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I forgot to put in these RF Parts door-knob

Ceramic Disk Capacitors are used as RF bypass capacitors in RF circuitry--that is to short RF to ground. And Capacitors can be also used to block DC and low frequency current form passing through

You should not be getting any grid current reading. Alek, VK6APK.

Adrian and all I sent a similar reply a few hours ago, but it doesn't show up, I assume it's lost.? And if not I hope the 2 versions are consistent. I measured the voltage across the 2 terminals of

For a few years now, I've been using Antek toroids for my "custom" transformers: https://www.antekinc.com/? Where necessary, I've bought a suitable low-voltage unit and rewound it for my

Well friend, I'm not sure if a dollar is worth the same to you as it is to me :) Keep in mind also; Something that you can get for two hundred bucks is going to be triple that for me, once I factor in

Strange.? When I access my 8100 via a USB port, it responds to commands from a terminal program instantly.? I wonder if you've tried accessing the 8410 from a terminal program?

And if we simply ground one of the terminals of the 6.3V transformer, what happens? -- F1AMM Fran?ois

Dear '1200 Builder, When dealing with Heavy Iron it is not wise to Jury-Rig. Save for the ability to purchase the right iron. In fact, HARBACH may just have the perfect item in stock, or would be

A 6.3 VAC @3A CT transformer will work just fine. That’s what I used -Chuck K1KW Sent: Friday, December 01, 2023 5:07 PM To: ham-amplifiers@groups.io Subject: Re: [ham-amplifiers]

The clue is surely in the grid current reading. It should be zero with no drive. 73, Alek VK6APK.

Ahh that's good to hear, Thanks! Any idea on whats needed of the required transformer? I'm kind of thinking that as long as the winding can handle the DC current, and doesn't have a huge DC

Got an 80B here and I am having meter issues. The swr and power meter were not working properly and I put in a new op amp on the meter board and I also changed out the 2 2n3904's going to the op

Adrian and all I measured the voltage across what I believe to be R6 in the 1988 power supply schematic or R1 in the 1983 schematic.? It is visible in the 4th picture I sent yesterday evening (PST)

Quote: “I've also heard of using the secondary winding of a totally separate transformer that does have a CT, and using it in parallel across my filament winding, then using that transformers centre

Still another easy way out is to unwind those heavy windings and put in your own center tap. There can't be more than 20, 25 turns of wire per 6V winding?? Transformer secondaries are always wound on

Hi, I've been trying to gather parts for a 3CX1200D7 build. I had trouble locating a sufficient filament transformer. Tube requires 6.3V @ 25A. Ended up finding one for 6.3V @ 28A - Would like to have

One picture clearly shows the the CT bias resistor and the zener diode being switched by a relay (blue)mounted on the center wall. ?The PC board which looks like a relocation of the ALO board might

What I think Lou is saying is...... the cut off bias isn't being applied on RX....( cuz of lousy bias relay contacts on RX)...... hence the tubeS are sucking normal idle current.? BUT if that was the

Lou Below should be my attempt to take 6 pictures of areas that have evidence of possible mods.?? My pictures aren't great - if you see an area of interest let me know and I'll try to get a clearer