Audio Innovations Classic 25 visiting the system.

fiddlefye

Senior Member
Yeah, tube rolling is all kind of a best guess thing. Experience can help narrow it down some, but you still don't know what will happen until you plug it in.

This hobby can drive you nuts...
Yes, it can drive you nuts sometimes. I finally had to replace the small tubes in my CJ MV-45 earlier this year and the recommended compliment is not at all to my liking, just lost the sweet magic the amp is capable of. Still pondering what to go with, especially as I'm not sure just what the 12 AX7s were that were in there. Something Canadian, but other than that...
 

prime minister

Site Owner
Staff member
Yes, it can drive you nuts sometimes. I finally had to replace the small tubes in my CJ MV-45 earlier this year and the recommended compliment is not at all to my liking, just lost the sweet magic the amp is capable of. Still pondering what to go with, especially as I'm not sure just what the 12 AX7s were that were in there. Something Canadian, but other than that...

How many 12AX7 do you need?
 

fiddlefye

Senior Member
Wanna give a pair of killer Mullards a try? Might help you narrow down what you are looking for. As I said, they are just sitting here, collecting dust. Try then for a while and then send them back whenever you know.
That would be amazing. I need to try some good things and see what it really needs. It was lovely with what it had, but after a couple of decades (yes, they lasted that long!) one finally ran out of steam. I got a pair of JAN Phillips on recommendation from Parts Connexion, but they sounded dull and dark. I've had the same tubes in the PV-12 and Opera PM-1 and in both of those cases I found them bright and hard. Just goes to show you that there is no definite character to a tube outside of the context!

And.... we're coming up on cooler weather again and the MV-45 can come back out to play soon! Not that the MC250 isn't doing a fine job - far better than I would ever have imagined a mid-60s SS amp was capable of.
 
From my experience with other tubes (not 12AX7), all of the JAN Phillips tubes that came out of the PA factory in the mid-1980s are warm, dark and dull, just like Fiddlefye said. But sometimes that type of sound works out great. At least that's what I have found with the JAN Phillips 5687 and 5U4GB. In many applications where I use these tubes (but not all!), the JAN Phillips are my favorites. I recall reading that Audio Note UK recommends the JAN Phillips 5687 for their preamps and DACs.

The only 12AX7 component I have these days is a spare phono preamp that uses a pair of them. My favorite in that spot is a Siemens ECC83.
 

fiddlefye

Senior Member
From my experience with other tubes (not 12AX7), all of the JAN Phillips tubes that came out of the PA factory in the mid-1980s are warm, dark and dull, just like Fiddlefye said. But sometimes that type of sound works out great. At least that's what I have found with the JAN Phillips 5687 and 5U4GB. In many applications where I use these tubes (but not all!), the JAN Phillips are my favorites. I recall reading that Audio Note UK recommends the JAN Phillips 5687 for their preamps and DACs.

The only 12AX7 component I have these days is a spare phono preamp that uses a pair of them. My favorite in that spot is a Siemens ECC83.
Warm, dark and dull is how the JAN Phillips turned out in the MV-45, but farther up the chain they were the exact opposite. If I understand correctly the JAN tubes were overbuilt for military use and it might explain why their characteristics are a bit different in some ways. If I have my information correct on that it would also explain why there seem to be a lot more of them available than other NOS tubes of the same general time period.

in the end it is always the balance of all of the tube choices in the chain combined that creates the end result. So many options, so little time (and funds)!
 
Hi, I have an Audio Innovations classic 25, which I recently re-acquired from a previous life. It’s paired with a set of B & W 603 speakers and an Arcam Aplha 5 Plus CD player - it still sounds amazing.
Since I have a different home system now, I was thinking of trying to sell this one. So you guys think it is still worth something ?
 
Hello from Belgium,
I'm new to this forum, have been swapping gear left and right , Sansui AU7900, 505,101 on beautifully restored JBL L166 to finally finally end up with a pair of Tannoys 3808 with custom xover and yes, an Audio Innovations Classic Stereo 25 which I connected to a custom LencoL75/SME3009 and as a "cheap" streamer a RasberryPi/ Dragonfly Cobalt/Volumio/ Tidal.
Probably my hearing is polluted as I need to detox from that fat Sansui sound I have now for approx. a year. Or, the tubes have had their time, 4* EL34 Svetlana, 2* ECC803S telefunken, 1*ECC83 telefunken and finally 2* 12AU7A Audio Voice. The Reason why I say this, the mids and highs are detailed, voices sound great but I do miss something ? also, I have the impression that the sound sometimes goes to the background, never heared that in recording before. Not sure, not an expert here but I'd like to play around and hope to improve this beautifull amp. Any suggestions from the experts here?
Also is there any manual available, it's like it never existed, the web is pretty empty on this device.
 

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Swapped the EL34 to Genalex Gold Lion KT77, now I know what was missing... amazing
I assume you mean the GL Reissue? If so I totally understand. The GL KT-77 is one of my favorite tubes. And if yours are new, the best is yet to come. The bass will fill out rather dramatically after a very long breakin, maybe 50-100 hours.
 
I assume you mean the GL Reissue? If so I totally understand. The GL KT-77 is one of my favorite tubes. And if yours are new, the best is yet to come. The bass will fill out rather dramatically after a very long breakin, maybe 50-100 hours.
Indeed the GL reissue. As this is my first Tube Amp experience I'm quite satisfied with what this jewel produces. Nothing I heared before comes even close and that for an Amp that has almost no info on the web...
 
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