A partial update on tube evaluation. Here’s part of a blurb (edited) I posted on AVS forum.
"…and I’ve spent lots of time and WAY too much money on 6DJ8-type tubes. A few weeks ago, a friend and I did a first session of evaluating and culled the Tungsram 7D8s lots of people love and also the inexpensive Soviet-era 6H23ps. This first time thru, the British-Mullard-made, R.T.C.-labeled E188CCs won. These were rather expensive at $420 per set, and then I bought two more sets! I’ve added a few more candidates including two sets of Seimens, West-German-made PCC88/7DJ8s and a set of Mullard-labeled, British-made E188CCs. It’ll take another couple weeks to get all of these run-in (four days per set of tubes)*, and then the ‘fun’ begins anew.
- It’s AMAZING–it actually takes FOUR entire days to get 4 days of run-in on a set of tubes! " …
So it’ll be all-three sets of RTC-labeled Mullard E188CCs, the Mullard-labled E188CCs, and two sets of Seimens PCC88/7DJ8s…and maybe another set of Mullard E188CCs, these used and significantly less expensive. Jeez! One would think I didn’t have a life! …
BTW, I’m running all this stuff–DP, preamp, two poweramps–24/7.