2. amps-preamps
  3. 186645-86

Tube Preamps Should Have This Feature

So it's late or you just want some casual listening for a short time. "Should I fire up my tube pre for 30 minutes?". My answer is "No". Why not let me flip a switch (or push in the volume control) to put my pre into "bypass" mode? Bypass would, effectively, convert your pre into a passive device, keeping the tubes dark.

This sounds useful to me.

128x128dweller
invalid
1,189 posts
 

@ghdprentice  power tubes do age faster, but those are in the output stage of an amplifier, not in the power supply section usually, though some power tubes can be used as rectifiers and in some regulation positions.

ghdprentice
6,969 posts
 

@invalid 

That makes sense the lasting longer would not extend from power tubes to rectifier and smaller tubes.

So, what is your preamp / DAC.

invalid
1,189 posts
 

@ghdprentice my preamp is space tech Lab qa112 and my DAC is also space tech Lab DA24/196, I'm using a separate power supply with the preamp called a super rectifier STR104 with two 3b22 rectifier tubes each rectifier tube has a 6amp heater current.

ghdprentice
6,969 posts
 

Thanks. Interesting. I had not heard of them. Lots of tubed equipment. They must use the tubes conservatively to get so much mileage out of them. Always good to see different audio companies.

milpai's avatar
milpai
2,377 posts
 

Your speaker coils need the 20-30 minute warm up more than the tube amp or pre amp......According to Steve Deckert
 

Very interesting. Never heard of that before. And I am not saying this with any sarcasm.

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