Ampeg SVT-3 Pro Tube Questions

[randysmojo]

It sounded decent, but didn't have the volume I needed and was a little slow on response. The notes didn't come out real hard and fast if that makes sense. I was looking for a new amp at that time. Now, with these tubes, it has more volume than my cabinet wants, the note response is great and the tone is perfect to my ears. I love it now and don't want anything else!!!

 

[fuadramsey]

Okay so where can I find these tubes, and how much will they cost for all of them:

driver slots:
NOS RCA 12AX7 (17m plate)
NOS RCA 12AU7 (17m plate)

tone section:
(3) Tung-Sol 12AX7 (17m plate)

Thanks!

 

[Smithandbacon]

Hello, I'm new to the forum. I found this thread as I was accidentally provided with a 12at7 v/s the stock 12au7 in the 12au7 socket and wanted to gain input from others who may have tried this mod or substitution. After using both in my svt 3 pro, I have noticed more gain from the "au" than the "at" although the "at" seems to have more clarity from less swelling lows. And is my preference at the moment. I am now concerned that it may endanger other internal components. Anyone have experience on the matter?

 

[B-string]

Interchanging 12AU7/AX7/AT7/AY7 won't cause any support component troubles. Different gain and current specs between them doesn't stress any parts.

 

[Dozza]

I just bought this SVT-3 Pro with the stock (SovTek) tubes, and it sounded terrible (No volume, soft/furry at every gain level). I had a few tubes lying around, so threw them in, and it's better, but not fantastic (The bass is very soft/furry, and it's overly middy. If I try to bring up the bass or lower the mids, I lose all definition.). Right now, I have a mix of Sylvania and RCA (all vintage, ca 1959-1963) 12AU7 WA with one 12AX7. I realize this is pretty much the opposite of how it came from the factory, but that's what I had. I am ready to get better tubes, but need to know what y'all are using for that awesome Ampeg tone. I really like to be able to get good and clean, but want to have that classic overdriven Ampeg sound on tap when I turn up the gain. So, what do I go with?

If you have a preferred brand, that's good information to have, too, so please share

I had the same problem. The tubes were as per factory configuration (didn't change anything) AND simply had the bias reset. Fixed the problem and put a big smile on my face.