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GIBSON 'GOLDTONE' GA-15RV
The GA-15RV is part of the Gibson 'GoldTone' valve guitar amplifier range. It is a no
nonsense, compact, purists valve guitar amplifier and has the minimum controls necessary to
produce a good range of sounds, from clean to overdriven, into its single speaker.
The circuit topology has been based on traditional guitar amplifier designs, with new ideas
incorporated where beneficial.
The main preamp and power stage sections are 100% valve. The valves used are two
ECC83/12AX7's and two EL84/6BQ5's run in Cathode Biased Class A.
CONTROLS
INPUTS - HI & LO/LINK
Two jack sockets are provided for connection to your instrument.
The HI input is a high impedance, high sensitivity input. This can be used with both passive
and active guitars and, depending on the level of output from the guitar and the VOLUME
setting, allows the amplifier to be driven hard into overdrive, if desired.
The LO/LINK socket can be used in two ways. Firstly as a lower impedance, low sensitivity
input, for use with high output guitars when the user wishes to keep the overdrive under
control. Alternatively this socket can be used as a LINK to chain together two or more
'GoldTone's, simply plug your guitar into the HI socket, take an output from the LO/LINK
socket and plug this into the input of the next amplifier in the chain.
BRIGHT
The BRIGHT switch adds more high frequencies when selected. It works in the traditional way,
therefore it has more effect at lower VOLUME settings.
VOLUME
This sets the overall volume level of the amplifier as well as having a huge effect on the tone
and the amount of overdrive. From low to about halfway, depending on the output level of the
guitar and which input socket is used, the sound should remain reasonably clean. Increasing
the control further will progressively increase the level of overdrive in the sound, obviously
being a valve amp it will respond to the player's dynamics and use of the instruments volume.
TONE
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