Next the sound IF stage, plus!

[AdrianPH]

Hi Amie,

I class myself lucky I am not part of the 'audio-fool' crowd and thank the lilitary that they want valves that have long service life and can deal with shock and vibration. I have seen on Ebay matched pairs of the EF91 being sold.
I did build a stereo amp that has EF81, ECF82 and TT15 per channel, I was told I should not use the EF91 as it is microphonic, noisy etc. Works fine for me, no problems.

Adrian