Hi Gang. Perhaps I should chime in here regarding the 6J5. The 6j5 is basically 1/2 of a 6sn7, whereby the 6sn7 is a dual triode and has two triode sections and the 6j5 has just one triode section.In the cortese,they both do the same job.For those that are interested,go to my post [ 09-09-04 ] Cello....Tung-sol rounds? It doesn't get any better than that IMO.I had better take this oportunity to thank you for the tape drive you sent me......Thanks again sir, you are a gentleman and a scholar. In my syrah, it inevitably boils down to the "voice" of either the sylvania 6sn7 wgt metal or the tung-sol round. With live jazz in an intimate small club setting or smaller chamber works etc, I love the tung-sol round here. Large classical recordings,or live power rock and blues etc... I prefer the voice of the Slvania metal. An interesting anology here and some food for thought.... To acquire nos sylvania metal based 6sn7 wgt's in a box, typically sells in the $200/pair neighbourhood [if you can find them] whereby the same vintage sylvania 6j5wgt metal with identical single plate construction will typically cost around $25-$30/pair. There are tons of different brands, vintages and flavours of the 6sn7 dual triode, however... for voicing the syrah in my rig,there are only 4 or 5 choices of 6sn7's, albiet all great ones. 1- Sylvania wgt metals, 2-tung sol rounds,3-kenrad blacks,4-rca greyglass gt and 5- the Ge sidegetters. By contast; there are also many choices and flavours of 6j5 as well as substitutes. Because the 6j5 was actually a precurser to the 6sn7, there were many types, from ST bottle shaped 6j5's, metal tube 6j5's, standard glass versions with flat plate construction,round plates and so on. Further more... unlike the 6sn7,there are also substitutes like the 6p5,6c5 and the 7193.To qualify things here gang. I am not saying the 6j5 is better than the 6sn7........just want to make everyone here aware of the options open to them regarding supratek preamps.