TUBE ROLLING
The Arcus amplifer allows several tube types to be installed to tailor
the sound signature to your tastes.
There are two sorts of tubes used in by the amplifer, each with a
specifc function:
•
Two 6SN7 tubes for the voltage amplifcation
•
Four 6L6 tubes for the power amplifcation
The sections below contain additional information about which
tubes from those families are compatible and how to use them.
Voltage Amplifcation Tubes
The voltage amplifcation section uses two dual-triode tubes from
the
6SN7
family and any new or NOS tube from any brand can be
used.
Thanks to the amplifer’s ability to supply both 6.3V and 12.6V
flament heaters, NOS
12SN7
tubes can also be installed thus
broadening the range of supported tubes. The amplifer will
automatically detect the voltage required during warm up and no
manual intervention is needed.
But there’s more: using a simple Loctal to Octal socket adapter (not
included), the
7N7
and
14N7
tube families can also be used opening
up access to a very broad range of high quality NOS tubes.
Summary of supported voltage amplifcation tubes:
6SN7, 12SN7, 7N7, 14N7
Power Tubes
A unique feature of the Arcus Amplifer is its ability to adjust both the
supply voltage and the bias current of the power output stage to
enable the use of all
6L6
beam tetrode family tubes.
The main 6L6 family consists of
6L6, 6L6G, 6L6GA, 6L6GB, 6L6GC
types. Additional compatible tubes are the
881
and NOS Russian
Arcus Integrated Amplifer
Owner’s Manual
Page 21