6SN7. That explains a great deal.
I have owned more microphonic 6SN7 tubes than any other tube type. Many of them have been the highest priced, most sought after varieties.
Having said that, the one 6SN7 preamp I owned sounded fabulous when the tubes were all good.
Good luck. I'm sure you're going to love the preamp when the tube situation gets sorted out.
For excellent quality, guaranteed 6SN7 tubes, I suggest contacting Andy at Vintage Tube Services.
I have owned more microphonic 6SN7 tubes than any other tube type. Many of them have been the highest priced, most sought after varieties.
Having said that, the one 6SN7 preamp I owned sounded fabulous when the tubes were all good.
Good luck. I'm sure you're going to love the preamp when the tube situation gets sorted out.
For excellent quality, guaranteed 6SN7 tubes, I suggest contacting Andy at Vintage Tube Services.