No problems and thanks for the comments.  I am definitely planning to pass these among some of the members for a listen and write-up.  At this point, I'm just cleaning up a few final issues.  I realized that I needed to add an ultra-low output for the in-ear-headphones.  I've done that, but it...

Hi and thanks for the questions.   The amount of heat generated is not very great--much less than an equivalent 4 tube 6V6 amplifier running in the 15W range.  I use it in my small office for the computer speakers.   Regarding output--it will deliver between 1-2 watts to a speaker (4-12...

This was a television tube replacement for the 5U4.  A little more rugged with a little better current at high voltages.  It is a good tube--not used very often.  Great replacement in a power amp.

Realize that--I'm not selling tubes here.  Just noting that the Round Plate 6SN7 Tungsols are basically unobtainium these days.

I was astonished by the number of posts on the 6SN7.   As a designer of high-end tube audio gear (coffmanlabs.com) I thought it worth sharing my experience from the design side. YMMV  And just to make it clear--I do plan offer some of my products with the 6SN7; I have around 4,000 to 5,000...

From Damon@coffmanlabs.com   A big thank you to everyone for showing up!  I had a blast and it was great to meet everyone.  We should do more of these if Kurt is up for it.   As I mentioned to some of you it was a bit of a scramble for me to get our new Coffman Labs H1-A headphone amp...