Svt 4 pro tubes??

[t bake]

Would like to know what tube were installed from mfg. Amp was produced aprox 03 ser#btcdp70056 any input on this is appreciated thanks.

[booj]

Sovtek 12AX7WA's. There may have beena 12AU7 in there too. just google around.

[Enzo]

The power amp is solid state, the preamp indeed used three 12AX7.

If you are concerned with brands of tubes, the factory would have used whatever tube they could reliably obtain in production quantities at the time.