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My Bendix TA-12 with dyno / modulator




 
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Author Topic: My Bendix TA-12 with dyno / modulator  (Read 1034 times)
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w1vtp
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« on: April 01, 2018, 12:31:38 PM »

This is my Bendix TA-12. My mentor Don, W1GAZ promoted this transmitter along with the Hammarlund SP-400, an excellent pair. My transmitter continues to be in a state of stasis because I don't know how to safely get rid of the green corrosion that is on the rotary inductors.  The MP28a dyno / modulator seems to be in new unused condition (dunno why the tape was put over the vent holes on the dyno)

I'll upload several pics in successive posts

Al


* TA 12 FRONT.gif (1331.9 KB, 2000x1325 - viewed 126 times.)

* TA12FRONT & MOD-DYNO SIDE.gif (1227.46 KB, 2000x1325 - viewed 138 times.)
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w1vtp
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« Reply #1 on: April 01, 2018, 12:34:38 PM »

Pic set 2


* MP28A SIDE A.gif (1367.12 KB, 2000x1325 - viewed 92 times.)

* TA12 DYNO.gif (1547.44 KB, 1604x2000 - viewed 111 times.)

* MP28A SIDE B.gif (2260.71 KB, 2000x1849 - viewed 103 times.)
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w1vtp
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« Reply #2 on: April 01, 2018, 03:15:31 PM »

set 3


* TA12 DYNO BOTTOM.gif (2298.31 KB, 2000x1872 - viewed 106 times.)

* CORROSIAN TOP.gif (1338.42 KB, 2000x1325 - viewed 113 times.)

* CORROSIAN DETAIL (SIDE).gif (1014.44 KB, 2000x1325 - viewed 104 times.)
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w1vtp
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« Reply #3 on: April 01, 2018, 03:19:41 PM »

Set 4


* REAR VIEW.gif (1329.94 KB, 2000x1325 - viewed 114 times.)

* TOP.gif (1551.69 KB, 2000x1516 - viewed 105 times.)

* BOTTOM.gif (1633.05 KB, 2000x1325 - viewed 103 times.)
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #4 on: April 01, 2018, 03:38:48 PM »

That's a nice set, please tell something about it. Are the tubes 807? The pics are a bit too large to download, every pic takes about 6 minutes!!
Interesting the combination of mod and pwr supply!
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Patrick J. / KD5OEI
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« Reply #5 on: April 01, 2018, 07:55:59 PM »

Very beautiful set!
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Radio Candelstein - Flagship Station of the NRK Radio Network.
AJ1G
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« Reply #6 on: April 01, 2018, 09:31:18 PM »

Re the tarnish on the roller inductors, did you try Brasso or silver polish? You are lucky to have the dyno/modulator as well as the transmitter.  Many transmitters but few dyno/mods out there...
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Chris, AJ1G
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #7 on: April 02, 2018, 06:50:14 PM »

Hi Al
I had once a roller inductor that had the same problem. It was mainly a kind of grease they used that had turned bad, that may have been a little acid or so and provoked the problem. I used a rough type of cloth with alcohol to remove the green / blue grease.
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w1vtp
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« Reply #8 on: April 02, 2018, 07:10:34 PM »

That's a nice set, please tell something about it. Are the tubes 807? The pics are a bit too large to download, every pic takes about 6 minutes!!
Interesting the combination of mod and pwr supply!

PA0NVD:

I assume you mean the file size not the picture dimensions. The transmitter has oscillator / buffers of 12SK7's  The output consists of 2 x 807s in parallel. The 807s are driven by a single 807.  In my opinion a perfect tube linup.  The modulator consists of push pull 807s driven by a 6N7 / 6F6 driver.  The whole transmitter was a well designed unit used by the Liberator bomber and other WW2 aircraft.  

PA0VD, I'll customize some highly compressed images that are without loss of detail and picture size.  I've contacted you via your QRZ email to determine your comfortable file size per email.

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Tom W2ILA
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« Reply #9 on: April 03, 2018, 08:15:32 PM »

Great looking set!  And a nice S38 also.
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