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Rolled some 12ax7's recently...

Hi All,
I went through my supply of 12ax7's recently and found some goodies.
I recently compared Bugle Boys to Telefunkens in the phono stage of my pre-amp. Interesting (to me, at least). I found the Telefunkens to be nice sounding; very clean and clear, very nice detail, over all a very nice sounding tube. The Bugle Boys, however, were magical! WOW! Timbre was so much more apparent. The soundstage depth and width increased; especially the depth. The music seemed to come alive and glow. It was much more captivating.
I found such a dramatic difference between two high quality tubes very interesting.
I have yet to try 10m's, and 70's Mullards that I found. I will report when I do...
By the way, NOS Sylvania's sound nice in the line-level stage. All tubes reported are vintage NOS. I match them with my tube tester. And, I do not change the volume setting between tube brands tested.
Any comments are more than welcomed! I appreciate any information on your experiences with 12ax7's. The price of some of these NOS is incredible; I am glad to have these nice examples in my collection!
Cheers.
bicycle_man
nsgarch's avatar
nsgarch
2,524 posts
 
Bicycle_man, isn't that queen just too much!? It cracks me up every time I see his auctions!

Bob, I applaud your reminding us all of this:
. . . but making sure to go back and see if a change is ultimately an improvement, or just a change.
Human beings being the stimulation junkies we are, changes often seem 'better'. For at least a minute!!

Geary, I have also been cautioned about using 5751's if they would be in (active) RIAA circuits. Apparently passive RIAA circuits are not affected.

Neil
.
vernonwtx
53 posts
 
Tubes sound different in different preamps. Maybe someone can comment on the synergy of this.

I have a Jolida Envoy and a Symphonies, while TF ECC83's rank high in each, the Mullard 10M 12AX7 out shines everything in the Symphonies, but is not particularly interesting in the Envoy.
bicycle_man OP
100 posts
 
Thanks, Nsgarch! It burned me up to see that auction. After a little thought, I have reached the conclusion that I won't let the likes of him upset me. If people are willing to pay the prices he asks, it is their problem. Thank you for your supportive comment.

Perhaps the synergies between different tubes and amps has to do with the electrical properties of the tubes and the circuits they are plugged into. This sounds like stating the obvious. But, maybe the effects of the parameters are more profound than theory or expectations suggest. It is an interesting phenomenon!
cruz123
586 posts
 
Has anyone tried the Mullard Reissue 12ax7 and/or the new production Sovtek LPS 12ax7? They get good reviews over at Audio Asylum and the LPS's especially seem to have the rep of being exceptionally quiet. I've ordered some of each to try out in a VAC pre I just picked up. I thought I would try this route before blowing the inheritance on NOS.
pdreher's avatar
pdreher
1,194 posts
 
Cruz123 - The Mullard reissues are garbage IME, and the Sovtek LPS are moderately better. I've found you get what you pay for when it comes to tubes. Finding used NOS tubes in good condition can save you some money, but still expect to pay quite a bit more than the inexpensive current tubes previously referenced.
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