In this post I am sharing photos of the finished EC8020 differential phono stage and some sound impressions.
This is how the signal section looks in it's chassis:
This time in a light wood color.
The chassis is extended by 60 mm compared to the usual size of my preamps to make enough room for all the iron inside.
The power supply in matching color scheme:
Signal section and power supply:
The power supply chassis was left in the standard length and is a bit shorter than the preamp.
Of course if wanted they could be made the same length.
The big question: is it worth to use twice as many of the precious EC8020 tubes and so much iron?
Quick answer: Yes, absolutely. The result is stunning.
The complete absence of capacitors in the signal path of the gain stages is revealing.
The improvements are similar as in the differential line stage over the single ended version. More pronounced small details like little changes of timbre or vibrato in voices makes the reproduction even more life like.
The sound is projected layer over layer into the room. Each instrument or voice can be easily followed in detail. Yet everything plays in an integrated harmonic fashion.
The playback is very relaxed and enjoyable without loss of detail or dynamics.
Sorry for the rant, but you wanted to get some information about the sound, right? All I can say I am very happy with the result and am curious which revelations the all silver version will bring.
Now some photos of the phono in operation, showing the tube glow.
8 Telefunken EC8020 glowing away is a sight to behold!
Besides an all silver version of this, I will also develop a differential phono based on the D3a tube.