as-audio
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Repair and restoration of my STAX SRA-12S
as-audio replied to Quad's topic in Headphone Amplification
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Repair and restoration of my STAX SRA-12S
as-audio replied to Quad's topic in Headphone Amplification
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Repair and restoration of my STAX SRA-12S
as-audio replied to Quad's topic in Headphone Amplification
Is this to point out the relevancy of you or this forum? Thanks. -
Repair and restoration of my STAX SRA-12S
as-audio replied to Quad's topic in Headphone Amplification
Thank you for your warm acknowledgnet. Everybody who is in need for repair of this item will appreciate your contribution. -
Repair and restoration of my STAX SRA-12S
as-audio replied to Quad's topic in Headphone Amplification
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.