Beyond the list of standard restoration steps detailed on the main page, here are some added notes for this unit :

I acquired this receiver from Goodwill, so no background on any issues, etc.  Exterior condition was very good.  I am attracted to unusual projects to keep things interesting and this certainly met that criteria.  As they say “rare does not always mean good”, but it in this case it does.

The Toshiba SA-20Y is a highly regarded late 60s cap-coupled receiver with the excellent build quality that was table stakes across most brands at that time.  It has unusual features like a rear switchable Aux input level as well as the ability to customize the “line level” tape in to monitor just left or right channel as well as both (stereo).  There is also protection relay that cuts power to the amplifier if over current is detected (I cleaned those contacts as direct replacements are unavailable).

The Main speakers use nice knurled screw terminals while the “ext” speakers require a set of special 2-prong plugs.  Given that, this receiver would be best for applications using one set of speakers.

The restoration started (as usual) with visual inspections and safety checks.  Issues noted:

1. The power cord was badly mangled, so a new cord and strain relief were installed. 
2. The heavy wood cabinet had lots of scratches which I corrected by carefully sanding down to the veneer and then applying new finish. 
3. The AM bar antenna had a broken bracket, so a replacement was obtained/installed. 
4. Finally, the trimmer pots were “open frame” and looked quite corroded.  I normally use fader lube to revive the original pots.  In this case I decided these were too far gone and installed all new pots.

Power-up testing showed good functionality using the Aux path, but the FM tuner sounded very weak.  This was traced to degraded caps in the MPX output section which when replaced brought the FM tuner to life.  After completing the tuner recap and alignment, the FM stereo performance is quite good.  The signal meter does read a bit high or “hot”, but there is no adjustment for that, and not a big deal IMHO.

I always test the output transistors while replacing the mica and thermal grease.  I found 2 of the original devices were starting to leak, so installed 4 new matching output transistors for balanced channel behavior.

The recap was otherwise uneventful. I up-capped the main amplifier supply cap (from 2200uF to 3300uF) and ~ doubled the output caps (from 1000uF to 3300uF) to improve bass response.

Cap-coupled amplifiers do not have speaker isolation/protection relays so there is often some harmless heard during power up and/or power down.  For the SA-20Y, I noted on power-up that the is a “pop” when initially selecting the ext/phones speaker setting.  Power down is well behaved if you use the speaker/power knob to turn it off.  This disconnects the speakers just before power is cut.

Cosmetics are very good with the refinished cabinet.  There are still some chips out of the veneer along the bottom on the right side.  The faceplate and knobs are in excellent condition.