diyAudio (
-   Analogue Source (
-   -   May I have your ideas for this opamp>LCR>opamp>tube>output transformer phono stage (

Witti 10th November 2011 08:17 AM


Originally Posted by Bonsai (
Looks good! Good luck with the audition.

How are things going with te flood by the way?

Thank you.

Please see through the link Bangkok Underwater - Alan Taylor - In Focus - The Atlantic

Witti 16th November 2011 02:28 PM

The back panel of the phono box. ^ ^

Witti 16th November 2011 05:33 PM

I would like to add one more YouTube video. ^ ^

Don't Know Why Seven Years Norah Jones KENWOOD KD 600 SME 3009 S2 improved clearaudio aurum beta S LME49710 LCR 5687 phono - YouTube

Sound of the phono in below picture was directly recorded by notebook computer.

Witti 5th December 2011 05:02 AM

The 2 boxes version phono preamp has been finished. ^ ^

May I know what should I do if I would like to hear no hum (deadly quiet) while fully up volume at preamp. Kindly advise please... Thank you :cheers:

What I have done
- power transformer has been seperated
- star ground
- opamp circuit has been shielded with small closed aluminium box
- vacuum tube has been shielded
- shielded signal cable has been used

lcsaszar 5th December 2011 12:43 PM

Do you have AC heating of the tube?

Witti 5th December 2011 01:27 PM


Originally Posted by oshifis (
Do you have AC heating of the tube?

No, I don't.
It is a floating DC.

lcsaszar 5th December 2011 02:37 PM

Floating? You can try fixing one side to a fixed potential (GND, or elevated but AC grounded by an electrolytic capacitor).

Witti 31st May 2013 03:57 AM

Here is the missing schematic.

An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.

All times are GMT. The time now is 05:04 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio