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Buttermilk biscuits, ya I remember The Big man just dropped this hammer on the northwest tip And I'm reading the mail 4-10 4-10 I been waiting to key this duck pluckin Johnson. Put it on you later, I got to go to the mine The Man in the cold lakes with this big Johnson is 10-7 73 Jeff

The parts come in a kit from RF Parts, NFB2 is for a two transistor amp, I don't know the current cost. Keep the leads as short as possible. Adding negative feedback will help with this but it's no substitute for a properly biased amp. 73 Jeff

SRF 3749 are Motorola MRF transistors that have been tested and matched for high gain. Then they would remark them for RF Parts as Select RF parts, hence the SRF prefix. The answer is yes, they were good and no longer available. 73 Jeff

They were biased hard as built I think @bob85 quoted almost 10 times the required bias current as built. Making for a clean signal, the trade off is more heat and more current draw. 73 Jeff

Yes, they were biased when built, however many units were modified to reduce the bias current in the wild. 73 Jeff

There really isn't a "fix", the 15 meter band was really not a feature of the Pro, it's a extra, or as Pez says a gift band. It's kinda stretching the limits of the hardware in the radio moving that far out of band. 73 Jeff

Welcome to the forum. I assume you are talking about SSB The reason that some users report that your signal is "crunchy" is in part caused by a amp with no bias. Many of these little amps were built like that, just a fact of economics. The variable resistor you are referring to is actually a...

Check this out, I watch Mr Carlson on YouTube and this was in my feed yesterday. Shows how unstable the wrong cap can be in the wrong place. 73 Jeff

Nice, old school Messanger. 73 Jeff

It's a common practice for removing money from the radio owners wallets........ 73 Jeff

I looked through my books last night, I thought I had a Lou Franklin service manual that had the radio in it. No luck. I will keep looking 73 Jeff

Copy I will look more when I get home. 73 Jeff

Try here https://www.eserviceinfo.com/downloadsm/242900/ranger_RCI-6900%20F25.html I am on my phone so I can't extract the file but I think this is the service manual. 73 Jeff

I "think?" The Connex 4800 DXL is the same board. I think, it's been a long time since I had that radio, it's was the f 25. Let me dig around..... 73 Jeff

Paul is the real deal. 73 Jeff

A short time after he posted, he edited the post to remove his images...... With the reason that "No one is interested" I had responded with Have a little patience. I think new users are under the impression that the forum is manned 24/7 for radio technical support and many users here also...

It's not that no one is interested, it may take a little while to get a reply, not all members are here 24/7. Patience is a virtue 73 Jeff

Thread Closed. 73 Jeff

Same here, they offered me a "sample" for $100 but said that the NRC was still not functioning. Did they ever get back to you on the AM issue? 73 Jeff

The 10K ( both the interceptor and colossal) are very robust builds, the advantages are high power handling and resistance to bad weather, you can't change physics and a 5/8 is a 5/8 wavelength antenna. The Maco will work very close to both of these antennas, however it's not going to stand up...