Orphan Audio | OrphanAudio.com Support for Quad Eight™, Langevin, Electrodyne, Sphere, Helios, Ampex, and many other discrete transistor and hybrid audio equipment from the 60’s, 70’s and early 80’s with complete modules, parts, service, custom packaging, mods and engineering.
	TapeOp Magazine | TapeOp.com Free subscription to this killer mag about recording for the pro, semi-pro and amateur.
	GearSlutz Forums | GearSlutz.com More talk! Some intelligent.
	VintageAmpRepair | VintageAmpRepair.com Randy in Columbus, Ohio repairs and has QE gear.
	Boutique Audio & Design | BoutiqueAudio.com Custom and standard rackmount enclosures for classic pro audio modules, sidecar console systems and high end pro audio products. Manufacturer of the Orphan Audio 1ru modular rackmount system.
	Jensen Transformers | JensenTranformers.com World Famous Audio Transformers for Build-It-Yourself and OEM Applications. Check out their applications and white papers pages for excellent build tips.
	CineMag | CineMag.biz One of the first audio transformer manufacturers in Southern California, and maker of Quad-Eight, Sphere, and many other famous pro audio OEM transformers. Formerly Reichenbach Engineering.
	Manley Labs | ManleyLabs.com Manufacturers of the finest tube and transistor, studio and home audio gear we have ever seen. Home of modern Langevin brand products and manufacturer of the highest quality Pultec recreations and derivative products.