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Hello, Now suddenly the VU indicators stopped walking and that I retouch all the welds.

Today I made tests to the power stage always with a 70 watt incandescent lamp in each feed rail, by injecting a sine wave of 1 kHz and load fantsma the amplify the wave came out clean, good achievement but the bias of the left channel was nails in 230mV are about 35mA but I can not lower the...

What measurement would be taken in that case? Resting current?

Thank you for all the comments, it was very helpful, BIAS transistor was not the one that had to work well, it was an inadequate replacement, now it seems to work well, the original equipment has 2N3403 in one channel had BC337 and the other BC546B which is the correto of his replacement.

the insulators of the power transistors are new, I use a lamp of 70watt in each rail but they do not turn on it means that everything is ok, but the rest current is high and I have no more adjustment.

check the welds and they are all perfect

DC Offset I have 0v

I was taking measures in resistance of 10 ohms which is in the positive branch because there are 2 resistances of 10 ohms and another in negative branch, The reading was 240mv and the preset has no more minimum, Will any resistance be devalued? or you have to change the drivers.

El amplificador vino con las dos salidas quemadas, no todos los transistores de potencia solo 1 de cada canal, siempre con la lámpara en los rieles de alimentación. Como funcionó bien, procedí a sacar las lámparas y puse el fusible correcto, luego explotó nuevamente. cosa rara, pero un canal...

Hola, estos tipos de amplificadores en general causan muchos problemas y, cuando se trata de repararlos aún más, tengo el canal izquierdo que no puedo ajustar la corriente de inactividad y ya sustituyo varios transistores, incluido el Bias. Algunos conocedores de esta marca podrían darme más...