Are you still using a Krell FPB amp?
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"Third position from the left", I believe is tubes 3 and 6. Those are the balanced input buffer tubes. Are you running in balanced and single-ended mode? If I remember correctly, the common recommendation is that if you are running single ended, that 3 and 6 are not important and I have read people saying you can even remove them, although I have not tried that. Can you elaborate on your recommendation for upgrading 3 and 6? Thanks.
DTC: I am running balanced & yes the 3&6 are the inputs. I do not know if you can remove these if running single ended. I purchased the preamp here on Agon from an individual I believe was an electrical engineer & he said the 3 & 6 slots were the most important & that is where I put the rarest or best tubes.
Rodman: I was afraid somebody would ask that question and that is why I didn't post this until I got a decent reserve.I liked the Ken Rads followed by the National Union and then the Tung Sol roundplates.The Ken Rads were the best all around in my system with just a little more detail and a great soundstage .The National Union's had a little more bass. I found all the brands perform very well however and given their age are surprisingly reliable. If anybody tries the 6F8G's I would like to hear their impressions.
The 6F8Gs are a great value since they are an equal to 6SN7s and still much cheaper. I have been using a pair of TS with oval mica and really like them.
I recently purchased a pair of Ken Rads which I haven't tried yet.
BTW, if anyone needs adapters I know someone who makes very nice ones for $40-$50 per pair.