• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

DHT fixed bias schematic

rcollege

Member
2010-12-02 5:06 pm
Hi all.

I have been playing with a pair of 1H4G tubes.
I have been trying to locate a schematic for a fixed bias DHT...or a good explanation of one- simple if possible.

With the DHT's I'm using now, I have 2V going through the filament via a separate 5vdc supply.
I am using LEDs to bring the 5V to 2V before it reaches the filament. The filament goes straight to ground.

I'm using a Class A SE circuit no feedback...basic, basic circuit.
I have good sound...but it lacks bass. I know I can get more out of them.
Detail and imaging is good...good enough to keep trying DHT's...addictive...worse than chocolate.

Any help would be appreciated.

Thanks
 
Last edited: