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4. TROUBLESHOOTING
In some cases, you may encounter problems such as noisy valves, howling
and internal valve faults. All valves have a finite lifespan. If problems occur
it may be easily rectified by replacing a valve. A faulty valve may be
identified by knocking the valve body which may exhibit extra noise. But be
aware that some noise when knocking a preamp valve can be a natural
phenomenon. When a pre amp valve (12AX7) fails it should result in
continuous microphonics.
The simplest solution is to replace a faulty valve with a known good one.
Sometimes it is enough just to change valve places.
The faulty valve may be removed when cold by using a gentle circular
motion after nun plugging the amp from the mails.
Always install a serviceable valve.
5. SPECIFICATIONS
Input resistance, MOhm .................................................................................1
Output power, W,
Powered by a 50 Hz, in ......................................................................220 ± 22
Power consumption, W, not more .................................................................50
Weight (net), kg, not more ............................................................................12
Lamp ................................................................2xEL84, 2x12AX7 (2xECC83)
Speakers: (GTA-15C) ................................................... Celestion G10Vintage
(GTA-15E) ..................................................................Eminence Legend 102A
(GTA-15J) ...................................................................................Jensen C10Q
(GTA-15J12) ................................................................................Jensen C12R
6. DELIVERY
Guitar Combo Amplifier GTA-15 units ..... ........................................
AC fuse (spare) T0, 5A, units ......................................................................................1
Operating instructions, .................................................................................................1
Container packing, items .............................................................................................1
4
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