TUBES
Prosonic Combo
The Prosonic Combo's tube complement consists of 1 pair of Fender special design 5881/6L6WGC’s (part #099-5090),
5 Fender special design 12AX7A’s (part #099-5091), 1 special design 12AT7 (part #099-5092) and 1 5AR4/GZ34 (part #
099-5097).
Prosonic Head
The Prosonic Head's tube complement consists of 1 pair of Fender special design 5881/6L6WGC’s (part # 099-5090),
4 Fender special design 12AX7A’s (part #099-5091) and 1 5AR4/GZ34 (part #099-5097).
Tube Replacement
Tube life varies with playing style and application with power tubes having a much shorter life than pre-amp tubes - which
can last for years. For continued optimum performance from your amplifier, the tubes should
ONLY
be replaced with
the same type tubes as specified on the tube location label inside the cabinet.
A simple way to check if the tubes are worn is to replace the set in your amp with your spare set. (You do carry spare
tubes and fuses, don't you?)
- First, replace the OUTPUT tubes in the amplifier and listen.
- Next, re-insert the original output tubes. Replace the PRE-AMP tubes and listen.
- Finally, try replacing both the OUTPUT and PRE-AMP tubes and listen.
If there is a marked improvement in the tone of your amp at any point in this procedure, leave the new tubes in your amp
and purchase another spare set.
When changing the tubes,
ALWAYS
unplug the amplifier and remember
THE TUBES ARE HOT!
Either wait for the
tubes to cool or use an insulated oven mitt to remove them from your amplifier.
COVERING CARE
To clean the Tolex covering, use a sponge and a light soapy water solution. (Do not use flammables). ALWAYS unplug
the amplifier before cleaning or approaching it with fluids. Avoid spilling liquids on operating surfaces, grill cloths, controls,
switches and speakers.
TROUBLESHOOTER’S CHECKLIST
If the amp is set up but does not function, check the following items
-Is the amp power cord properly plugged into an electrical outlet?
-Is there power to the outlet?
-Is the fuse blown?
-Is the speaker(s) properly connected to the amplifier?
-Is the amp on standby?
-Is the Rectifier tube lighting? Try switching to the solid-state rectifier (Position 3)
-Are the amplifier VOLUME, TREBLE, MID and BASS controls above 0?
-Is the instrument volume control turned up?
-Is the A/B switch selecting the proper channel? (Try Both volume controls).
-Is the instrument plugged into the amplifier?
(Eliminate any effects pedals and try another guitar cord.)
Check under all tube covers to see that the tube filaments are glowing.
If, after checking all of the above, your amplifier is not performing correctly, consult your authorized Fender service center.
