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I have no idea of hat flux was used on that trasmitter, but I completlty dismanted and resooldered ever fitting because it had had many leaks over the years. The ports were most;yy for lrge pipes, and 1.25? inches deep. many had wetted less than 1/8' inch. which har cracked from the water pressure and vibration over the years. The final tubes require a minimum flow of 20 GPM, or sensors would shut down the 7 KV HV supply.

I believe the TTU-25 series was still in production until the mid sixties. This was a very low serial number and passed the final test on the day I was born, in 1952.

There was a TTU-1 version which was 1 KW, and used as the exciter for the larger design. Ours had had that section? catch fire, and was repaired with the three cabinet version, from the original production.

RCA used Citric acid to flush the cooling system, once a year. It was added to the cooling system, then run the transmitter without plate voltage for an hour to dissolve anything? in the system that had built up. Then it was flushed twice, with distlled water that was at operating temperature, then filled with more distilled water? and tested for conductivity. & KV would cause the water to breake down into oxygen and hydrogen, and cause major damage.

You might luck out and find the installation manual for that series online. If so, it was very detailed? about every item, since RCA treated BBroadcast equip,ent as industrial grade, built for a long serice life.