Today I got to try out the cheap SB-230 amp I scored at Dayton. I brought it up slowly on the variac, and the HV looked fine. Since I am running it on 110V, it was a little low, but as expected. No problem there. The Time delay circuit seems to work, but not much happened after that. The relay works, and with my scope, I can see that the turned circuits tune correctly, but no output, or Plate or grid current. NOTTA! So don't know if the TUBE is blown, or what. Just no response when keyed. All circuits have been carefully examined and no problems seen. I am trying to analyze the tube circuit to see where and what happens. With my scope, I DID see drive signal on the cathode coming from the resistor dropping bank. So RF is making it to the tube. Haven't tried taking out the tube and doing anything. Not sure how I can check to see if there is oxidation in the tube socket pins without taking it all apart. What is most distressing is the grid connection, which is 2 feedthrus into the final compartment and then a brass strap around the tube grid ring. That looks hard to take apart without damaging things. But with no plate or grid current, there might be some connection issue rather than a bad tube. I have no way of knowing if the heater is even heating without putting an AC Ameter in series with the filament line. This might be tough to fix, and 8873s are rare as Hen's teeth!