| This amp has an all-valve output stage with switchable output power. Either 2, 4 or 6 of the 6550 valves can be selected, allowing flexibility on stage or in the studio.
There is a choice of preamps. The Valve preamp has no EQ and a single level control for pure valve tone. There is also a GP-11 semi-conductor preamp offering 11-band EQ among its tone-shaping facilities.
Output Valves
6 x 6550A Beam Pentodes.
Pre-amp Valves: 3 x ECC83 (12AX7) Double Triodes.
Valve Preamp
Input Impedence: 4.7 megaohms.
Input Sensitivity: 30 mV (for full output).
Power section
Warm-up delay: 30 seconds.
Output protection: Open Circuit output protected.
Cooling: Controlled airflow cooling (its got a fan!).
Output Impedence: 2 or 4 ohms switchable.
Output Power:
Low: 80 watts RMS.
Medium: 250 watts RMS.
High: In excess of 350 watts RMS.
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