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across the bench [season-2] the electron strikes back
- Thread starter sae-7125
- Start date
sae-7125
Super Member
just the basics on the rear panel
Optonica - Wikipedia
interior isnt too much of a mess
Enjoying this interesting and informative thread!
sae-7125
Super Member
nice labeling of components, mains txf size would suggest healthy output wattage
optonica rh-ix1066af darlington output modules
What amplifiers used Sanken S-60w or ECG1354?
Hi all, I've been trying to repair my Optonica SM-3205, which has one bad power IC. It uses the RH-IX1066AF circuit, otherwise known as the ECG 1354 or the Sanken S-60w. Since it's near impossible to find deadstock units, I've been trying to figure out what other amps used these ICs. So far...
sae-7125
Super Member
not too many caps although accessing bottom of the board might be a problem
looks like sm-1515H is of similar cosmetics and circuit design.
sae-7125
Super Member
the sansui mentioned in previous posts
sansui au-d55x integrated amp, display looks nicer when power is active.
more than a few design issues inside. this was earmarked for the scrap pile but instead became a deep dive into why these arent worth dumping money into especially if a quick turn-around profit is the main goal. for a hobbyist or electro-mechanical enthusiast something like this can be a fun test bed for modz. similar to finding a '90s sedan and adding a turbo just for kicks.
for those familiar with cleetus mcfarland on youtube, plus who knows how many other similar channels, modding for the fun of it is the general theme.
youtube.com/@CleetusM/videos
or some design analysis over at i_do_cars:
youtube.com/@I_Do_Cars/videos
the heat pipe design in this sansui has potential. couple bottles of quantum nitrous above the exhaust manifold, what could possibly go wrong...
sae-7125
Super Member
removed the face plate, phono plastic button was trying to escape. other things to access include tone control (on/off) button removal which involves desoldering it. lots of spray and a decades worth of mechanical exercise needed (tip of the iceberg).
usual age/use related fracture of a plastic component. pinch back into shape and then install thin metal wire around the square plus a small blob of solder to complete the ensemble.
sae-7125
Super Member
the wiggle test revealed some broken solder joints, most likely an extreme hot spot as well
what are the chances this transistor hits 185f/85c or higher
Sansui AU-D 55 X | hifi-wiki.com
sae-7125
Super Member
installed some new pots, multi-turn for offset and single turn for bias (each channel). offset is still very sensitive when adjusting even with multi-turn. one power resistor upgrade shown, higher wattage and up off the board. another power resistor upgrade will be needed since this is one of many inferno/fireplace locations in the chassis. daughter board from previous post not reinstalled yet.
rectifier board removed to do some recap activity. power caps will remain for a while longer until the update photos are posted.
