1958-1960 Twin
(Narrow Panel "Big Box" Twin)

Year:

 1958-1960

Model:

 Twin

Model No:

 5F8, 5F8-A

Config:

 Combo

Control Panel:

 Chrome top facing w/ white screened labels, controls numbered 1-12

Conrol Layout:

 Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Presence, Mid, Bass, Treb Bright Vol, Normal Vol, Bright In, Bright In, Normal In, Normal In

Knobs:

 Black pointer

Cabinet:

 Narrow panel, 20½" x 24" x 10½" (52.1 x 61 x 26.7 cm)

Cab Covering:

 Diagonal tweed or brown Tolex (60)

Cab Hardware:

 Leather Handle, glides

Grille:

 brown grille cloth

Logo:

 Cabinet mounted, Script "Fender Twin Amp" on rectangular tag

Weight:

 ?

Speakers/Load:

 2 x 12"/4 ohms (8 ohms each in parallel)

Speaker Model:

 Jensen P12N

Effects:

 None

Output:

 80-100 Watts

Preamp:

 Bright ½ 12AY7
Normal: ½ 12AY7
12AX7 shared by both channels

Power:

 4 x 5881

Bias:

 Fixed bias, nonadjustable

Rectifier:

 5F8: Mercury Vapor 83
5F8-A: GZ34

Phase Inverter:

 12AX7 (long tailed)

Comments:
  • A selenium rectifier was used in the bias circuit.
  • Two speaker jacks were wired in parallel were located under the chassis.