Maybe this will help. Back in the late 1980's Threshold offered two preamps, the FET nine and FET ten. These had silver badges. The FET nine came with a built in phono section. In the top of the line FET ten, you could buy the line level or the phono level units separately. Threshold called the line level a FET ten/hl (for high level) and the phono is called a FET ten/pc (for phono cartridge).
Around 1990 Threshold introduced its "e" line of amps and preamps. These have gold badges. The FET nine/e remained a combination preamp, and the FET ten/e was either line level or phono. Apparently to distinguish the two, the current Threshold company now calls the FET ten/e line level the "he" and the phono level the "pe". But at the time they were produced both units were labled FET ten/e.
Of course your T3i came along years after the introduction of the FET ten/e. It appears they share the same gold badge and fascia bolts. So where is the matching phono section for the T3 or T3i? It's little sister, the Forte F44, offered the phono section as a additional circuit board to be included inside the same chassis. Maybe something similar was available for the T3. Forte also offered the FP1, a separate phone stage in its own chassis. As you may have noticed, secondhand e line amps and preamps are a little harder to find than their earlier counterparts.
Around 1990 Threshold introduced its "e" line of amps and preamps. These have gold badges. The FET nine/e remained a combination preamp, and the FET ten/e was either line level or phono. Apparently to distinguish the two, the current Threshold company now calls the FET ten/e line level the "he" and the phono level the "pe". But at the time they were produced both units were labled FET ten/e.
Of course your T3i came along years after the introduction of the FET ten/e. It appears they share the same gold badge and fascia bolts. So where is the matching phono section for the T3 or T3i? It's little sister, the Forte F44, offered the phono section as a additional circuit board to be included inside the same chassis. Maybe something similar was available for the T3. Forte also offered the FP1, a separate phone stage in its own chassis. As you may have noticed, secondhand e line amps and preamps are a little harder to find than their earlier counterparts.