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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
"Specifications" below).
CAUTION: let tubes cool before handling, they get HOT...
MODEL / TYPE
PART NUMBER
POWER REQUIREMENTS
POWER OUTPUT
INPUT IMPEDANCE
TUBES
FUSES
( I n t e rnal Filament Fuse)
S P E A K E R S
FOOTSWITCH
DIMENSIONS
WEIGHT
w w w
.f e n d e
T
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b
e
R
e
T
u
b
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R
e
with
the
proper
type
S
p
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c
i
S
p
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c
i
Concert Reverb-Amp / PR 450
021-5900-000 (120V, 60Hz) USA,
021-5960-000 (230V, 50Hz) Europe
021-5940-000 (230V, 50Hz) UK
021-5930-000 (240V, 50Hz) Aust
021-5970-000 (100V, 50/60Hz) Japan
325W
50W RMS (Full Output)
12.5W RMS (1/4 Output)
1kHz sine into 8 ohms @ <5% THD,
(Presence @ "1")
1M ohm
Two 6L6GC (P/N 053980)
Two 12AX7A (P/N 023572)
Five 12AX7WA (P/N 013341)
One 12AT7 (P/N 023531)
F200:
F3A 250V (110V, 120V units)
T2A 250V (230V, 240V units)
F201:
T5A 250V (230V, 240V units)
F1 & F2:
T100mA (all units)
Four Fender 10 in., 8 ohm, (P/N 048832)
Four–Button: Channel, Loop,
Reverb, Tremolo (P/N 057025)
Height:
25
in.
(65.7 cm)
3/4
Width:
25
in.
(64.7 cm)
3/8
Depth:
12
in.
(32.8 cm)
27/32
85 lbs.
(38.6 kg)
Product specifications are subject to change without notice.
r. c o m
p
l
a
c
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p
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a
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m
e
n
1. Replace the OUTPUT tubes (V9, V11 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
BALANCE. Listen for any improvement.
(see
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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www .mrgearhead.net
t
t
Pro Reverb-Amp / PR 448
021-5500-000 (120V, 60Hz) USA
021-5560-000 (230V, 50Hz) Europe
021-5540-000 (230V, 50Hz) UK
021-5530-000 (240V, 50Hz) Aust
021-5570-000 (100V, 50/60Hz) Japan
325W
50W RMS (Full Output)
12.5W RMS (1/4 Output)
1kHz sine into 8 ohms @ <5% THD
(Presence @ "1")
1M ohm
Two 6L6GC (P/N 053980)
Two 12AX7A (P/N 023572)
Five 12AX7WA (P/N 013341)
One 12AT7 (P/N 023531)
F3A 250V (110V, 120V units)
T2A 250V (230V, 240V units)
T5A 250V (230V, 240V units)
T100mA (all units)
One Jensen 12 in., 8 ohm, (P/N 057065)
Four–Button: Channel, Loop,
Reverb, Tremolo (P/N 057025)
17
in.
(44.3 cm)
3/8
25
in.
(64.7 cm)
3/8
12
in.
(32.8 cm)
27/32
75 lbs.
(34 kg)
Put the
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