ON / STANDBY
– Switches the amp from “
STANDBY
” to functioning “
ON
”. Best turn the AC power
switch to “
ON
” first and wait about 30 seconds before turning
STANDBY
to “
ON
”. This will prolong
tube life. When turning the amp off, switch AC power to “
OFF
” first. This allows the power to drain out
of the amp circuit.
INDICATOR
– Indicates amp power status. If this light does not come on when switching on the amp,
double-check your AC power source or check to see if the
MAINS FUSE
is blown.
CAUTION: UNPLUG THE AMPLIFIER FROM AC POWER BEFORE CHECKING THE FUSE!!!
If the fuse is blown, this indicates either a problem with your AC source or with the amplifier.
ONN / OFF
– The AC power
ON / OFF
switch.
REAR PANEL:
FOOTSWITCH
– this is a mono jack that activates the
BUMP
circuit.
IMPEDANCE
– all 65 Amps 212-Combos and Extension Cabinets are wired for
16-ohms
(two 8-ohm
speakers in series / 2x12 or one 16-ohm speaker / 1x12). If using two 16-ohm cabinets, set
IMPEDANCE
to
8-ohms
. Always be sure to match the impedance of this amplifier with the impedance
of the speaker cabinet you are using. The Stone Pony is switchable between
8
and
16 ohms
.
SPEAKER OUTPUTS
– Two speaker outputs in parallel.
H.T. FUSE
(SLO-BLO)
- This slow-blow type fuse is in line with the DC voltage in the amp (
H.T.
stands for “High Tension”). When the
H.T. FUSE
blows, it is typically a sign of a bad power tube.
Correct amperage of the
H.T. FUSE
is written on the chassis.
MAINS FUSE (SLO-BLO)
- This slow-blow type fuse is connected to the AC primary side of the Power
Transformer. Correct amperage of the
MAINS FUSE
is written on the chassis.
CAUTION
– NEVER USE A FUSE WITH A HIGHER AMPERAGE RATING. NEVER
REPLACE A FUSE WITH ALUMINUM FOIL OR OTHER CONDUCTIVE MATERIAL.
DOING SO IMPOSES EXTREME DANGER, POTENTIALLY DAMAGING THE AMPLIFIER
AND VOIDS WARRANTY.
TUBES:
(from left-to-right looking from the rear)
PRE-AMP TUBES:
EF86
– 12AX7 (ECC83) – 12AX7 (ECC83)
POWER TUBES:
7591
– 7591 (brand: JJ Electronic)
RECTIFIER:
5AR4
This amp is cathode-biased and requires no internal bias adjustment when replacing the 7591 power
tubes. You can use any brand of 7591 tube in this amp. However, after extensive experimenting with
the current production tubes, our favourite 7591 tube for this amp is from the JJ brand.
IMPORTANT:
We recommend a qualified technician for re-tubing. Tubes using the same size socket
can have very different wiring configurations and voltages. Placing the wrong tube in the wrong socket
can cause damage to the amplifier and the tube.
