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RE: Here is the thing: Avoid gilding a dandelion.

Posted by Tubenstein on March 13, 2017 at 08:38:38:

I agree with you most part, however, this is necessary to have a fully balanced linestage like the SFL-2. I listened to a system that has Lynn Olson Amity abd the SFL-2 drive it perfectly as this amplifier is pretty insensitive -- around 5v input sensitivity with 300B output tubes.

The SFL-2 has a pretty high gain and well designed balanced circuit. I don't think a preamp with your listed DHT tube is able to do the job. Unless a DHT preamp build in the way like this circuit with PT8/PT9 WOT that has 24db with tremendous amount of drive, but it has 2 stages.

Unfortunately, I have the circuit, but no values of all components indicated in the circuit.