with guaranteed output of 100 Watts, 
> (from memory) measures 190 Watts.  Two 803's should be at least 380 
> Watts.  Noting that the TBW has no parasitic suppressors, the 803 is 
> probably more stabile and a better choice than the 813 and other 
> beam-power tubes.
>
> Richard, AA1P
>
>
> On 07/05/2017 01:04 AM, Kenneth G. Gordon wrote:
>> On 5 Jul 2017 at 3:13, howard holden wrote:
>>
>>> Looking at the tube lineup it's a GO-9 (or a TBW) on 
>>> steroids.....should be a fun rig to operate.
>> Yes. That was kinda what I figured too.
>>
>> The pair of 803s will operate within specifications at 350 watts 
>> input each. Output will be
>> slightly more than 400 watts for the pair.
>>
>> That "Navy-rated 125 watts output..." means, "Tune it up into an 
>> antenna, put a brick on the
>> key, and come back in a month or so and it will still be outputting 
>> 125 watts." ;-)
>>
>> A pair of 813s isn't all that much better at the same voltage: 2KV.
>>
>> Funny thing is, both are rated at 125 watts plate dissipation. The 
>> 813's plate dissipation rating
>> is actually closer to 250 watts, though.
>>
>> Anyway, it is fun to speculate.
>>
>> I don't understand why more hams didn't jump on the TCM. It would 
>> have been a perfect ham
>> rig for CW. It is small, it is VFO controlled, it covers all the main 
>> ham bands, its power
>> requirements are reasonable, it is very stable, keying sounds very 
>> good. Maybe there weren't
>> very many of them made. I dunno. It is a really neat rig.
>>
>> Ken W7EKB
>>
>>
>