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
ghdprentice
6,966 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
1,186 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
6,966 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.

wolf_garcia
6,695 posts
 

Speaker coils? Hmmm...my Freya sounds great as soon as the tubes warm up and my Pass XA-25 takes maybe an hour or so but sounds so good immediately you sort of forget that. I wouldn’t think about that if Nelson hadn't mentioned it in the manual. I sometimes swap out the Pass for a Dennis Had Firebottle SEP tube amp that seems to sound great immediately, and If the speakers coils are cold you need a warmer room. Preheat ’em with a heat gun...knit them a cozy...a hug...some tea...insults...

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