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Can the Same Brand Power Tubes Have a Different Sound When Bought From Different Vendors?
No USA and UK production tubes for decades! Same for Western EuropeThere are new high quality tubes being made in Europe from a manufacturer called ELROG. 
SET vs OTL
Could a DC offset protection circuit be used to make a OTL SET? 
First tube preamp recommendations (under $5k)
I've heard bad circuit designs with great parts sound bad, I've heard great circuit designs sound great with cheap parts. I agree that a great circuit design with great parts will sound even better, but this forum isn't to sell your services. 
Do I NEVER shut it off…?
regulated power supply, an amp can be turned off. I think you mean a soft start circuit, not a regulated power supply two very different circuits that do two very different things. 
First tube preamp recommendations (under $5k)
invalid I talked to the space tech labs guy and the 1 thing I didn't like he wasn't willing to show me the internals (he claims since he doesn't want people to copy him). Its something I don't like about mcintosh either.Most audiophiles don't even... 
What ever happened to Mark Levenson?
was thinking more Heinrich Hertz... He claims Heinrich Hertz is a distance relative. I think on his mother's side.  
First tube preamp recommendations (under $5k)
None of the Tech is cheap either.. BUT Art can be expensive, AY?It's not cheap, but it's way cheaper than the big name brands top of the line components. 
First tube preamp recommendations (under $5k)
A winning circuit design will sound better with cheap parts than a average circuit design with top notch parts. 
First tube preamp recommendations (under $5k)
Since you mention Don, his preamp would be a contender at far below 5K.It is definitely worth the money, but I don't believe it would compete with the higher end model space tech labs stuff. 
First tube preamp recommendations (under $5k)
Don SachsDon Sachs used to own one of space tech labs preamps, I believe it was the last preamp he sold after he started making his own, he only had one of the middle of the road space tech preamps. 
First tube preamp recommendations (under $5k)
BIG valve preamps are gonna be 'ALL THAT" soon enough..The big valves are only part of it, he uses ac heaters, which sounds a little warmer, but not too warm, and true point to point wiring. Some manufacturers use hand wiring, but not true point t... 
First tube preamp recommendations (under $5k)
"Space-Tech Laboratory - High-End Audio" http://www.thebestamp.com/Tube_Pre-Amps/Reference_Series/Reference-3.phpThis preamp can run it 150 tubes, you can also buy a separate power supply  to power it, just plugs right into the rectifier socket on... 
Do I NEVER shut it off…?
The only piece of audio equipment that ever came close to starting a fire was a carver receiver I had in the late 1980's, it shot a big flame out the top cover, so I suppose if I would have put a magazine on top of it there might have been a fire. 
Looking for an amp that punches way about its weight and I can grow with
second, they all add coloration to the sound so you are not getting true high fidelity because even the best do not have a flat response over the entire audio spectrum, especially when compared to modern day solid state amplifiers.  Generally ther... 
Looking for an amp that punches way about its weight and I can grow with
"Space-Tech Laboratory - High-End Audio" http://www.thebestamp.com/Hybrid_Power_Amps/SA-700.php"Space-Tech Laboratory Ltd.'s Feedback Summary - Canuck Audio Mart" https://www.canuckaudiomart.com/userfeedback.php?user_id=24170