User Manual

SE 2 Channnel Amp
SE 50 Wa SE 30 Wa SE 20 Wa
Max Power Usage
250 Was 250 Was 250 Was
Pre Amp Tubes
3 each 12AX7/ECC83
3 each 12AT7
3 each 12AX7/ECC83
3 each 12AT7
3 each 12AX7/ECC83
3 each 12AT7
Power Tubes*
2EA EL34 2EA 5881 2EA 6V6
Fuses
120V 60Hz
Main
T2A 250V
Type IEC 5X20mm
T
1
.6A 250V
Type IEC 5X20mm
T
1
.5A 250V
Type IEC 5X20mm
100V 50/60Hz
Main
T2A 250V
Type IEC 5X20mm
T
1
.6A 250V
Type IEC 5X20mm
T
1
.5A 250V
Type IEC 5X20mm
230V 60Hz
Main
T
1
A 250V
Type IEC 5X20mm
T800mA 250V
Type IEC 5X20mm
T630mA 250V
Type IEC 5X20mm
Filament Fuses
2EA 10A 250V
Type IEC 5X20mm
2EA 10A 250V
Type IEC 5X20mm
2EA 6A 250V
Type IEC 5X20mm
B+ Fuses
T
1
A 250V
250V Type IEC 5X20mm
T800mA 250V
250V Type IEC 5X20mm
T630mA 250V 250V
Type IEC 5X20mm
Weight
Head
34.2 lbs (15.5 kg) 32.6 lbs (14.8 kg) 29.6 lbs (13.5 kg)
1x12 Combo
57.6 lbs (26.2 kg) 56 lbs (25.5 kg) 53 lbs (24.1 kg)
Dimensions
Head
21.5in X 10.5in X 9.5in
546mm X 241mm X 254mm
21.5” X 9.5” X 10”
546mm X 241mm X 254mm
21.5” X 9.5” X 10”
546mm X 241mm X 254mm
1x12 Combo
24” X 23” X 11”
610mm X 584mm X 279mm
24” X 23” X 11”
610mm X 584mm X 279mm
24” X 23” X 11”
610mm X 584mm X 279mm
Combo Speaker
Combo
12 Inch, 16 Ohm, 100W 12 Inch, 16 Ohm, 100W 12 Inch, 16 Ohm, 100W
Speaker Cabinet
2 X 12” Cabinet, 100 Was, 8 Ohm Input - Each Speaker: 12 Inch, 16 Ohm, 50W CA.
Dimentions
30” x 19” x 13” (762mm x 482mm x 330mm)
Weight
60 lbs (27.3 kg)
* Power Tubes should be purchased as matched sets. Use only tubes in pairs that are factory-matched. Failure to use matched tubes can lead to tube failure and amplifier
damage or abnormal operation.
SE 2 Channel Guitar Amplifier
User’s Manual
Tech Specs
Service Notes
Tubes
Tubes are consumables, as they have a given usable lifespan. They are part of the heart of
the tone, so keeping correctly operating tubes is essential. Tubes can fail catastrophically or
gradually, and it’s good to know what to look for if they start to go bad. Periodically inspect
them and look to see if anything inside the tube is glowing cherry red other than the normal
orange glow of the filament. This would indicate a situation where the tube is conducting
more current than it is capable of handling and most likely about to fail. Two other conditions
to observe are: 1) filaments not glowing or 2) a miniature fireworks display inside the tube. Any
of the above conditions indicate serious problems with the tube and should be taken care of
immediately. Tubes quite often are the cause of spurious noise in the amp. Microphonic tubes
will squeal or rale with the vibrations of the cabinet. If suspected, tap each tube lightly with
a pencil with the amp powered up—the suspect tube will let you know. Note that there is a
normal metallic clinking when doing this, but a microphonic tube will be quite loud.
Instructions for Qualified Service Technician:
To install the tubes, check that the power cord is not plugged in, then remove the metal back
panel with a screwdriver and notice the tube sockets. Looking from the back, install the Power
tubes (EL34, 5881, etc.) in the sockets. In each case, align the center pin guide correctly with
the socket, making sure that the pin guide key fits with the corresponding slot in the socket.
The preamp tubes can then be placed in the smaller 9-pin sockets. Please refer to the tube
chart in this manual (inside panel 4) for proper tube locations. Be aware of the pin alignment
with these, as there is only one way they can fit. We utilize tube sockets that allow relative
ease of tube installation, but never force tubes into the sockets if there becomes a problem.
Also, never torque the tubes, only gently rock them from side to side during insertion or
removal. After preamp tube installation, place the cylindrical spring tension preamp tube
covers over the tubes.
Replacing preamp tubes will not require any adjustment, but the power tubes will need
rebiasing to assure proper operation. After power tube replacement, initially inspect the tubes
often to assure there are no “cherry red” components within the tube. Tubes today can have a
wide variety of tolerances and a re-bias is highly recommended with new ones.
Suggested Tube Biasing:
SE 20 - 6V6, 21mV
SE 30 - 5881, 35mV
SE 50 - EL34, 37mV
Note to set your meter to millivolts for your reading. Failing to do so could cause the amp to
be incorrectly biased and could damage the tubes and/or the amp.
Fuses
There are 4 fuses installed in the amplifier. One of these fuses is accessible on the back panel,
the main fuse. The B+ fuse is located on the boom side of the chassis.There are two
fuses internally for added safety. The B+ fuse is a high voltage fuse, and two internal fuses
are for the lower filament voltages. In all cases, labels indicate the type and rating of
the fuse. Replacement fuses MUST BE THE SAME TYPE AND RATING. If they are not, you
can permanently damage your amplifier. Please contact your local PRS dealer or the PRS
accessories web site for information on ordering replacement fuses.
Instructions for Qualified Service Technician: Replacement of internal fuses requires removal
of the back panel and removal of the chassis. First, ensure the power cord is not plugged in,
then remove the back panel with a screwdriver. Loosen the 4 bolts holding the chassis to the
top of the cabinet. Check that all components are cool so that burns do not occur. Then, by
holding onto the transformers, carefully pull the chassis out.
NOTE! Capacitors may retain an electric charge and can be dangerous even when the unit is
o, unplugged, and has not been played for an extended period of time. USE CAUTION!!!!
Locate the fuse holders, remove fuses, and check for continuity. Blown fuses can indicate a
failure condition and should be treated as though a problem exists. Check the label for the
proper type and rating. After all fuses have been replaced and the amp is tested as acceptable
and safe, reinstall the chassis by working in reverse. Be sure to replace the reverb pan and
hardware, then plug the reverb cords back into place.