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Open to reasonable offers on these.

I have a brand new matched set of 4 Toshiba 2879A Red Dot transistors. They were purchased from RFParts in September of 2018 and they are still in the bags they were shipped in. Asking $400 or best offer.

I'm local to SWPA along I-70. I think that's why I've crossed paths with their radios quite a few times. They are friendly to deal with, I can agree with that. I have no issues going there for installation accessories if I need them right away. You're probably right about why they're usually...

I bought a Connex 4400 Turbo from there a few years back. I specifically asked JR for one that was either untouched in a sealed box (they didn't have one) or only had the frequency conversion done. I was clear that I didn't want one that had any mods or adjustments done to it as I was buying it...

I ran into this strangeness before and if I remember correctly, the issue was due to the available datasheet. The only datasheets that I could find for the 6130 were for the surface mount version of the IC, while the ones used in the export radios that I have are through-hole packages and use...

I wouldn't worry about the 4 ohm impedance of this speaker when being used with a CB or export radio. Many of these radios that use a 5-pin TO-220 package audio power amp IC, are using a TDA2003 or a Chinese clone of it. The TDA2003 datasheet recommends a load between 2 and 4 ohms. With a 4 ohm...

Sure thing. Glad to hear you're back up and running.

I've attached 2 images of the pad and trace layout of those parts and the surrounding components. The first image shows how the original part was connected as well as how the sideways part was connected. The second image shows how it could be done using 2 discrete diodes, such as two 1N4148's...

The datasheet that I was able to find showed the MA28W as a Varistor Diode with a forward voltage drop of around 1.2V (multiple part suffixes to denote different forward voltage, but all were around that area) and had a predictable voltage vs. temperature curve. Seems they were meant for...

My apologies, I was wrong with my initial response. The transistor beside it is Q50, the part that is missing in the photo is actually a diode. It is D66 only 2 of the 3 pads are used in the circuit. It still should be soldered flat, I would think. I don't see any reason it would need to be...

That appears to be Q50 that is missing. That is part of the voltage regulation circuit for the 8-Volt rail.

Weird. I was figuring that was a newer board. I have a few from 2013 through 2017 and they all have the standard old style looking board. Very strange.

What's the date of manufacture sticker on the back of that's 29 say? It looks like they tidied up the PCB layout and respun it. Looks much neater inside than the normal design I'm used to looking at.

I've had good luck with link coupled, parallel resonant matching circuits, for single band EFHW antennas. I followed the design laid out on this person's website for designing the match box. http://www.aa5tb.com On the left side of the page there are a few links that cover EFHW antennas. I...

Oddly enough, on my Ranger's PA board, each output transformer only has the 2 series ferrites between the transformer's center tap and the main DC bus traces. There are some 100n caps to ground directly on the bus side of the ferrites, but I'm sure it's not ideal. Also, the ferrites in my Ranger...

That post and the comments under it. Good lord. My brain hurts now. :sleep:

There appears to be small SMD inductors beside each output transformer. I can't tell from the image if they are feeding power to the transformers or if they are for some other purpose. If they are, they seem a bit small for the job, I would think. On the other hand, Ranger uses 2 of those small...

I downloaded this app to try it out and it's pretty awesome for listening. Despite me being a younger guy (34) that has always been into computers and technology, I never knew about this remote listening stuff. I played around for about two hours this morning listening to some AM broadcast...

The input transformer center tap appears to be connected to ground through that red air core inductor. If that's the case it's unbiased and would operate in Class-C.

Mini-Circuits makes a minimum loss input pad that will convert the 75R input of your spectrum analyzer to 50R with a 5.7db loss across DC-2GHz I believe. It's the BMP-5075R+. Here is a link to a place that has them. https://signalhound.com/products/bmp-5075r/ I found them from a YouTube video by...