Fender Twin Amp User Manual download pdf (Page 7)

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FIG. A

TYPE: PR 449

PART NUMBER : 021-5700-000 (120V, 60Hz) USA,

021-5760-000 (230V, 50Hz) Europe

021-5740-000 (230V, 50Hz) UK,

021-5730-000 (240V, 50Hz) Aust

021-5770-000 (100V, 50/60Hz) Japan

POWER REQUIREMENTS : 360W

POWER OUTPUT : 100W RMS (Full Output), 25W RMS (1/4 Output)

1kHz sine into 4 ohms @ <5% THD (Presence @ “1”)

INPUT IMPEDANCE : 1M ohm

TUBES: Four 6L6GC (P/N 053980), Two 12AX7A (P/N 023572),

Five 12AX7WA (P/N 013341), One 12AT7 (P/N 023531)

FUSES F200: T4A 250V (110V, 120V units), T2A 250V (230V, 240V units)

F 2 0 1 : T5A 250V (Internal Filament Fuse, 230, 240V units)

F1 & F2: T100mA (all units)

SPEAKERS : Fender 12 in., 8Ω, (P/N 037617)

FOOTSWITCH : 4-Button: Channel, Effects Loop, Reverb, Tremolo (P/N 057025)

D I M E N S I O N S Height: 19 7/8 in. (50.7 cm)

Width: 26 3/8 in. (67.3 cm)

Depth: 12 27/32 in. (32.8 cm)

W E I G H T : 80 lbs. (36.3 kg)

Product specifications are subject to change without notice.

Tube life span depends upon things such as amplifier load and

playing style. Power amplifier output tubes have a shorter life

span than pre-amplifier tubes and usually need attention first.

A simple way to check if your tubes are noticeably worn, is to

replace them with a spare new set and listen for any

improvement in tone quality:

A L WAYS unplug the amplifier when replacing tubes.

Replace tubes ONLY with the proper type

(see “Specifications” below).

CAUTION: let tubes cool before handling, they get HOT...

1. Replace the OUTPUT tubes (V9, V10, V11, V12 in FIG. A)

with a new set. Set BIAS and BALANCE. Listen for any

improvement.

2. Keep the new OUTPUT tubes in place. Replace the PRE-

AMPLIFIER tubes (V1, V2, V3, V4, V5, V6, V7, V8 in FIG. A)

with a new set. Listen for improvement.

3. Keep the new PRE-AMPLIFIER tubes in place. Put the

original OUTPUT tubes back in the amplifier. Set BIAS and

BALANCE. Listen for any improvement.

If there is a noticeable improvement in sound quality after any

of the 3 steps above, keep the tube arrangement that sounds

the best. Obtain new spare tubes for future testing and tube

replacement.

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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Fender Twin Amp User Manual Page 7

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