National HRO 500 Communications Receiver Video #5 - And Then, A Miracle Happens

After a quick review of my solvent collection, I continue my pursuit of the trouble in this radio while learning more about its complex circuitry and operation. I start tracing a signal from the antenna through the first amplifying transistor and on to the second when the miracle happens.

[@thethirdrail8397]

The Folk-Rock group the Association… had the Lp : “And Then Along Came” on the Vailent Label : VLM - 5002(Mono) : VLS - 25002 (STEREO) : London records SHA-U-98 (Stereo-Phonic : A.K.A Electronic Stereo) WBS - 1702 I have as many copies and versions of this Lp … mono,stereo,electronic stereo. The Album includes many well known songs and a few other songs that were not on the radio or at least not on the radio much. Jim practically said it with the title of this video.

[@jrumiano]

I wonder if connecting the scope to the transistor socket physically moved the socket pin and caused the transistor to start conducting, Could the whole problem be the transistor in the sockets losing connection? Maybe worth a look top side at the actual transistor to see if moving the transistor causes the radio to stop receiving again. Nice to see it not actually dead. 👍

[@thethirdrail8397]

Some of the products you use are at least somewhat hard to find here in the USA. If the products can be found, the price is often quite high.

[@charlesrichardson4839]

WD 40 also makes a contact cleaner, here in the USA it is carried in many auto parts stores.