Best SE KT66 schematic?

[Junk Audio]

I have a pair of 3.5k SE ultra linear Edcor output transformers that I would like to build a SE KT66 amplifier with. Does anybody have an idea what circuit would be best for this project?

 

[Ketje]

You could try something like this
Never build it,just an idea 🙂
Mona

 

[kevinkr]

I'd probably go for a single 5842 as driver using either a CCS with led cathode bias or a 100H choke load with led bias (you may need to select 5842 or trim plate voltage to get plate current in a reasonable range) and cap couple to the grid of your KT66. I like fixed bias (not cathode bias) on the output stage..

 

[rmyauck]

Check out EE George Anderson's ( tubelab.com) popular PCB's for SE & SET, and you could always do the Simple SE in P2P, but the boards are very affordable. He also has a form here.

http://tubelab.com/

 

[Junk Audio]

If I wanted to use Mikael abdellah's design shown here. I could use the 3.5k transformer and just change bias resistor for kt66 tubes right?

DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier

 

[Junk Audio]

but could I drop kt88 tubes in also if my transformer is 3.5k?

 

[Junk Audio]

By the way, thank you for that print Ketje...

 

[Ketje]

If I wanted to use Mikael abdellah's design shown here. I could use the 3.5k transformer and just change bias resistor for kt66 tubes right?

DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier

The cathode resistor determens the tube current.Mikael use 560 ohm giving 70mA,I proposed 330 ohm for 90mA giving a little bit more power.
The big question is how much current is allowed for your OPT.
Mona