[Milsurplus] FW: requesting data on TBW audio transformers

[Richard]

A bit late, but:

T205  Audio Input Transformer

Ratio 1:32  200 to 350 cycles

Pri. 1 to 2  0.5 volt  .08A.  400 turns  11 Ohms,  (carbon mic. input)

Sec. 3 to 4  16 volts  12,500 turns  7,700 Ohms,  (to 843 grid)


T204 Modulation Transformer

Pri.  1 to 2  147 volts  .02 A.  2800 turns 620 Ohms,  (Conn 843 plate)

S1   7 to 6  31 volts   600 turns 230 Ohms

S1   6 to 5  21 volts  400 turns  180 Ohms

S1   5 to 4  53 volts  1000 turns  400 Ohms

Terminals 4 to 7 feed the 803 suppressor for AM modulation

S2   3 to ground,  8 volts  7 turns 0.027 Ohms,  (voice side-tone output)

Richard, AA1P


On 05/23/2018 07:04 PM, Hubert Miller wrote:
>
> *From:* Hubert Miller
> *Sent:* Wednesday, May 23, 2018 4:02 PM
> *To:* Military Surplus Mail List <milsurplus at mailman.qth.net>
> *Subject:* requesting data on TBW audio transformers
>
> If someone has easy access to their TBW manual, and feels like doing a 
> little ( a little ) pro bono work:
>
> earlier this year I scrapped a TBW supply, keeping just a few parts.
> I kept the audio transformers. I would like to know the working 
> impedance of the two audio transformers
>
> ( not the 0.65H choke ) and/or the pinout. I kept these parts because 
> 1. audio transformers are less and
>
> less common and 2. for possible homebrew receiver project.
>
> I'm taking a guess that one xfmr is mic to grid and one is plate to 
> 803 suppressor.
>
> tnx, Hue
>
>

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