It is sweet to update this project while listening to the results. The amplifier is working really good with a warm response full of details and amazing low tones. The KT88 fits perfectly with the designed output circuit giving a pleasant result for the phono and line inputs in ultra-linear and triode configurations.
This SE system is developing around 15W in each channel and driving without problems 3-ways 100W speakers. The phono RIAA preamplifier fits the expected response curve close, but still can be improved which will be done in short.
There is a possibility to obtain a little more of gain in the RIAA preamplifier, but in exchange for a worst SNR. The amplification taking place in this four stage circuit is noticeable and touchy to perturbancies that must be taken into account in any modification.
Some details to hit the summit, the VU circuits and the HV-Standby control circuits. Both of them to be installed in the following days.
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