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I would like to build a new amplifier, this time with classic tubes references.

I wonder if I have drawn the see saw / paraphase inverter correctly?

Maybe a little bit of gNFB will be needed, in this case is it better to remove local feedback between ECC82 and EL34?

I didn’t find max value of Rg1 for EL34 in fixed bias mode, 80-100K is fine?

OPT is 4.2K / 8 ohms with 2 & 4 ohms too (Quicksilver), maybe I’ll use 4 ohms tap with 8 ohms speakers for better damping and easier life of EL34’s. 20W is more than enough for my use.

Do you see errors on this schematic?

Thank you.

Attached Images

Screenshot 2019-11-16 at 21.25.55.png (546.6 KB)

I would like to build a new amplifier, this time with classic tubes references.

I wonder if I have drawn the see saw / paraphase inverter correctly?

Maybe a little bit of gNFB will be needed, in this case is it better to remove local feedback between ECC82 and EL34?

I didn’t find max value of Rg1 for EL34 in fixed bias mode, 80-100K is fine?

OPT is 4.2K / 8 ohms with 2 & 4 ohms too (Quicksilver), maybe I’ll use 4 ohms tap with 8 ohms speakers for better damping and easier life of EL34’s. 20W is more than enough for my use.

Do you see errors on this schematic?

Thank you.

Attached Images

Screenshot 2019-11-16 at 21.25.55.png (546.6 KB)

I would like to build a new amplifier, this time with classic tubes references.

I wonder if I have drawn the see saw / paraphase inverter correctly?

Maybe a little bit of gNFB will be needed, in this case is it better to remove local feedback between ECC82 and EL34?

I didn’t find max value of Rg1 for EL34 in fixed bias mode, 80-100K is fine?

OPT is 4.2K / 8 ohms with 2 & 4 ohms too (Quicksilver), maybe I’ll use 4 ohms tap with 8 ohms speakers for better damping and easier life of EL34’s. 20W is more than enough for my use.

Do you see errors on this schematic?

Thank you.

Attached Images

Screenshot 2019-11-16 at 21.25.55.png (546.6 KB)