Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

My Latest Project a Graymark 512
#1

When we moved to Texas I found this transistor radio in the bottom of a drawer hidden away for years.

A little history of the radio. If I recall correctly, I built this radio in A&P school in Pittsburgh PA. around the Summer of 1972. I believe it was a required project for the electronics course. As time goes by it was put away and forgotten.

Well lately I’ve been interested in restoring old tube radios now that I’m retired. I’m building a control line stunter and I have a little time between coats of paint. I remembered the radio and I opened it up and put in fresh batteries. Turned it on all I heard was static. Then I looked for the electrolytic caps which usually go bad after awhile. I ordered some new ones from Digi-Key and installed the 5 caps tonight. Turned it on and it plays, very loudly too!

I then cleaned it up using Scrubbing bubbles and took some pictures. It is so cool to hear that thing playing again after what 40 years!

[Image: http://i1060.photobucket.com/albums/t458...9abng7.jpg]

[Image: http://i1060.photobucket.com/albums/t458...jyabnq.jpg]

[Image: http://i1060.photobucket.com/albums/t458...dq2eu0.jpg]

[Image: http://i1060.photobucket.com/albums/t458...chtxov.jpg]

Crist


Messages In This Thread
My Latest Project a Graymark 512 - by Crist Rigotti - 04-15-2015, 11:26 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently no members online.

>