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FIG. A
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 LWAYS unplug the amplifier when replacing tubes.
Replace
tubes
ONLY
(see "Specifications" below).
CAUTION: let tubes cool before handling, they get HOT...
TYPE :
PART NUMBER :
POWER REQUIREMENTS :
POWER OUTPUT :
INPUT IMPEDANCE :
TUBES :
FUSES
F1 & F2:
SPEAKERS :
FOOTSWITCH :
D I M E N S I O N S
Height:
W E I G H T :
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with
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PR 449
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
360W
100W RMS (Full Output), 25W RMS (1/4 Output)
1kHz sine into 4 ohms @ <5% THD (Presence @ "1")
1M ohm
Four 6L6GC (P/N 053980), Two 12AX7A (P/N 023572),
Five 12AX7WA (P/N 013341), One 12AT7 (P/N 023531)
F200:
T4A 250V (110V, 120V units), T2A 250V (230V, 240V units)
F 2 0 1 :
T5A 250V (Internal Filament Fuse, 230, 240V units)
T100mA (all units)
Fender 12 in., 8
4-Button: Channel, Effects Loop, Reverb, Tremolo (P/N 057025)
19
in.
7/8
Width:
26
in.
3/8
Depth:
12
in.
27/32
80 lbs.
Product specifications are subject to change without notice.
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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.
original OUTPUT tubes back in the amplifier. Set BIAS and
type
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.
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P/N 037617)
(50.7 cm)
(67.3 cm)
(32.8 cm)
(36.3 kg)
7
www .mrgearhead.net
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