PLEASE READ THIS FIRST: we have gotten a considerable number of calls that relate to Electro-Harmonix 6SN7s installed in our equipment. These tubes appear to be unreliable; before pulling your hair out replace any and all EH tubes in your equipment and see how it works. If you are still having issues then contact us. Thanks!

F.A.Q. (Frequently Asked Questions)
Using Single-Ended Equipment with Atma-Sphere Preamplifiers
A visual test for 6AS7G output tubes
Archive

Manuals (Adobe PDF Format)

Preamplifiers
MP-1 Mk.III preamplifier
MP-1 Mk.II preamplifier
MP-3 preamplifier
Music Line Stage MLS-1
P-2 preamplifier
Power Amplifiers
S-30 Mk.III
S-30 (all versions except MkIII)
M-50 and M-60 (both are considered Mk.I versions)
M-60 MkII.2
M-60MkII.3 w/autobias
M-60 MkIII
MA-1 Mk.III
MA-1 Mk.II
MA-1 Silver Edition, middle version (5 switches on front panel)
MA-1 Silver Edition, final version (autobias)
early Novacron/MA-1.5 using 2 controls for bias
Novacron/MA-1.5 later version using 4 controls for bias
MA-2 MkIII
MA-2 MkII.3
Music Amplifier MA-3