• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

SR-303 Restoration

xoaphexox

xoaphexox

Supernatural Anesthetist
Continuing the restoration of several Pioneer pieces. Tonight I finished the SR-303.

1. Replaced electrolytic capacitors with Elna Silmic II / Nichicon Muse FG / Panasonic FC/FM
2. Replaced mylar caps with 1% or 2% polypropylene Panasonic ECQ-P(Z)
3. Replaced fusistors
4. Replaced stock op amps with (gold socketed) Burr Brown OPA2134
5. Reflowed every solder joint
6. Stripped and cleaned chassis with ammonia free windex and Mother's chrome polish
7. Deoxited controls
8. Replaced power supply transistors with beefier ones
9. Replaced all eight 8v incandescent lights for the display
10. Calibrated the unit with the 150mV 400Hz input tone and 20,000khz internal drive unit (used my PC as the signal gen and my Tetronix scope)


I will probably keep the input hooked up for the light display but doubt I will really use the reverb effect for anything.

Next on deck: either the SPEC-1 or SPEC-4
 

Attachments

  • sr1.jpg
    sr1.jpg
    120.1 KB · Views: 54
  • sr2.jpg
    sr2.jpg
    50.1 KB · Views: 51
Register to hide this ad
Thank for sharing your work ,I have one just recap ,try to replace all new
8v incandescent lights ,but dont' know where to buy them ,and little scare to open the light housing box .
Can you please teel me where I can buy those light ,and some intruction how to change the light .Thank you very much
Don
 
I run mine the same way as a light display only. Just no need to add reverb in my room.
 
There is a white plastic bracket on each side of the lamp housing. There is a little tab at the back end that stops them from sliding backwards off the black housing. If you use a screwdriver (I used an awl) you can pop the little tabs out enough and the whole side (PCB and white plastic clip) slides right off!
 
You must log in or register to reply here.
Back
Top Bottom