I've managed to get a couple sets of outputs for the Palomar 90A on E-Bay for reasonable prices, but it's only a 2 tube amp. Seeing as the TV sweep tubes aren't nearly as robust as real transmitting tubes and these old amps tend to eat output tubes like candy, other than for the fun of it I'm questioning the worth of bothering with it too much longer. It won't take very many tube replacements to get to the cost of something like a new Dave Made base amp that not overdriven can be a lifetime investment without a lot of the headaches.