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With the amplifier off and unkeyed simply take a multimeter and look for continuity between the antenna and the driver jack. If you have continuity then that means the amp should be receiving and watts should also be flowing through the other way with the amp in standby or off.

Bad Keying circuit

Id like to see a meter on the input side looking at the input tune. If the filament choke is not sufficient or up to snuff you will get a symptom as you described. The input tune will look like its varying and be unsteady. Or could be bad 50 year old tubes.

I wish all the remaining Heath kit sb220s would just die already. Everything about them is a pain in the ass. They were only fair when they were built and 40 to 50 years later they suck. Aside from phantoms and all the other sweep tube boxes still kicking around, I've never seen a less forward...

That looks pretty standard for pretty much every CB amp made

I say this all the time. Dc boxes are a race to the bottom. And tbh, toob boxes are a hard sell when you charge what its worth to build. Everyone is still on the maco 300 and phantom pricing plan. People remember $800 ameritron boxes. Those days are gone people.

They sure are. Unless youve got a direct hookup on certain things you are certain to lose money. All the internet builders that you see building amplifiers out of ICA manufacturing components, every one of those guys is losing money. If you have to pay retail for all the parts and you think...

Replace the tune and load caps. Problem solved. You have a 50 yead old amp that arced a cap or two. Consider yourself fortunate. Rf parts has them.

Word.

Rfparts, eBay, anywhere.

Yet another reason why i recommend hardline. U It is a neglige cost difference that pays enormous dividends far less loss, better connectors, squirrel proof. You could use 1/4 hardline if you wanted. To put it in comparison, belden rg213 is 1.35 a foot, i bought ldf4-50a for a whooping 1.65 a...

I was always told to be careful doing that, using a center tap transformer for a full wave rectifier in a full wave bridge and not using the center tap. I was told that sometimes the installation is not rated high enough for that across the transformer

Since everyone can just get 320a leeces now its not a thing plus guys run boost. Also contrary to popular opinion you can run more than one supply per alternator. Im also talking avg.

Shhhh dont give all the secrets away... But as far as inconvenience, i mean, its not as easy as a 2 pill but when you can see three ac alts make 80k plus its really puts power and alternator use into perspective. Just key the mic and rev a little. If each key is at a sightly different plate...

Nahhhh its fine. The biggest issue with the 6000 is the higher plate v required. The biggest benefit of the dual 3000 box is a simpler filament situation and slightly higher plate dissipation rating.

Had a 3000, now ive got a 6000. Thinking of changing to two 3000s. My daily driver is working on getting a 3 tube 3-500z

I have said the same thing about plate transformers for years, right up until last month. I had a guy with a base amp and it ran fine, made all the watts, no issues. But it stunk. Smelled like burning plastic. Now he had this since new for over a year and the trans was new. I came over, and gave...

Once you try to build a proper 32 pill mobile going ac makes alot of sense. Especially with the pills nowadays. There is loads of trapped potential in an alternator once you make it unregulated and tap the ac. If you have never run ac you just have no idea what can be done . One alt on an ac...

The problem is likely the power supply. Did you replace it yet? 75a is marginal at best for that amp. Especially biased.

Nobody wants impedance