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Ok I will do this in parts, one, because I don't want to cover each part in a full essay type approach, and put people to sleep, and also allow people to ask questions or add input. I have been following this thread for some time, and I certainly don't want to offend anyone. I think it's great...

They DO work, with a slight reduction in power output to keep acceptable IMD levels. The idle current is a little different, and so is the input and output impedance which seems to be more critical on these new devices in the higher end of their frequency range, such as where most people here...

This thread is kind of old, but full of a lot of things that a lot of users of these amplifiers see (especially on the newer models, using DEI transistors). I also notice a lot of misinformation, like "harmonics riding on the bias supply" which without offending anyone, is completely inaccurate...

Unless you have a tech with a scope, power supplies to power it, and a spectrum analyzer, and KNOWS HOW TO USE IT, then leave it alone. Guys changing all the fixed capacitors to trimmers in attempt to get more power out of it will ruin the amplifier. Not a lot of amp builders understand the...

When we used to deal with them, the ones coming out of Southern California, we used to use whatever was available at the time for cheap, and then make minor changes around the circuit. In the 90's, from 92-06, the most popular were the 30 volt filament tubes. We used tons of 30MB6 tubes, 30LF6...

It's actually very easy. In most (CB) style amplifiers, as long as you have enough tuning range on the plate and load variable capacitors, and some sort of input tuning adjustment you can make, the tubes will work. Most "Sweep" tubes can be substituted out for another. Most of them are very...