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In Reply to: RE: Choke or CCS loaded ECC83 in phono stage? posted by Tube747 on February 06, 2025 at 08:53:40
Choke loads will have the same issues, more or less. CCS would be the way to go, in my opinion.
I'm recently working on very similar thing. Here's my friend suggestion.
" was talking about a resistor ACROSS the inductor! so the low DCR of the inductor will be used!!!
THAT shunting offers a real need, sets the impedance of the inductor to its value
Using a choke (inductor) as plate load and shunting it with a plate load resistor, will offer more plate voltage to the tube used. due to the plate load resistor will be the load impedance, not the DCR,
The choke will be maybe 50 ohms or so......"
Frankly, I don't know how to do that.
Is this approach okay 🙂
Paul,
After talking to my friend and he reminds me the CCS will make the linestage has too much of gain. And it required some change of feedback.
And he suggests I put a 400H plate choke with 3000 ohm DCR in series with, let's, say 267K resistor; so it ends up 270K for the plate load of the first ECC83.
And I can do the same thing to the second tube (same choke with 97K resistor).
What do you think?
If you are building a linestage, why use an ECC83 in the first place?
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