Good to know your skill set!? Curious to know if the power switch has been bypassed or if it has failed in the ON position which is rare, IMHO.? That penetrating oil trick works well so give it a try, it is the least expensive spray.??
Open power switches sometime have an insulating tarnish on the rivets that connect the contacts to the solder lugs.? Wire brush to clean and solder the rivet to the solder contact which may help and is much easier to do then finding a replacement switch.
Modern radial electrolytic capacitors are so small that you can leave the can electrolytic in place and install the new caps near where they are needed.
If you need tubes, I can supply tested?pulls?(on a TV-7 tube tester) for a buck a tube plus postage from 71901.? I have collected more then I can ever use!
Regards,?
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Tuesday, April 16, 2024 at 12:50:41 PM CDT, Bruce KX4AZ <bruce@...> wrote:
Thanks all for the detailed replies, it is wonderful to hear from S-20R veterans that have "been there and done that".
Some more details on my skill background to help tailor your advice.? I am fully equipped with soldering tools, a VOM (1M input impedance I believe), a 200 MHz Siglent oscilloscope (also 1M impedance), and various signal generators (NanoVNA for CW waveform, TinySA Ultra for modulated waveforms like AM, FM, SSB etc), as well as an assortment of SDRs for receiving signals.
The seller advertised it would plug in and light up, so I did that step before viewing the "innards" condition.? Mechanically I am fine with basic clipping/soldering on wires, but do fall rather flat when it comes to building (cutting metal openings, mounting with nuts/bolts).? But it seems like cap replacement is within my skill set, and I should able to check all the tube filaments with the VOM too.
Jim Whartenby