Blue Jinn
Well-known member
and how to improve it?
Hello,
I joined a discussion over at another forum about this circuit. I picked on up rather cheap on a lark.
The tubes are 6N3 (Chinese version of 2C51 AFAIK) I haven't measured B+ under load, but I'd guess about 200v. (The psu has 150VAC going in, 2x 270uF/1k RC filters, and a 150k resistor strapped across the output. The heaters are AC, but they also have LEDs for a glow underneath the tube sockets. !
It is supposed to be a buffer, but has some oddball design features. I redrew the schematic from one I was sent by a seller. (which had a glaring mistake on it...) Ignore the tube pin numbers. (They are each one half of two separate tubes.)
The 50k output pot seems to defeat the purpose of a buffer and the 10k resistor on the input seems like it could be higher, or even eliminated.
Any other thoughts about what the designers might have had in mind? And thoughts for improvements?
I had thought about eliminating the pot altogether, and the 10k resistor on the input (R2) or increasing it? Also it seems odd that the output has two caps in series. Perhaps eliminate the .33uF?
Hello,
I joined a discussion over at another forum about this circuit. I picked on up rather cheap on a lark.
The tubes are 6N3 (Chinese version of 2C51 AFAIK) I haven't measured B+ under load, but I'd guess about 200v. (The psu has 150VAC going in, 2x 270uF/1k RC filters, and a 150k resistor strapped across the output. The heaters are AC, but they also have LEDs for a glow underneath the tube sockets. !
It is supposed to be a buffer, but has some oddball design features. I redrew the schematic from one I was sent by a seller. (which had a glaring mistake on it...) Ignore the tube pin numbers. (They are each one half of two separate tubes.)
The 50k output pot seems to defeat the purpose of a buffer and the 10k resistor on the input seems like it could be higher, or even eliminated.
Any other thoughts about what the designers might have had in mind? And thoughts for improvements?
I had thought about eliminating the pot altogether, and the 10k resistor on the input (R2) or increasing it? Also it seems odd that the output has two caps in series. Perhaps eliminate the .33uF?