Help me identify this 12ax7a

[12afael]

I found a British company that should have it Golden Dragon Tubes - Vacuum Tubes

 

[ruffrecords]

My two pennyworth. Most of these amps use little if any negative feedback. This means the characteristics of the sound are determined very much by the specific tube; not the model or the brand of tube but the specific tube. One way to test this is to try the tube you think creates the sound in te the replica amp. If it does then what you need to do is find a tube with the same characteristics. So if you can put it in a tube curve tracer at least you would have a record of what you are aiming for that you could test other tubes against. However, it may just be that the tube in the original sounds the way it does because it has 30 years of regular use so finding one with identical characteristics may not be possible.

Cheers

Ian

 

[12afael]

yeah guitar amps have very rarely feedback on the preamp if they are full tube. when I tried that tube on the donor amp automatically gets 85% there very close to the artist one. I measured the curve so it will just take time to find one that behave similar. I don´t know if it is specific to the tube yet. This week I should receive some NOS to try. I don´t think the tube have 30 years. I think this guy have a very savy technician that know about sound.
I had a discussion with the technician of John Petrucci from Dream Theater last week. We were talking about sylvania 6L6s that were used on mesa IIc+ and the revered Peavey 5150 block letter. reading about that tube I found that those two amps used the same shuguang tube on the preamp. IIc+ is from ´84 and 5150 in ´92.

Interesting fact is that Sylvania closed on ´59. According to James Brown (5150 designer) Hartley Peavy bought those tubes in the 80s.

Shuguang closed on 1996.

 

[Sistersandoz]

Im currently search for some for my 84 Mark IIC+. I Sold a quad years ago with Peavey markings. Huge regret. Mesa marked them as STR- 415