Quality speakers. Like ADS. Heard some about a week ago. Very good tweeter. They used polyester film capacitors in the crossovers so they don't drift. Tweeters are fused so if one isn't working good chance it is just the fuse. 103 has good bass. Would love to find a pair and redo the crossovers...
Crossover today with new inductors, metallized teflon bypass caps and mills wirewound resistors. The inductor upgrade was remarkable. My 75WPC Allens can drive the big B&W's with serious authority. :beerchug:
Google translation of Japanese web page:
"What is required of speakers but that the piston-like motion, vibration plate vibrates exactly signal as the entire band that was responsible to the one you raised. It is a flat diaphragm is SONY has had arrived to pursue this.
The APM speakers...
1984
APM-22ES
Accurate Pistonic Motion. Square woofer and film tweeter. After a recap mine sound VERY good, especially with a Magnavox tube amp. Rubber surround so no rot like the bigger APM versions.
http://www.thevintageknob.org/sony-APM-22ES.html
That's R112 and R212. They are in the left and right feedback circuits. Increasing the the resistance will decrease feedback which will increase gain. It will also increase distortion some, more as you approach full power output.
Easy swap. Try higher resistance and see if you like it.
Lovely work.
Replace the computer, polyester caps. Dayton or equivalent metalized polypropylene. The stock caps are certainly still in spec but modern manufactured ones are worth the investment. My 710's improved nicely with the Daytons.
Thanks, CD.
Once I saw how my friend got lost in the music at Grainger's, I knew I had to put together something he could enjoy at home. He has a neighbor that has listened to vinyl for many years and that neighbor came over and said he had never heard vinyl sound so real. :rockon:
I think the chassis beside the main one is a phono preamp. The tuner circuitry should all be attached to the tuner frame (directly under the knobs and tuner scale.)
Edit: On closer inspection I see tuning caps. Think it is part of the tuner and might have the phono eq circuit in it as well.