Dynaco PAS upgrade kits, 
PAS New Generation Preamp kits
ReVox & Studer upgrade kits

Erhard Audio

Appointed USA & Canada distributor and reseller for Audioamp Auto Bias Modules
Why buy Erhard Audio tube stereo gear.....
Erhard Audio - Custom, handcrafted vacuum tube audio gear
Designed and built for the discerning analog audio enthusiast
Appointed USA distributor and reseller for all Lundahl Transformers
Important message regarding the current tube shortage, please click here