as-audio

Is this to point out the relevancy of you or this forum? Thanks.

Thank you for your warm acknowledgnet. Everybody who is in need for repair of this item will appreciate your contribution.

The diagram, shown in post 23, has some mistakes. I checked part PB-300, single channel output boards. - The connection from R324 and C303 to the drain of Q307 is wrong, these are on the collector. - "R311" appears two times, on Q310 drain read R307. There may be more errors that I did not see. Please note that the bord layout for Q304 and Q305 is for a japanese bipolar transistor, but they installed the JFet devices shown on the diagram which have a different pinout. The circuitry of this output amp has no stable operation and I will probably comment on it later. The host for the diagram picture is not always available. I can not upload it here again, because the file size is twice of that allowed. Available from me on request.