![[-]](https://theultimatetone.com/images/collapse.png "[-]")
08-31-2020, 05:28 PM
Kevin, I’d like to power scale this. With fixed and cathode bias both being used at one time, would SV1, VCK and RBX installation work well?
Also, I imagine lots of us on this forum have recently spent more time at home in front of an amp. I have. It is nice to have this one to play with so many possible tones. Part of the reason for building it was to use it for trying out mods I have read about in the TUT series. The 5F6 pre is covered very thoroughly and the DOPPEL has many of the power amp mods built right in. Rewiring the 5F6 follower into parallel triodes was, by far, the most rewarding change. Kevin has offered this advice many times. This amp now has parallel triodes before and after the EQ. Also has shielded OPT wires to the speaker jack to minimize coupling/oscillation. Several Ra, Rk and Ck changes. I have not tried to change anything in the power amp, except to dial in the bias supply. I wish now that I had installed a few extra switches and pots on the front.
Also, I imagine lots of us on this forum have recently spent more time at home in front of an amp. I have. It is nice to have this one to play with so many possible tones. Part of the reason for building it was to use it for trying out mods I have read about in the TUT series. The 5F6 pre is covered very thoroughly and the DOPPEL has many of the power amp mods built right in. Rewiring the 5F6 follower into parallel triodes was, by far, the most rewarding change. Kevin has offered this advice many times. This amp now has parallel triodes before and after the EQ. Also has shielded OPT wires to the speaker jack to minimize coupling/oscillation. Several Ra, Rk and Ck changes. I have not tried to change anything in the power amp, except to dial in the bias supply. I wish now that I had installed a few extra switches and pots on the front.
