Joe Rudi Call sign NK7U on Wikipedia, Ham Nation Interviews and Ham Shack are below…
Bands: 80 – 10 Meters (full bandswitching)
Output Power: 70-100W SSB, CW; 17-25W-AM
Power Supply: Internal
Final Tube(s): 2ea. 6146
SSB Method: Phasing
New Price/Year: $450-$495/1959-1963
Size: 9.5″h x 19.25″w x 16.0″d
Approx. Weight: 80 lbs
Source of Info Ham Radio Museum
More info plus an inside view and schematic… Radio Museum . org
Bakelite was patented on December 7, 1909. The creation of a synthetic plastic was revolutionary for its electrical non-conductivity and heat-resistant properties in electrical insulators, radio and telephone casings and such diverse products as kitchenware, jewelry, pipe stems, children’s toys, and firearms.
SR-400 Production years were 1965-69
400 W PEP, 360 W CW (power input), 20-tube 80-10 Meter CW/SSB Transceiver “Cyclone”. Dual conversion receiver. Include VOX, PTT, AALC, Product detector, 1650 KHz crystal lattic filter, CW side-tone, crystal calibrator, combined R.F output & S-meter, noise blanker, RIT with a 3 KHz offset, driver tube is a 7558. External power supply.