sam6550a
Headphoneus Supremus
The 7025 and the 12AX7 both have the same amplification factor, 100.From my experience, a 7025A twin triode splits the gain betwixt a 12AX7A and a 12AT7A. Are 7581A beam power tubes, which are pin-compatible with the 6L6 and 6V6 series, still manufactured?