12-23-2016, 09:09 PM
I bought this receiver a few (or was it several?) months back. I'll post a picture of the outside later. If you want to see what one looks like for now, you can Google the term "Realistic STA-225".
This one is working, but the electrolytics are old and someone replaced two of the audio output transistors at some point, so the sound is less than ideal.
I am going to replace all four audio output transistors, along with the two large power supply electrolytics and all of the other electrolytics in the power supply circuit. I will then see how it sounds and go from there.
Here's a look at the areas I will be concentrating on.
[Image: http://www.philcoradio.com/images/phorum/STA225_001.jpg]
These two electrolytics to the left of the power transformer will be replaced.
[Image: http://www.philcoradio.com/images/phorum/STA225_002.jpg]
Under all of those wires is the power supply board, which is held onto the main chassis with two screws. It may be a bit of a challenge to get to these caps.
And, guess what...no schematic! So this will just be a matter of replacing specific parts. I hope.
This one is working, but the electrolytics are old and someone replaced two of the audio output transistors at some point, so the sound is less than ideal.
I am going to replace all four audio output transistors, along with the two large power supply electrolytics and all of the other electrolytics in the power supply circuit. I will then see how it sounds and go from there.
Here's a look at the areas I will be concentrating on.
[Image: http://www.philcoradio.com/images/phorum/STA225_001.jpg]
These two electrolytics to the left of the power transformer will be replaced.
[Image: http://www.philcoradio.com/images/phorum/STA225_002.jpg]
Under all of those wires is the power supply board, which is held onto the main chassis with two screws. It may be a bit of a challenge to get to these caps.
And, guess what...no schematic! So this will just be a matter of replacing specific parts. I hope.
--
Ron Ramirez
Ferdinand IN
