Yerasov GTA-15, User Manual, Page: 6 / 8

4. TROUBLESHOOTING
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5. SPECIFICATIONS
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
m otion after nun plugging the amp from the mails.
Always install a serviceable valve .
6. DELIVERY
.. .......................... Guitar Combo Amplifier GTA-15 units ..... ........................................ 1
AC fuse (spare) T0, 5A, units ....................................... . ........... ........... ........ ................ 1
Operating instructions, ........................... ......................................................................1
Container packing, items ..................................................... ......................... ...............1
Input resistance, MOhm ..................................................................... ............ 1
Output power, W, ........................................................................... ........... 15
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