Update:
After applying feedback, the max amplification became not enough.
Originally the preamp and the splitter were in 2 separate envelopes/channel.
Now, in the 2nd topology the the preamp + splitter are moved into one envelope. Doing so, one full tube (6922) became free/per channel. And as a next step this free tube was used as extra preamp + current source, and the amplifiaction is now more than enough.
Playing with the feedback (feedback resistor value + feedback topology) the sound starts to be "acceptable" with many different music including classical music.
The BEAUTIFUL sound of the 6922 is audible.
Stefan.
After applying feedback, the max amplification became not enough.
Originally the preamp and the splitter were in 2 separate envelopes/channel.
Now, in the 2nd topology the the preamp + splitter are moved into one envelope. Doing so, one full tube (6922) became free/per channel. And as a next step this free tube was used as extra preamp + current source, and the amplifiaction is now more than enough.
Playing with the feedback (feedback resistor value + feedback topology) the sound starts to be "acceptable" with many different music including classical music.
The BEAUTIFUL sound of the 6922 is audible.
Stefan.
This projects start to live again - After many months I have decided: the current FE127E single drivers are NOT enough for my room/needs.
I am thinking into direction of using the FE207E from Fostex.
As soon as the speakers are built - new set of test will start. I hope that my "simple" PP will be able to drive these bigger speaker.
trif.
I am thinking into direction of using the FE207E from Fostex.
As soon as the speakers are built - new set of test will start. I hope that my "simple" PP will be able to drive these bigger speaker.
trif.
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