using equivalent tubes, is it possible?

[sander78]

Hi!,
I'm wondering if I could replace my 12ax7 pre amp tubes by equivalent types. Most (radio) engineers wil say it is equivalent so, yes...(just like transistors).
The reason I ask is because I’m thinking of replacing my pre amp tubes in my mesa caliber 50+ because I have allot of feedback when I use a high gain at a high volume on the lead channel.
They are somewhat expensive though, and now a college of mine showed me his collection of new and used tubes which he collects as it were stamps
I didn’t find the 12ax7 type but I did found allot of the ECC83 and 12DT7 which according to this site: http://www.hupse.nl/radio/tubes/12AX7.htm should be equivalent.

Does any one of you have experience with this?

 

[kirk19]

ecc83 is exactly the same as a 12ax7 just another name for the same kind of tube

 

[Boogiebabies]

Amperex, Brimar, EI, Electro Harmonix, Fender, Fisher, Fivre, GE, Groove, HH Scott, JJ, Mojo, Mullard, Philips, Raytheon, RCA, RFT, Ruby, SED, Siemens, Sovtek, Swetlana, Sylvania, Telefunken, Tesla, Tung-Sol, Tungsram, Westinghouse.

Good lord !!! It's like Heaven. I would be all over the RFT's, Telefunkens, Phillips, Sylvania, Amperex, Brimars and I am wiping up the slobber from the Mullards. Some of those Fender, Fisher, HH Scott and Westinghouse are usually relabels of the other NOS tubes.

Sweet.

 

[LHanson]

I use a 12AU7 in my V1. Smooths out the lead channel somewhat, and makes the other channel sparkle.

edit- also consider that a great high-gain low volume setting won't necessarily sound good when you turn up the master volume. I know I have to reduce highs and presence and reverb when I turn up. It's not unusual for a Boogie to go into oscillation when too much gain is applied at high volume. Just play with the amp, it's very flexable so it can get out of control.

 

[sander78]

thanks!

 

[Dutchman]

I'm curious if anyone has tried these conversion power tubes in a Mark series amp yet,

http://www.vacuumtubes.com/6BG6.html

If they would work it would be a new supply of 7581A's