The schematic is correct, but look at your photo, it seems the 56K is connected to the LED at one end with the other end connected to the 220ohm
The LED is connect between the 220R and 56R not 56K, you swap the 56R and 56K
To suply a preamplifier whith 2 ECC82 how many ma do I need?
Quick reference (each unit) of ECC82
Anode curent Ia= 10.5 ma
Tranwconductance S = 2.3 ma
One SSHV2 is enough?
Quick reference (each unit) of ECC82
Anode curent Ia= 10.5 ma
Tranwconductance S = 2.3 ma
One SSHV2 is enough?
Heat with wood. The woodburner is in the same room. Personally, I like the south so I don't mind it being warm in that room. The rest of the house is cooler, or down right cold.Isn't winter in the USA? Can you survive with 28C in the room?
Don't know where someone biases in which schematic, but more than 20mA for a pre sporting a couple of ECC82 must be rare.
Did it Wednesday night I think. Can't remember now, it was the day after I posted the FFT's.
Oh my good you are right, I have to connect the 220R gate resistor between the LED's string & the 56K😱
I am glad to have the motto why buy one part a full price when I can buy 10 for the price of 9.99. I had spares luckily.
Thank you very much bigpandahk, I'm happy my CCS is going on perfectly well after 10 minutes, old tx & IRF9610 used.
Now what I have to do: connect the rest of quanghao pcb with old tx or try first with Bartolucci tx and after connect the rest quanghao pcb?
Attachments
Now I understand, I use central heating (gas heat a close circuit of water) with a temperature regulator fixing the temperature that I want 20º-21ºC🙂
So I will turn R4 until the reading in T.P. is 0.3V. That meens 30mA which I think is enough to suply my pream.
The pream.,schematic
DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamplifier
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I see about 5mA on that SRPP per channel, so 30mA CCS for single common reg is fine and economic.
Aha, progress. Why not you continue to create full reg on that same board with same rectification and Tx as you are having success...
Yes it's the more logical, once all going OK with old tx I will change to see what happens, thanks for support Nick.