#1
I was inspecting the inside of my Bassman because I'm thinking of doing a retube. The amp is suppose to have 3x7025s (12AX7s) and a 12AT7 for a phase inverter.

However upon looking inside I noticed that there is one 7025 and three 7448's (one in the phase inverter slot).

I've tried looking them up to see what the modern version of the 7448 is and I wasn't able to find any information. Does anyone know anything about these tubes?
#2
They'd just be a variation on the 12AX7, with a different tone. Most likely discontinued, and there's no real "modern version" of tubes, Current Production tubes are basically down to your simple tubes, 6L6's, 6V6s, EL34s, 6550s, KT88s, KT77s, KT66s, 12AX7s and a few close variants.

Not too sure on the specific details of the 7448, don't think I've heard of it before either.
My Gear
Guitars
Cort VX-2V
Basses
Stagg BC300
Amps
Marshall JCM900 4100 DR
Marshall 1965A
Hartke HA3500 Combo
#3
Quote by Jesstaa
They'd just be a variation on the 12AX7, with a different tone. Most likely discontinued, and there's no real "modern version" of tubes, Current Production tubes are basically down to your simple tubes, 6L6's, 6V6s, EL34s, 6550s, KT88s, KT77s, KT66s, 12AX7s and a few close variants.

Not too sure on the specific details of the 7448, don't think I've heard of it before either.


I didn't necessarily mean a modern version, I meant if they are under a different name now (i.e. 12AX7s use to be called 7025's, and now are referred to as 12AX7's or ECC83's)