i presume that the first tube is working as a buffer then the second makes the riaa equalization ...and then the third ????what is it for ????
The RIAA is in two parts. A filter before, and after the middle tube.
I am wondering at the advantages of paralleled input tubes, and also why all the paralleled load resistors.
The 3rd tube looks like an attempt to provide a low impedance drive with using cathode follower. Some people don't like to use cathode followers - say they sound bad. Not sure I agree.
i ve seen a phono stage that works with ecc83 and i was curious if possible to convert the circuit to make operate with 12ay7.....
hotbottle said:My comment on the power supply is that it is way over-complicated. Maybe I am going against common wisdom here, as I haven't been posting here long, but I am in favour of keeping things simple. I don't, as a rule, use regulated power supplies, especially not for heaters. If people disagree, well at least it'll make for an interesting discussion
I run my phono stage heaters from DC, but it's a simple filtered supply. I arrange to drop enough voltage by resistance, so that the heaters end up with correct voltage on them. Why should it ever vary enough to matter?