Dear community I am planning to build a transformer coupled linestage
but I dont see how to separate the power supply from the two output transformers
other than building two powersupplies.
Any suggestions? Thanks
but I dont see how to separate the power supply from the two output transformers
other than building two powersupplies.
Any suggestions? Thanks
Must to duplicate CH2-C2.
CH20: 8H, C20: 100u/400V for another channel (from CH1-C1 connecting point).
CH20: 8H, C20: 100u/400V for another channel (from CH1-C1 connecting point).
There is lots of B+ filtering to run the output transformer/output tube stage.
Just change the last capacitor from 100uF to 200uF to run both the left and right channels.
Even at 20Hz, a very rare, and a very low frequency audio signal . . .
200 uF capacitive reactance (impedance) is 40 Ohms.
The 5687 plate impedance is 2000 Ohms, and your output transformer is hopefully at least 5000 Ohms. Those are in series, 7000 Ohms.
The ratio of ((7000 Ohms)/2) Ohms is 87:1
I divided by 2, because the 2 channels are 3500 Ohms total load on the power supply.
[both channels in parallel, and 200uF]
200uF is a simple change that will allow you to hear very good performance, and be able to stop worrying and sleep at night.
Make things as simple as possible, but no simpler.
Just change the last capacitor from 100uF to 200uF to run both the left and right channels.
Even at 20Hz, a very rare, and a very low frequency audio signal . . .
200 uF capacitive reactance (impedance) is 40 Ohms.
The 5687 plate impedance is 2000 Ohms, and your output transformer is hopefully at least 5000 Ohms. Those are in series, 7000 Ohms.
The ratio of ((7000 Ohms)/2) Ohms is 87:1
I divided by 2, because the 2 channels are 3500 Ohms total load on the power supply.
[both channels in parallel, and 200uF]
200uF is a simple change that will allow you to hear very good performance, and be able to stop worrying and sleep at night.
Make things as simple as possible, but no simpler.
Wow thank you for that answer 6A3sUMMER!
I grew up on the cusp of solid state and the dissapearance of tubes.
Even then to me tube amplifiers sounded better compaired to what
was available then for normal money.
I never really learned a lot about tubes so I am very gratefull if someone
who knows this stuff answers!
I grew up on the cusp of solid state and the dissapearance of tubes.
Even then to me tube amplifiers sounded better compaired to what
was available then for normal money.
I never really learned a lot about tubes so I am very gratefull if someone
who knows this stuff answers!