[Milsurplus] Japanese Chair

[howard holden]

The TBW and GO9 use an 803 in the PA, not an 813. And the 843 modulator 
in the TBW is in a suppressor grid circuit.

Howie WB2AWQ


On 2/14/2017 2:50 PM, Mike Morrow wrote:
>> The TDE and TBW are very similar in use of dual sections
>> for HF and MF, use of screen modulation and the use of a
>> signal 813 PA tube.
> I don't know about the TDE, but that 843 modulator in the TBW wouldn't make much of a screen grid modulator for an 813.  Westinghouse was fond of PA suppressor grid modulation instead.
>
> I doubt that weight savings, if any, is what determined that the GO-7/8/9 series would not have the TBW's modulator.  It would have likely required less than two pounds to add the TBW's 843 suppressor modulator circuit to the GO-* rectifier-modulator.  Since a GO-series unit was a long-range transmitter locally operated by a skilled operator in large patrol aircraft, I suspect the USN decided deliberately without consideration of weight issues that the GO-* transmitters needed A1 and A2 modes only.  Skilled radio operators were always Morse proficient.  A3 mode was of minimum value except for the pilots' GF-*/RU-* set.
>
> Mike / KK5F
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