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Leaving my amplifier on ok?
I did have a carver receiver go up in flames, but it only lasted a split second, and unless there was a lot of paper and kindling on top of the receiver there was no chance of a fire.  
Why is solid state more popular when tubes are better?
@emergingsoul  you do realize that a 300 watt tube amp will not have the harmonic distortion content like a set amp would have.  
SET Lovers, what's the one solid state amp you love(d)?
I don't consider Cary audio the very best example of tube equipment.  
Leaving my amplifier on ok?
@pindac    I have never heard of an insurance company not paying because of the reasons you state, do you have some examples?  
Why is solid state more popular when tubes are better?
@bolong    What if you are not overdriving the amp or preamp? Tubes still sound better for some reason.  
Krell Multiamp Chassis and Hum
@erik_squires  Exactly what I did when I first got my krell ksa 300s and had to use an AVR for a preamp, I had ground loop hum and it disappeared when I disconnect the coax from cable tv.    
This e-mail has been cryogenically treated
How would you ever verify if your speaker cables are 99.99% OFC copper?  
Tube Preamp: How many tubes does it take to .................
My next line stage is going to have 6 power tubes in the signal path.  
Tube Preamp: How many tubes does it take to .................
Just because a preamp has multiple tubes doesn't necessarily mean they all have to be matched. I know of a line stage that has 10 tubes in the signal path and only pairs need to be matched.  
Tube Preamp: How many tubes does it take to .................
Power tubes can even be used in a preamp, one manufacturer I know of uses power tubes in some of his preamps and DACs.  
Tube Preamp: How many tubes does it take to .................
It also depends on if you are using dual triodes or single triodes, and if you are using half wave rectifier tubes or full wave. If you are using half wave rectifiers you can use 4 tubes for a full wave bridge, you can't do a bridge with full wave... 
Stupid class A question
The krell ksa 250 is not class A to full power, only up to about 28 watts or so.  
DAC Under $3000
I would recommend a space tech Lab dac with a super rectifier. I have a space tech Lab dac and there is no hum with or without a preamp. If you go to Canuck audiomart you can read all the user reviews describing just what you are after.  
Tube Preamp, uses 6sn7/6sl7. With or Without Phono; With or Without Remote Volume,
Check out space tech Lab preamps, they have many to choose from with 6sn7/6sl7 tubes, and power tubes for the output stage.  
Magnapan LRS+ VS .7
@tubeguy76  Does The Music Room stock them?