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Thanks for having the original scan of the Robyn SB-520D, this is my enhanced service manual. I also included a spliced and separate redrawn schematic.

First, those look repairable, but if you want new, try the following link. They’re typical RF chokes for the DC power line. https://www.ebay.com/itm/172874371507?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5336136228&customid=&toolid=10001&mkevt=1

Besides replacing all the electrolytic capacitors, two revisions were done on this radio. A heat sink was added to the audio chip, and my usual Din to 4 pin mic jack conversion. Initially the audio IC (uPC1224H) was fried. Fortunately I found another one in my audio IC bin. I believe it was...

Further study with respect to turning the news over to the entertainment industry, plus the elimination of the Fairness Doctrine is needed IMO.

How a person voted was a private issue when I was growing up. As it should be IMO. Disguised as a class discussion, I remember a few teachers in my elementary school asking us kids who we were voting for. They fully knew that kids at an early age mimic their parents. Living primarily in a...

Note: A “partial restoration” may only last temporarily and inflict further damage, unless you first replace all the electrolytic caps. Microphone selection will mainly depend on your voice characteristics. With most base stations during that time period, lollipop D104 mics were generally a...

RIP Mitzi Gaynor Selections from Rodgers & Hammerstein's South Pacific (1958)

My enhanced service manual, including a separate redrawn schematic for the beloved SX-101 classic. Look at that face on page 1. She’s got the look….

The SX-401 utilizes the Motorola M6040A PLL, same chip as my favorite O2A PLL. I didn’t realize that until after I examined the schematic. If I run across a decent example in the future, I’ll possibly convert one to 10 meters or low channels. As such, I did a mild enhancement of the service...

The only info I found was that the Pirate was a mobile 23Ch PLL AM radio. Other Pearce Simpson radios that fit that broad description are the following. Bobcat 23C, Cougar 23B, Puma 23, Puma23B, and the Tiger 23C Inside and outside photos may tell me more, particularly the PLL number. Pearce...

I just put together the schematic of that Allied A-2530. Note: It looks like they came with Ch 11 Crystals. I think standard walkie talkie crystals will work on the other channels for transmit, but the receive crystal takes a 6 Mhz down from the fundamental. Example: 21.185MHz = Ch19. Unless...

A little time was spent enhancing the service manual along with a separate redrawn schematic. This model was one of the most popular CB’s during its day, especially among first time buyers. Radio Shack flooded the market with them. CB dealers were popping up everywhere during that period, but...

Lately I’ve been reliving my memories of Northern Exposure on Prime Video. It will take awhile to get their theme song out of my head, but it's all good....

We sold a number of those antennas, wrap around beer labels and all...

This is my enhanced Teaberry T Command service manual. I also included the usual separate spliced together schematic. This schematic is not a redraw like I sometimes like to do with radios that I own, but nevertheless, it should be easy to follow on the big screen.

I suggest Celine Dion singing "Hymne A L'Amour" at the base of the Eiffel Tower following the cauldron lighting, but youtube didn’t allow linkage. If you haven't seen this spectacular performance already, view it on youtube or other sources directly.

There was a time when I was burning mini CD-R disks. I wanted to try something different, but my interest didn’t last long. I must say they were more convenient to ship. I remember that I always had to make sure the mini was removed before a full sized disk was placed in the tray. Otherwise...

I did a redraw of the Robyn T-123B. I also corrected several tube pin-out errors. Hopefully I didn’t create any errors of my own in the process. The “Green bird” once saturated the market in our area, viewed especially as an alternative for those that couldn’t afford a Tram or Browning. Usually...

The 77-830 is my pick, only because love the old Cybernet circuit boards. The 510XL does have better transmit audio, because they use a different type of mic (Electret condenser) that has a wider audio range. The more common dynamic mics used on many other radios will not work. I do a number...

I know it’s aggravating, but Sam’s (except for some of the early radios) negated to list the resistors in their parts pages. It has become a two step process. Download the CB-243 Cobra 87gtl pdf file that Shummy posted. The resistors in question will be either on page 14 or 15. Study the...