Well to finish up my tube adventures for this year I'm waiting on a pair of Mullard Mitcham '58/59 E88CCs and also jumped on the D-Getter '58 Heerlen ECC88 (no gold pins). So after I get everything I'll have the following 'matched' pairs:
1) Amperex Orange Globes '69
2) '70/'71 A-Frame Siemens E88CC
3) La Radiotechnique French E188CC Dario Miniwatts '66/'67
4) Heerlen E188CC Dario miniwatts '62
5) 6n23p 1975 HGs Reflektor SWGP
6) '62 Heerlen Valvo E88CC (my favorites so far strangely sound better to me than their '62 E188CC variant, the valvos are 36L and the darios are 13L - really strange indeed)
7) Siemens '62 E88CC A0s
---(not received yet)
8) Mullard Mitcham' 58/'59 E88CC
9) ECC88 D-Getter Heerlen '58 (from mercedesman on ebay - he has some more of these of '59 and '60s)
10) Tested batch of 16 random 6n23ps wiuth good measurements
After I've got enough time to listen I'll try to write down my impressions maybe they'd be helpful to someone ( my sound vocabulary isn't that great), but so far my rankings are the '62 E88CC Heerlens, the E188CC '62 Heerlens, Siemens E88CC A0 '62s and 6n23p HGs, french E188CC, rest don't compare well to these at least from what I can hear.