JoaMat

Finally she (in the middle, on the Prosecco) arrived from India. Surrounded by her new family.

Looking forward a glimpse of your final enclosure. I’ve no suggestions regarding reducing the gain. Maybe there are folks out there that have.

Thanks for image. Indeed very creative built. No need for fancy cabinet I’d say, unless you have children or cats. Maybe an IR module with the motorized potentiometer for remote convenience.

Congratulations to your successful build of the Carbon. The world needs more good amplifiers. Do you mind post some images?

Great, thank you. To be able to see the trailer I had the VPN service pointing to U.S. I’m sure this is what I saw tonight on the Swedish Public Service.

Swedish television sent a documentary tonight “Miles Davis – Birth of the Cool” https://www.svtplay.se/video/25354227/miles-davis-birth-of-the-cool , can only be seen in the Swedish mainland?. Maybe a VPN service pointing to Sweden might help. Speaker voice and sub title in Swedish, but the rest in English. And the music speaks for itself. Else – Kind of Blue – 31 versions on Qobuz?! Kind Of Blue (Mono Version).pdf

As the good father I’m I gave my son my NAD M51 DAC. I think he needs decent equipment with balanced outputs. So now use this as my DAC. Sounds great!!! Don’t understand why I didn’t finished this long time ago… wife is very understanding…

Nice! Put my order yesterday at GMT11:00. DHL estimates time of arrival (at my door) on Monday before GMT17:00.

Try MKS2-.47/63/5T, almost same thing? different price.

Qobuz has 13 versions of Miles Davis – Birth of The Cool. A marketing trick signed Philip Kotler?

IMO you need steel screws to apply adequate torque – what now that might be? I apply 81 Ncm – but PEEK is certainly OK.

When Art Blakley – Moanin' finished my Roon recommended: Miles Davis – Birth of The Cool Date recorded 21 Jan 1949 -9 Mar 1950. (Ref. Roon)

Saw Count Baise at Palais des Beaux-Arts, 1961 on Mezzo TV. Sometime YouTube is great.

Johan Dalene – violin. Still a teenager I think, but he'll grew older.

Thank you, Michael. Working on a layout... we'll see what happens.

A gentleman told me about the electrostatic amplifier Sirrah designed by Andreas Rauenbuehler. See http://www.high-amp.de/ . Inspired by Sirrah I draw this sketch… …20 mA per channel. Accompanied with small GRHV regulators and 50VA transformer - could be built in a small box for the bedside table? maybe it won't work at all.

I like this “beginner”, his first album? Wow! Thank you. P.S. His touring …

Didn’t found it on streamers but some kind person in Germany sold me this CD. Thanks! Worth every pfennig.

Thanks a lot, mwl168 and jamesmking. Your information indicates – as I interpreter it - the voltage differential is in the region 30 – 40 volts. Good to know.

84,3 VA. Voltage * current of each winding. Then add VA of all windings. Done. Reservation for errors!

Regarding GRHV regulators. What’s the minimum voltage differential/headroom for the GRHV to work properly?

Well, I use some old DIY T2 supplies for all my amplifiers. For LV and filament transformer I have the following windings 15V + 15V / 0.5A (center tap) 6.3V / 4A 6.3V / 4A 6.3V / 1.5A 6.3V / 1.5A You don’t want to use same winding for small and output tubes. Separate windings for channels. So total four filament windings. Demands for HV is 60mA for output stage and 20mA for input. With +220V supply you I suggest 195V/0,06A 320V/0.18A 365V/0.18A \\135VA Without +220V supply, feeding input positive via 20k power resistor, I suggest 320V/0.24A 365V/0.18A \\143VA Calculations are based on 50V headroom and current factor of three (some builders may want another factor). Reservation for errors!

Lazy engineer/designer

Frankly I expected OP27 to fail sooner or later. I’ve had several OP27 failures, only the offset servo – no balance servo failure so far. I hope that the OPA197 is more robust. I’ll use OPA197 from now in new builds… as long as they work properly…