304TH/304TL in grounded Grid

[WA1GFZ]

These old tubes are not suited for HF without understanding how to tame them.
A 4-1000A will be a lot easier to get running stable because it is an RF tube a generation or two newer. These old tubes work great as modulators and still fun to watch.
But go for it if you want. Heck I had IRF250s on 75 back when they cost almost $80 and blew them up.

[WD5JKO]

And finally dont believe anything JI claims without checking other sources with more credibility and actual engineering credentials.

I apply the same discipline to any post from CA.

Jim
WD5JKO

CA is not a place

[KX5JT]

I love this thread.... keep the ideas flowing.  Even though many people thwart the idea of brining a 100 watt carrier rig up to legal limit, saying it is not worth it.... heck... why not!?  100 w vs. legal limit can be a game-changer on 80 and 160.

I am intrigued by the idea of using the Viking to drive a larger class C amp/modulator combo as shown in the manual, but have seen VERY LITTLE evidence of that being done much.  Well probably because you still need the mod iron and all, but nevertheless it looks like it WAS an idea that was valid in the past.

[W7TFO]

My concerns have been abated.


73DG

[W2VW]

I love this thread.... keep the ideas flowing.  Even though many people thwart the idea of brining a 100 watt carrier rig up to legal limit, saying it is not worth it.... heck... why not!?  100 w vs. legal limit can be a game-changer on 80 and 160.

I am intrigued by the idea of using the Viking to drive a larger class C amp/modulator combo as shown in the manual, but have seen VERY LITTLE evidence of that being done much.  Well probably because you still need the mod iron and all, but nevertheless it looks like it WAS an idea that was valid in the past.

Bringing a typical 100 watt rig up to legal limit should include cleaning up the fur.

Most GG legal limit amps need 20 - 30 watts carrier drive plus a way to tune up at 100 watts carrier drive.

A Valiant is about the worst thing anyone would want to amplify.

People should consider making a quality 1500 watt signal instead of fixating on amplifying existing carrier output of a tx with issues.   

[W4AAB]

Clark, I have a 450TL of unknown condition that I would like to do something with as far as making an amp with. Looking for schematics. I DO have a 4-1000 and am looking for a BIG chassis. There is an article in FEbruary(?) 1960 CQ of a 4X1 amp.
                                 Joe W4AAB

[ke7trp]

This thread really went downhill.  I guess we have alot of SSB amplifier builders here.

John, I think a roll around amp that can take the drive from a Viker, DX100, Valiant, globe champ ect, would be very cool.  I guess others want to tickle Grids with some big massive power attenuator glowing and burning the carpet on the floor if the shack.

Joe,  I cant seem to find any 450 TL amp schematics. I know there are some out there somewhere.  The tube is a beast.  A single will run 1250 watts KEY DOWN in AM service.  LOL.  That must be a sight. 

If I run into anything I will forward on to you.

C

[Bill, KD0HG]

Here's the official Eimac 304 TL data sheet. I also have the 304TH sheets, if anybody wants them.

Consider the design possibilities.

[Bill, KD0HG]

Here's the late-1940s Bill Orr article.
.
LOL, that was when NYC Radio Row on Cortlandt St. (WTC now?) and the Chicago South Side surplus places like BC Electronics were selling 304s for $4.95..That was a few hours of work at $1.05/hr....

Bill

[ke7trp]

That seems like one hell of a cool amp to sit on the table near a classic 50s Transmitter,  On the floor would be the power supply and a foot switch

[KM1H]

12th Edition from 1949

The 14th has a 4-1000A amp and 304TL modulator

The 15th is the one that had the ARRL staining their undies, PP 4-1000A's!

Carl

[DMOD]

Clark, if you still want to design with a 4-1000A check your PM.

Phil - AC0OB

[Opcom]

...
Any linear amplifier project planning comes down to what kind of power supply one can build.
...

Wiser words have seldom been spoken.

[W9GT]

The old saying is: "Run what ya brung"  or when referring to home brewing..."Use what ya got" (to build it).  Certainly, all home brew projects aren't perfect designs, but they utilize what parts are on hand, or that can be obtained reasonably.

As for 304TLs...what great modulators they make!   I'm working on a pair of 6C21s in PP modulated by a pair of 304TLs.  That ought to produce a little smoke...one way or another.  I've been collecting parts for 30 years.  Still would like to find another plate transformer out of a BC transmitter, but already have the mod iron and mod reactor.

The only way this rig will be "green" is if I paint it green.   

73,  Jack, W9GT