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FUSE:
This is the A.C.’s ( Alternating Current ) main fuse and provides protection from outside A.C. fluctuations,
as well as power tube failure damage. Should the FUSE blow, replace it with the same rating in a slo-
blo type package. The domestic U.S. version requires a 2 Amp SLO-BLO FUSE. A power tube short or
failure is often the cause of a blown fuse...Follow the cold start procedure mentioned earlier in the ON
/ STANDBY switch section and watch the power tubes as you flip the STANDBY to the ON position. If a
power tube is going bad or is arcing you will see it! Flip the STANDBY switch to STANDBY immediately
and replace the faulty power tube and the fuse if necessary. If you see nothing abnormal as you lift the
STANDBY switch, it is possible that a power tube shorted temporarily and blew the FUSE. If this is the
case it may work again normally. To be extra safe you may want to replace all power tubes in the troubleshooting tradition and save
the replaced set as spares. Carry along a few extra fuses for they too could be worth their weight in gold some day.
RECORD / PHONES:
This jack provides direct-to-console interfacing for recording or sound reinforcement applications. It
can also be used to power a set of personal headphones which is a convenient way to practice day or
night privately. It is a circuit dedicated to reproducing the roll off that occurs in the output section with a
speaker connected.
The send level strength is determined by the GAIN and MASTER controls. From this jack, adequate
signal level will be available to you for most of your recording needs and live direct performances.
FX LOOP: SEND & RETURN
These two 1/4" jacks are the patch point for external effects. The Effects Loop is
wired in parallel with the normal signal. Connect the SEND jack of the F-Series to
your Effects Input jack. Connect the RETURN jack of the F-Series to the Output jack
of your effect unit. The Effects Loop is a patch point between the pre-amp and power
section. Therefore, the RETURN jack can double as a “Power Amp Input” jack.
When the RETURN is used as an input, the F-Series FX MIX control is the only
control being utilized regardless of the mode selected and should be set to 100%. While the RETURN is being used in this manner,
all other controls are inactive.
FX MIX
10%
SILENT RECORDING
MUTE SPKR ON
8 OHM
COMBO
SPEAKERS
FUSE
FOOTSWITCH
SOCKET
BELOW
RCORD / PHONES
STEREO / MONO
FX SEND RETURN
4 OHM
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
chassis.
POWER FUSE
2A
SLO
BLO
120 V~
60 Hz
2A
100%
WARNING
: To reduce risk of fire or
electric shock, replace fuse with
same type and rating only. Do not
expose this unit to rain or moisture.
WARNING
: To reduce risk of fire or electric
shock, Do not remove cover. No user-
serviceable parts inside. Refer
servicing to qualified personnel.
OOGIE
B
M
ESA
F-Series All Tube Amplifiers
Handbuilt in Petaluma, CA
4 OHM
USE WITH 8 OHM SPEAKERS
REAR VIEW:
RECORD / PHONES
STEREO OR MONO
2A S.B.
F
U
S
E
F
U
S
E
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
chassis.
POWER FUSE
2 A
SLO
BLO
120 V~
50-60 Hz
2 A
FOOTSWITCH
SOCKET
BELOW
RECORD / PHONES
STEREO OR MONO
2A S.B.
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
chassis.
POWER FUSE
2 A
SLO
BLO
120 V~
50-60 Hz
2 A
FOOTSWITCH
SOCKET
BELOW
F
U
S
E
F
U
S
E
RECORD / PHONES
STEREO OR MONO
2A S.B.
WARNING
:
Unplug power
before replacing
fuse or removing
bolts mounting
chassis.
POWER FUSE
2 A
SLO
BLO
120 V~
50-60 Hz
2 A
FOOTSWITCH
SOCKET
BELOW
F
U
S
E
F
U
S
E
FX
SEND
RETURN
FX MIX
10%
PREAMP PATENT
4,701,957
100 %
F-50
REAR PANEL: