I have a Randall rh300 valve-dynamic amp head. It's a single tube in the pre-amp and the rest is solid-sate. I love tube amps, but needless to say in this case, am set back by the overwhelming prices. so this valve-dynamic thing has been working out pretty good for me.
I recently been thinking how I can upgrade my rig. So my question is how should I go about upgrading this amp head? Is it possible to rig it up to have more tubes, or change up the circuitry, etc? Basically if anyone is familiar with this valve-dynamic technology can I improve this amp head in any reasonable way?