My beautiful SX-1980

Saturday, November 19, 2011

Sherwood S-9910 recap and service

I got a Sherwood S-9910 to service and recap, this thing is a big receiver! No known problems, except that the controls need Deoxit applied to them, which I'll be doing. I'll be replacing all the caps, including the filter caps, along with all the transistors in the preamp sections. I'll also be pulling the outputs and re-greasing them along with cleaning the relays. The caps I'll be using are Nichicon PW for the power amp and power supply sections, Panasonic FC for the preamp sections, Nichicon KL for the blue and orange low noise caps and Panasonic ECQ film caps for any caps under 1uF. Here are a few specs on this receiver:

100 watts per channel into 8 ohms
4 gang tuner with a 1.7uV sensitivity
Triple tone controls and adjustable input sensitivity for the phono 2 input
Weighs 41 lbs

Here are some before pics of the boards and other stuff:

Tuner board
 
Phono preamp board


Tone control board


Tape/Mode board


Driver boards


Power transistor/relay board


Power supply board


Filter caps


Tuning capacitor

And here is after!

Tuner board


Phono amp board


Tape/Mode board


Tone amp board


Driver and power transistor/relay boards


Power supply board


New main filter caps