[Milsurplus] TCK-4

[Meir WF2U]

I like to run surplus equipment with the original power sources. All my
originally dynamotor operated gear is running as designed, with dynamotors
and the appropriate primary voltages.

Running the original MG would require a high current rectification and some
sort of filtering from the 240 VAC line due to the required primary voltage
of 230 VDC, at 30 amps starting current, and at 10 amps key-down current at
full power output Which shouldn't be a huge problem.
To run the original MG the magnetic controller unit is needed, either the
original CG-211297 (I have the feeling that it is just about unobtanium), or
a homebrew duplicate.

Otherwise it is simple to build a conventional power supply for the TCK.

The power requirements are: 1800 VDC at 400 ma (PA plates); 500 VDC at 350
ma (PA screens, and plate supply for all the other stages); 115 VDC at 100
ma (bias); 12 VDC at 2 amps (microphone supply and relays. 
The filament transformers in the TCK are powered either by 115 VAC or 165
VDC at 60 Hz (the MG has a 165 VAC output for that purpose)- the filament
transformers have taps for these options. 
The MO oven and thermostat controlled fan use 230 VDC. 

My TCK-7 is running with the 115 VAC input homebrew power supply I got it
with. The power supply is somewhat anemic, as both high voltages are under
the originally specified voltages (1500 VDC and 350 VDC), limiting the
output power to just around 300 W. I need to rebuild the power supply with
higher voltage transformers, which I already have.
The power supply doesn't have a 230 VAC output for the MO temperature
control, but the MO is stable at regular room ambient temperature without
the oven and fan running.
I didn't notice any chirp by listening to the keying, and didn't receive any
reports of chirp on the air. I didn't check the waveform with a scope.
Unfortunately my TCK came with the rotors completely shattered into small
pieces, with most fragments missing in all 4 wafers of the bandswitch
section of the PA tank circuit (the bandswitch is ganged for all stages, for
single-knob bandswithching), beyond any possibility for repair, so I just
strapped the PA tank coils for the 3.0 to 4.5 MHz band. In essence, It is a
single band transmitter until I find a solution for that switch (or, if I'm
very lucky, and find a parts unit or spares with that switch).
It is a fun transmitter to use, and tunes into a 50 ohm antenna system
easily. In fact, the manual specifies the power output into a 50 ohm system.

I'm pairing it with the RAL receiver for CW.

73, Meir WF2U
Landrum, SC

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
Kenneth G. Gordon
Sent: Thursday, February 09, 2017 5:20 PM
To: Milsurplus at mailman.qth.net >> Milsurplus
Subject: Re: [Milsurplus] TCK-4

Geeze, youse guys, you're making it difficult for me. Now I want a TCK MG
set....

Gotta be close to Moscow, Idaho and free, though...

Ken W7EKB

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