Brimar 13D3 Solgt

Nos par 13D3 rør selges, en 12au7 variant fra Brimar.
Måler alle rør på Avo Vcm 163 tester, sender for kr 70.-
13D3

IMO if you need something in the range of a ECC82/12AU7A the 13D3 would be the better choice.
And I just love these black graphite coated plates,they have something the others don't...a bit of magic.
What to do with these tubes? | Page 2 | diyAudio

This is a very special tube and not only for its sound. CV4068 (also known as 6158 ) is an ultra-rare version of the ultra-rare 13D3 tube. That’s double ultra The tube hasn’t been created for audio, but performs extremely well in 12au7 circuits, although it does produce more gain (30 vs 17) – transconductance is also a bit higher (2.5 vs 2.2)
The sound is very transparent, but not fatiguing. The tube sounds very full in the mid-range – close to Mullard, but more transparent on the top, making the tube sound more airy than the Mullards. Great bass – tight and full.
Brimar CV4068/13D3 Black Plates - Tube Maze

13D3 Brimar England black plates tests like new 1962 (6.8ma/7.2ma)

2 X CV2212 / 13D3 MULLARD TUBE. MATCHED PAIR 17mm PLATES 1950s TUBE. NOS/NIB. RCB41