Hello,
As reported in last spring in another thread I’ve finished a 6336-SE.
I’ve attached the design of Grover Gardner, he encouraged me to do so. It has a classic power supply (no electrolitics in the last filter stage) and the heater voltage is lifted some to prevent hum.
I’ve been listening for a while now and I’m still really pleased with it. Thanks again Grover for sharing this.
Curiosity – as always - drives me to using the solvering iron to try a few options.
There are some modifications I’d like to try. Some thoughts are:
- incorporate a grid choke in the third stage. Some say it will make the 6336 really sing.
- change the second stage of the EL34 to a screen drive mode to make it more linear (inspired by an article in Sound Practices). Would this be wise/feasable?
- a constant current source (ccs) instead of a cathode resistor in the third stage. However, somewhere the datasheet that says the 6336 needs at least 100 ohm cathode resistor. How does this relate to installing a ccs?
- Replace the 6336 by a 6528. I think the 6528 will drive on a lower B+ voltage with a lot more current.
I don’t have a EE-competence to design such options. I’d like to ask members of the diyaudio-community to comment on such options. And may be one would be even willing to contribute to a development effort. With concrete suggestions for change of components/values I could experiment some and report it back.
Any thoughts?
Best regards, Arjen
As reported in last spring in another thread I’ve finished a 6336-SE.
I’ve attached the design of Grover Gardner, he encouraged me to do so. It has a classic power supply (no electrolitics in the last filter stage) and the heater voltage is lifted some to prevent hum.
I’ve been listening for a while now and I’m still really pleased with it. Thanks again Grover for sharing this.
Curiosity – as always - drives me to using the solvering iron to try a few options.
There are some modifications I’d like to try. Some thoughts are:
- incorporate a grid choke in the third stage. Some say it will make the 6336 really sing.
- change the second stage of the EL34 to a screen drive mode to make it more linear (inspired by an article in Sound Practices). Would this be wise/feasable?
- a constant current source (ccs) instead of a cathode resistor in the third stage. However, somewhere the datasheet that says the 6336 needs at least 100 ohm cathode resistor. How does this relate to installing a ccs?
- Replace the 6336 by a 6528. I think the 6528 will drive on a lower B+ voltage with a lot more current.
I don’t have a EE-competence to design such options. I’d like to ask members of the diyaudio-community to comment on such options. And may be one would be even willing to contribute to a development effort. With concrete suggestions for change of components/values I could experiment some and report it back.
Any thoughts?
Best regards, Arjen