[Hallicrafters] HT33

[Michael Mardit]

I have been redesigning my (4)4cx300a amp to get the same output on the 
bands above 40m that I get on 160 through 40m.
Would anyone happen to
 have a schematic on the HT33 amp that uses these 4cx300a's, or would 
someone be able to tell me how the tubes are configured in this amp?
I
 have been using mine with 2400v on the plates, screens are grounded and
 metered for current, control grid is tied directly to cathode which has
 a 100 uHy choke to ground.
The drive is placed across the 100 uHy 
choke.
On 160 and 80m I get about 750 watts out with 100 watts of 
drive, but as the frequency increases, the power output falls off to 
where at 10m, I only get 200 watts out with 100 watts of drive.
The 
tank circuit and the other plate components are not at issue. I believe 
that the problem lies in the input circuit or the way my tubes are 
configured...the design is based on an old W6SAI article from his Radio 
Handbook 17th edition.
                                            
Tnx, Mike WA2VQW

Celebrating my 50th year in the hobby as WA2VQW