Hi guys-- Years ago I joined Head-Fi to find out about a Singlepower unit that came with a rack of high end audio gear that I purchased. Though I was no headphones expert, the Singlepower story was fascinating to me and had a feel of "classic and collectible" to it, so I just held on to the...

Hi--  I've been reading lots of the forums for about a week now-- got started because I Googled my Maestro ZR and you guys have a bit of a history with Singlepower.  My only immediate need is to find out if I will damage the unit or my headphones by firing up the amp with generic Russian 6SN7...