Hi-Fi - Last Details

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.

Update of the 15W-15W Hi-Fi Tube Amp

Lack of time is what always lags behind projects. Finally, the phono preamp is nearly finished. The configuration is different from the original one, in this one 4 double triodes are used instead of the original 3. The RIAA respond is based in pasive RC filtering. The final result is much better and fitted in the RIAA curved with a clean output. The SNR and final gain are not measured jet, but it sounds as a perfect preamp for MM&MC cartridges.

I have enjoyed a little bit of  Jazz, Blues and Rock with some interesting tonal features, although as soon as it is integrated with the KT88 power stage, it will require some calibration based in owner's taste to empower the experience.

The power supply is in prototyping  process. Hope to get it ready ASAP in order to deal with the power stage.

While working in the phono preamp, some ideas for a future guitar & bass amplifier, it is in the "must do" list.

Newbie in Hi-Fi family

Initial goals:

Around 15W+15W true tube, line and phono MM/MC inputs, SNR around -90dBV, penthode and ultralinear operation for everybody's taste, microcontrolled power supply, speaker protection, dynamic standby etc.

This is the first idea and starting point for the possible configuration of the Hi-Fi amplifier with phono preamp.

Next Project

We have a new project, a warm and tasteful Hi-Fi true tube amplifier for a 50m2 listening room. The device must include a phono preamp. After formal proposal and a few client design personalizations I have received the "Set sail!".

We will try to show the development of this special amplifier borned in the crossway of pure tube touch and today's tech.

The Born of an Idea:

A few days ago, Pepe contacted me requesting a proposal for a tube device with which he could enjoy his amazing vinyl collection to a new level. While grounding details, I was able to enjoy a little bite of his collection:  Genesis, ELP, Jethro Tull, King Crimson, Eric Clapton y John Mayall, Miles Davis y Coltrane and of course Neil Young. Among all we took a break with Pink Floyd album Pulse (1995 UK limited edition 25-track 4-LP vinyl box set), an analog recording willing to release all its power through a valve amplifier!

Future amplifier's full time work localization

Here we have the phono player waiting for its partner.

Pic of the commented Pink Floyd treasure!