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External speaker outputs ("Goldtone" GA-30RVS only)
These have been provided so that the user can connect them to external 16Ω speaker
cabinets, such as 4 x 12's, for different sounds. This is useful for both live and studio use
and will radically change the sound and volume of the amplifier.
As the "Goldtone" GA-30RVS has two power stages, two external speaker outputs are
provided, as is a 8Ω or 16Ω impedance selector switch which sets the output impedance
for both sockets. (N.B. This does not change the impedance of the internal speaker
connection)
When a jack is inserted into each socket the corresponding internal speaker is
disconnected, either or both can be used at once.
However, always ensure that the amplifier is correctly loaded when in use and never
plug both power sections into the same speaker cabinet unless it is a stereo cabinet and
you are sure that the speakers are separately addressed.
Probably the most popular way to use these outputs is to sit the unit on top of a stereo
4 x 12 cabinet, set the switch on the "Goldtone" GA-30RVS to 8Ω, the cabinet to 8Ω
STEREO and connect the two speaker outputs to the two cabinet inputs for a big stereo
sound.
Alternatively if you really want to create an impression set the "Goldtone" GA-30RVS to
16Ω and get TWO 4 x 12's, set to 16Ω MONO, to plug into. With the cabinets spaced
apart a reasonable distance the sound is huge! Especially considering that the cabs are
being driven by two fifteen watt amps. Adding a stereo chorus or delay to the effects loop
at this stage is quite simply more than a poor boy can take!
Pentode/Triode Switch ("Goldtone" GA15RV only)
This allows the user to set the power stage to either PENTODE or TRIODE operation.
PENTODE position is the full power mode and has generally a more powerful sound with
a spread of both even and odd harmonics, when pushed into distortion.
TRIODE mode produces around half as much power. Therefore has less headroom and
produces power amp distortion earlier. It also has less high frequency content, therefore it
is not as bright as pentode mode, and produces mainly even order harmonics.
The choice as to which mode to use will depend on several factors including playing
situation, instrument used and, most importantly, personal taste.
Power switch - Off/Standby/On (All Models)
As the name implies, this switches the amplifier from OFF to STANDBY mode,where only
the valve heaters are on, to ON for actual use. This should be used correctly every time
the unit is used to prevent problems with valves and to increase their life.
Before mains is applied to the unit, check that it is the correct voltage and make sure the
POWER switch is in the OFF position. Connect power lead to mains outlet then switch to
STANDBY and wait about a minute before switching to ON. This ensures that the valves
have time to warm up before large voltages are applied to the plates.
7
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