INSTALLING THE PREAMP TUBES, THERE ARE 3 THAT ARE INSTALLED IN THE FRONT OF THE AMP, THEY ONLY FIT IN THE SOCKETS ONE WAY…

1^ST TUBE

2^ND TUBE GOES HERE..

AND THE 3^RD TUBE BEHIND THE TRANSFORMER…

THE 2 6550 TUBES WITH THE GUIDE PINS GO IN THE FRONT SOCKETS THE PINS WILL ONLY ALLOW THE TUBE TO GO IN ONE WAY…

THE 2 POWER 6550 TUBES INSTALL LIKE THIS…

THE OTHER 2 TUBES GUIDE PINS ARE MISSING,… BUT HAVE ARROWS ON THEM TO HELP YOU INSTALL THEM AND LINE THEM UP

THEY ARE INTALLED LIKE THIS…

THEY ARE POSITIONED 180 DEGREES OPPOSITE OF THE FRONT 2 YOU JUST INSTALLED…

NOTE THAT THE ARROWS LINE UP WITH THE RIVETS I MARKED…

AND IT WILL LOOK LIKE THIS WHEN YOU HAVE THEM INSTALLED CORRECTLY…

WHEN YOU TURN ON THE AMP THE TUBES SHOULD LIGHT UP IF INSTALLED CORRECTLY…