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How does a person "pad" for 160? There are 8 switch locations aside from the plate capacitor tab on the tank switch. I can't figure out which bands they are for...was this deck used for warc bands or something? Are you saying that I can leave all circuitry the same, but drive the cathodes...

Any idea what might have been on that board that got fried? I'm planning to gut the whole chassis, categorize all my parts, and re-do from scratch in a new enclosure. I pulled the apparent "power supply" lid off, also a surplus military unit, to find it to be a massive transformer only. I welded...

The attached pics are of the tubes, amp w/tubes removed, jennings vacuum variable, burned board, and front panel of the power supply ( or transformer..) etc.. I purchased both amp and power supply for 250.00 total....didn't think it was too bad of a deal for a project...

O.K., thanks for the advice. Here are some answers to the questions as I know it now. The individual I purchased it from never used it, and had very little information other than "look at those pretty tubes". I've wanted to build one from scratch, and learn as I go. It's missing parts, but...

Could this also occur if I run a used Eimac, and purchase a new Eimac to go along with it?

I'm going to check the tube specs tonight when I get home, but as I recall, there is some differences there. I'm not sure if the Mu is the same, but I'm thinking they are some different as well. On your SB220, have you ever run mismatched tubes, ie: different manufacturers? ~D

I have picked up a surplus amp ( I think military) that had twin 4-250A tubes run in parallel. I plan to rebuild this amp using these two tubes, and repair and modify it to run in AB1, grid driven. The problem I have is that one tube is an Eimac 4-250A, the other is a Penta Laboratories 4-250A...