6P3S
tubes. Other tubes are also compatible with adapters so in
case of doubt, please contact us.
As 6L6 tubes come with vastly different plate dissipation ratings, it’s
very important to select the correct tube profle for the installed
tubes. In particular, the older NOS 6L6 tubes are rated for lower
voltages and power than modern 6L6GC tubes and will suffer
catastrophic failure if used with the incorrect profle.
Summary of supported power tubes:
6L6, 6L6G, 6L6GA, 6L6GB, 6L6GC, 881, 6P3S
The power tube type must be manually indicated using the
Tube
Profle
option in the
Settings
menu.
Please note that an added beneft of the tube profle circuitry is that
it ensures perfect biasing of power tubes during all their lifetime
without any need for manual adjustment.
Tube
Profle Name
Supply
Voltage
Notes
6L6
360V
6L6, 6L6G
All tubes with a 19W plate dissipation.
6P3S
360V
Russian NOS 6P3S tubes.
5881
400V
5881, 6L6GA, 6L6GB
All tubes with a 23W plate dissipation.
6L6GC
450V
6L6GC class AB profle
All tubes with a 28W plate dissipation.
6L6GC (A)
400V
6L6GC class A profle
All tubes with a 28W plate dissipation.
Table 1: Tube Profles List
Using the incorrect profle can destroy the installed tubes
and damage the amplifer!
Arcus Integrated Amplifer
Owner’s Manual
Page 22