I have got my BA3 preamp up and running (into peter daniels gainclone and then original spendor sa1 speakers) and am very happy with the music it is producing - way better than anything else I have used (audio synthesis passion passive mainly). It has added way more clarity, depth, power, precision but it is a bit hissy(er) than I would like. Basically I can hear a hiss/whooshy sound from a meter when not playing music and occasionally on very quiet sections. I have followed the build guide and used what I think are good bits i.e. all dale rn60s, mundorf evo oil output caps etc, alps blue 50k pot and tubecad input selector and ps19 bipolar supply. It powers up nicely with no thumps or bumps etc. and is biased pretty much bang on 1v as specced. I am just a bit perplexed at what I think is just a bit too much hiss. It doesn't vary with change of volume control from min to max (with no music of course) and even at max volume there is only the slightest hint of hum - and none below it. Any ideas on where to look - or even confirmation that this is to be expected with a no feedback design would be appreciated.
thanks in advance,
Nigel.
thanks in advance,
Nigel.