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BOSE 901 EQ Restoration

Old thread, but just wanted to add I used as inspiration and instruction for a rebuild. I used radial instead of axial caps (Nichicon UPM for C71-73, Nichicon Muse UES bipolar for C2/42, C10/50, C12/52, and Elna SILMIC II for C11/51) since I had some on hand, and Wimas for the for the film replacements. Only one I feel questionable about using was an oversized Wima 4.7 in C13/53.

I didn’t do the resistors, just the capacitors and transistors/diodes.

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Chucktango said:
Old thread, but just wanted to add I used as inspiration and instruction for a rebuild. I used radial instead of axial caps (Nichicon UPM for C71-73, Nichicon Muse UES bipolar for C2/42, C10/50, C12/52, and Elna SILMIC II for C11/51) since I had some on hand, and Wimas for the for the film replacements. Only one I feel questionable about using was an oversized Wima 4.7 in C13/53.

I didn’t do the resistors, just the capacitors and transistors/diodes.

View attachment 3555671View attachment 3555672
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Welcome to AK!! Nice, and I'm positive you had an improvement in sound!
 
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