I would suggest building the EAR859 amplifier.
Tim, I spent some time searching for the schematic on the internet. All I could find was a fuzzy “psuedo schematic” without power supply voltages and transformer details. Do you have a clean schematic to post here, please?
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Hi Francois,
It took me only a moment to find the schematic on this forum.
https://www.diyaudio.com/forums/tubes-valves/27132-ear-859-questions-2.html#post316531
https://www.diyaudio.com/forums/tub...transformer-300b-shootout-12.html#post4289564
The B+ is shown (500V) and if you search you'll find where TdeP says the OPT impedance is 4.8K.
There are photos of the commercial amp innards to give you ideas for the layout.
It is a very stable reliable design.
best
tim
It took me only a moment to find the schematic on this forum.
https://www.diyaudio.com/forums/tubes-valves/27132-ear-859-questions-2.html#post316531
https://www.diyaudio.com/forums/tub...transformer-300b-shootout-12.html#post4289564
The B+ is shown (500V) and if you search you'll find where TdeP says the OPT impedance is 4.8K.
There are photos of the commercial amp innards to give you ideas for the layout.
It is a very stable reliable design.
best
tim
any way, you do not have to make up your mind now, but make provisions for a ground dc lifter, when the amp is running listen for spluttering noise on your speakers, if you hear none, then congratulations, you do not need to do anything more....
but if you did hear some noise, connect the dc lifter on the first tube and that should clear the noise..
there is an unwritten rule with tube circuits, that is never leave any element floating however if unused.....filaments included...thus we see in many cases, one side of the filaments connected to ground...
but if you did hear some noise, connect the dc lifter on the first tube and that should clear the noise..
there is an unwritten rule with tube circuits, that is never leave any element floating however if unused.....filaments included...thus we see in many cases, one side of the filaments connected to ground...
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