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Manuals are written so that maximum safety to the equipment is ensured. They don't have time to teach amplifiers 101 in the manual. That is something you learn on your own. As time goes on and you are a ham for "gold years" and beyond, you learn the finer points of operating and you expand on...

It would not hurt to do that and there is nothing wrong with doing that assuming theory and actuality is 100% the same. In reality it's not and there will be a slight difference, maybe not enough to be concerned about, but you can conduct a simple test to see what the difference may be in your...

You are getting close. It depends on what mode you will use. You would not want to load up to 80 watts (key down carrier) and then drop the power down to 50 watts and run CW. With CW your peak and average power is the same so the peak power will be 50 watts not 80 watts so you would be better...

Your last sentence should be "Everything I have seen specifically says not to tune at reduced power AND THEN DRIVE THE AMP WITH ADDITIONAL POWER. That is was you have seen.

A simple understanding of a linear amplifier is all the proof you need. If the amplifier is operated anywhere along it's linear curve, (the linear portion is basically a straight line) the amp will be linear. A linear amp becomes non linear when it is operated out of the linear region So, if...

If you only had a 50 watt radio then you would load the amp with 50 watts, you would have to because you don't have any more power. Now, just because you loaded it with 50 watts does NOT mean it is not loaded properly because you did not load it with 80 watts. The amp is properly loaded for...

The TS-440s does have a variable RF power control. But does not work on SSB.

Since the TS-440 has 100 watts drive so no need for a low drive amp required, why use an amp like this where the tubes work very hard and soften up quickly? 100 watts can easily drive a pair of 3-500's to 1500 watts and they will be very comfortable at that level on SSB and will handle way more...

That should work, compare switch legs to one of the originals but should be ok

You are welcome Sir.

https://www.ebay.com/itm/12VDC-2-Amp-Relay-Double-Pole-Double-Throw-DPDT-PC-Board-Mount/252616259477?hash=item3ad11a3795:g:Ca4AAOSwtpJcR9IE:rk:1:pf:0 https://www.ebay.com/itm/10Pc-HK19F-DC12V-SHG-Mini-Power-Relay-8Pin-Coil-DPDT-1A-125V-AC-2A-30V-DC-Adjust/264103917024?hash=item3d7dd1f5e0:rk:5:p...

Wow, 50-75 bucks a tube.

My design? I am sorry but I can't take credit for the design because the "design" has been around for many decades before I was even born. But the "design" which is acceptable through the thousands of um, ham amplifiers, is actually quite simple. The tube(s) are biased to cut off using a...

I mean isn't really dumb to switch the HV secondary of a transformer to turn on HV to a tube in transmit and even dumber if you switch the HV DC voltage. I don't know of any small ice cube type relay that is rated higher than 250v ac.

The relays in the LK-500 for switching inputs is a standard configuration of DPDT relays. Many different brands use that config. and should be no problem getting one.

It's not the tubes you need to worry about, it is the filter caps that may have open or no bleeders.

Seems like an awful lot of work for an amp that makes barely 100 watts peak power. I would think getting an FT-101 radio would be a better idea and it can drive the balls off an SB-200 or SB-220 properly prepared for CB.

The two compression variable caps and the torroid is all you should need. The lower bands use mica padders for the trimmers because a lot of capacitance is needed but on 10 meters only a small amount is needed and the padders alone should be more than enough. A .01uf would be way too much even...

I don't see where you will need a .01uf cap for the 10 meter input mod.

Where do you want to use a ,01uf in the 10 meter input?