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Stylized 200 watt phone transmitter from 1940




 
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Author Topic: Stylized 200 watt phone transmitter from 1940  (Read 1990 times)
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WQ9E
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« on: October 31, 2012, 08:28:28 PM »

From Radio News April 1940.

* Stylized 200 watt transmitter.pdf (1737.5 KB - downloaded 320 times.)
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Rodger WQ9E
N0WEK
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« Reply #1 on: October 31, 2012, 11:51:53 PM »

Cool transmitter!

Those transmitters sure loved their transformer iron.

Where would you find TZ-40s, all the other tubes are common. I like the parallel push pull modulator!

You could cut the transformer count in half with solid state rectifiers.
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kb3ouk
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« Reply #2 on: November 01, 2012, 07:32:11 AM »

811's will work in place of the TZ-40's.
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KM1H
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« Reply #3 on: November 01, 2012, 03:09:36 PM »

Thats with the original 811's. 811A's would also work but would be seriously loafing at 200W.

Make a few changes and use 572B's for a bit more punch, use 811A's for mods.
I guess that mag didnt get on the 813 wagon yet.

Carl
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N0WEK
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« Reply #4 on: November 01, 2012, 04:30:55 PM »

Turns out that there are currently 4 TZ-40 tubes available (cheap) in two different auctions.
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KM1H
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« Reply #5 on: November 01, 2012, 04:50:35 PM »

The Z means zero bias up to 1000V but the 7.5V filament is a PITA. They also take more drive than the 811.

Might make good replacements for 807/6146 mods in some rigs if there is room for a fil xfmr and enough drive can be cobbled up.
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