2. amps-preamps
  3. 195077-47456

I changed a Tube and…

I liked it!
 Have a Rogue Audio Cronos mag lll bought it years ago as original Cronos Mag  sent it in last year for the upgrade to lll .  Never changed any of the original tubes .

The amp was lightly used due to my changing amps like regularly. Decided to stick with Cronos and and have really enjoyed it . 
Playing vinyl for the majority of time and seem satisfied with Triode mode .  Amp runs perfectly no noise at all but thought about all the threads regarding tube rolling  especially the center 12au7 . 
pulled out the stock JJ and found a Genalex  Gold Lion ECC82/B749 (12au7)  bought them 7-8 years ago .  
Put the GL into center position and was thinking “am I going to really hear a difference “???   Figured I listen to a few LPs and maybe I’d notice something different good or bad Maybe ? after all it’s just one tiny tube !

Well I was blown away !, 30 seconds in listening to “two of a mind “ Desmond /Muliligan  things just got a whole lot more musical 🎶. Hard to describe everything seemed improved , midrange was wow ! Soundstage was better , etc .

Went to another familiar favorite Grant Green “ Idle Moments “   Oh yes the magic is here too 

Is this even possible or am I under a placebo delusion  lol 

Now I’m really wondering what about the other 2  12au7’s  and even the 2 -12ax7’s

what else am I missing ? 

 

 

 

mfm22
mfm22 OP
38 posts
 

I have the original kt120 tubes -   I do have a bunch of tube 12au7 & ax7's 

bought a few years back thinking i'd change / roll - never got to it .

found the Gold Lions in a Box with some Mullard EL34'S [ For Dynaco ST70] 

and figured i'd try one - being new I wouldn't have doubts on the wear .

 

not sure about those prices from Brent - ? 

dekay's avatar
dekay
5,805 posts
 

I picked the reasonably priced tubes that give you a good taste of RCA and Amperex.

I’ve used all of them in my preamp with good results.

I generally run late 60’s Mullard Blackburn 12au7’s (short plate/round getter), but he didn’t have any, plus they would be $150+ a pair if he did.

I prefer a 3D presentation with some weight/color.

Oh, since you have spares try them in the driver positions.

 

DeKay

trivema's avatar
trivema
148 posts
 

Pop in a Telefunken, Amperex bugle boy, Mullard, RCA blackplate, or sleeper giant Raytheon black plate, you’ll be even more impressed.  NOS 12AU7s cheaper than NOS 12AX7s so you can experiment on a lean budget. 

triton20trx
36 posts
 

I have a set of NOS preamp tubes I used for 2 months before I sold the Rogue Cronus Magnum II.  I bought them from Brent Jessee of AudioTubes.com.

3 Mazda 12au7, 2 GE 7025 (12ax7)  $450

The change from stock was extremely dramatic in all aspects.  Detail, soundstage, cleaner highs, punchy lows.  My thought was what amp is this and what did you do with the Rogue.

These tubes are just sitting in my drawer.  Feel free to DM me with questions 

dekay's avatar
dekay
5,805 posts
 

"not sure about those prices from Brent - ?"

What do you mean by that - too inexpensive?

The new production tubes you are using currently retail for $60+ per tube.

The tubes I mentioned are cheap as chips and they may further rock your world of tube rolling.

 

DeKay

 

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