.. Your confusing the KRA-124/248/448 Series, KRA1121 which preceeded it,
with the KRA-116 (ToiletBowl) and it's later cousins, the KRA-240 and
360. The Toilet Bowls all had HV Breakdown problems on the Main Display
boards, up untill the 240MKII's, when they redesigned the Trace paths
for the HV Section. The KRA-121's had 2K25 Klystrons, and were First
Generation, Marine Radars. KRA-124 Series were the first of the Second
Generation Radars, that had Gunn Diode LO's and the MKII versions had
Ring Circulators, instead of TR Cells. Third Generation Radars had
MMIC's, and Ring Circulators like the 1600's, 2400's and 701/1001 Series.
I put one of the first KRA-116's on the little Harbor Tug Western Towboat
had called the Wasp. It was a preproduction unit and ran for 6 hours
before the Inverter Board in the Powersupply went up in smoke. Old
Man Shrewsbury, wasn't so sure that these Jap Radars were any good after
that fiasco, cause it took a week to get a new board out of the factory
in Japan. Now if you look on any of the Western Towboat Tugs you will
see 100% Furuno Radars everywhere in their Fleet.

Bruce in alaska

Yup, I did confuse the KRA1121 with the KRA-124 to 448 series, The only
1121 I worked on, then was the one on the Yacht/halibut boat. The KRA-124 to
448's were about 50% of the installations on our ferry contract. The rest
were Decca group 9's. The toilet bowl, was surely an interesting concept,
and when they became FR240's and up, with a vented toilet bowl they were a
real class act. (for the time...... of course)
Thanks for helping clear some fog!
Old Chief Lynn