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This is the clearest schematic I have of the PC-409. Should be about the same as the base (ac) version. I wish it was better, but given a substandard scan, there’s only so much enhancement that can be accomplish. At least most parts are readable. If anyone else has a better copy, please post.

An enhanced version of the assembly manual (better than Bama) plus another PDF of improvements of that classic rig. Hope these help....

Does the 2510 have some unusual sized caps? Yes, but it’s not a necessity to replace them with exactly the same size dimensions. Doc never thought so, and neither do I. The 2510 has a number of very small caps. Depending on the circuit, Doc replaced many with larger sized ones that had a...

This is all I do...If necessary I carefully bend to size with a needlenose.

Broadbanded circuit…check No relay bypass circuit…check That leaves me with the conclusion that this was made to accompaniment a SWL listeners receiver, particularly those old school receivers that lacked sensitivity above 20 Mhz.

A word of caution that’s not mentioned about those octal plugs, always make sure the power cord is unplugged from the wall socket first before attaching the octal plug. IMO the key post on male side should have been made a little longer to avoid any pins from making contact incorrectly before...

I’ll go back to monitoring 19 whenever the skip is gone. For now 16 LSB is where it’s at.

I use an O-Ring on my Retevis RT-5. Unlike the locking methods the ring provides just enough friction to keep the knob from creeping, yet it will still maintain full function.

I'm in..."sunbulls 300" LSB...on my bearfoot rat-shack...

Scanning several local VHF and UHF repeaters, FRS Ch1, Ch19, plus the continuous Monday hype about the Buffalo Bills win. Go Bills!!...

Maybe it’s just conditions, but from my end in western NY, he doesn’t seem to have the same consistently strong signal day after day. His audio quality is still good, but has also degraded slightly. He was absent the airwaves for several months. The CB'ers at out gravel pit during that time...

I’m occasionally asked,” why do you keep maintaining all those old radios when you can move on to something new”? For me the answer is simple. “They need me”.

Just another way to provide some additional heat sink. I cut the tops and bottoms off two appropriately sized tin cans that would tightly sandwich all the resistors between them. By first laying all the resistors out like spokes on a wheel, a mark was made on the cans where each resistor lead...

Yep, those screws are small and easily lost. Use caution when you tighten them. A snug fit is all that's necessary, otherwise you will strip out the plastic.

If the larger gauge doesn’t fit I break out my Dremel. I try to be consistent throughout with the larger than normal gauge wire that usually comes with an automotive spade fuse dongle, so modifying some of my used plugs is the only option. Saving all my used plugs has paid off, but I still...

After looking at the photo close-up I spotted at least 3 other core tops that are cracked. That typically happens when too much force is used or from an improper sized tool.

Poison Control Assistance Center https://www.poison.org/articles/capsaicin-when-the-chili-is-too-hot o_O:LOL:

Frank's Hot sauce. Great flavor without the after burn. I like the taste of everything from mild to medium Buffalo wings. Anything commanding an immediate drink afterwards is not for me.

I haven’t had one on the bench yet, but the Radioddity CB-27 Pro with FM looks like it came from the same mold as the Cobra 19 MINI. Instead of the menu they replaced it with buttons. I like that improvement. For comparison I attached the manuals for both radios.