I don't question their value at all. They can sound really good if you know which ones to use and implement them properly.
I've built and listened to a couple of the JC-2 clones. They sound okay for the money...nothing spectacular.
While I don't like bright-sounding amplifiers, I find the 6SN7 to sound a little too dark.
Bearing in mind this is a dc-coupled line amp with 4.3 gain, the only reason of being "not very deep" at low frequencies I can imagine is impedance matching with your power amplifier. Try to add a follower at the output of the preamp in order to achieve a low output impedance.
... Thanks for your advice , but what do you mean by "add a follower" ?...
I have to lower the output impedance of the preamp ?
I have to add such a buffer ... ?
Exactly - you need to lower the output impedance.
Here is a top quality buffer for your purpose.
Cheers,
Valery
Attachments
Ah - yes, please don't pay attention. My simulator model's markings.
One should use the same grade. B or C are preferred.
No, I have just developed the schematic for you 🙂
You can bread-board it easily, I believe.
To be honest, I'm not a big fan of the tube buffers. X10D's output is taken from the anode, so... I don't consider it as a good thing for the purpose. Yes, it's called "buffer", but it does not really give you the low impedance output.
Hi.., You have tested it? Did you hear how it sounds? I can use, according to you, only as a preamp ....
I used this kind of topology many times in my designs.
This kind of buffer, if built correctly, does not sound. You can treat it as a piece of wire with high input impedance and low output impedance - 0db voltage gain, virtually zero distortion.
Hi! ... This schematic is for one channel, right? ...... Do you think I can use the same PSU preamp, for the supply of voltage buffer ...?
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