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Class D amps seem poised to take over. Then what?
yes, but is Class D stable into 2 ohms?Yes, they are stable into 1ohm, the H20 amp that Henry used to make was used with the apogee scintilla.   
Amplifier Break-in - It's Real
I would be interesting if someone bought a new pair of monoblock amps and burned in one amp and then compared the two. I bet the sound difference would be very audible between the two amps. 
Lousy IEC Connections
They all need cable risers.The power cable to my amplifier doesn't need cable risers, it goes straight from the wall to the IEC connector on my amp without even touching the floor.  
Your NOS tube favorites.
Just signal tubes or rectifier tubes also? I like my Taylor brand 866a Mercury rectifier tubes and the next best sounding rectifier is the RCA 1616 made for the US navy. 
First tube preamp recommendations (under $5k)
I’d stay away from some of the very boutique brands. If you decide to move on you may find it hard to sell.  If I were you I’d go for Audio Research. It’s well built, is desirable on the used market and sounds terrific! Even if the very boutique b... 
Class D amps seem poised to take over. Then what?
Class D amps can sound good, you just have to put a tube dac and tube preamp in front of them. 
Need a DAC Recommendation.
The tube in the Border Patrol is part of the power supply, not the audio signal path.The border patrol has a tube rectifier, so you are correct.  
First tube preamp recommendations (under $5k)
New:  Audible Illusions M3BDoes this preamp burn through tubes fast like the older model audible illusions preamp did? 
Tube buffer in tape loop@
If the buffer makes listening more enjoyable then why not. 
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.