ANK L5, Construction Manual

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Page 70
11.3.1 12AX7
The 12AX7 dual triode tube can be substituted by the premium NOS 7025 low noise tube or a number
of other current production tubes at very reasonable prices.
Before considering any other tube
substitution please mail me at audionotekits@rogers.com to discuss it.
11.3.2 6922
The sound of the ANK Audio Kits DAC 2.1 Signature is very highly regarded and it is one of our most
popular kits. It provides a detailed and transparent presentation with gorgeous sonics. Rolling some
nice NOS tubes will allow you to tailor the sound to your particular preferences. The 6922 dual triode
tube can be substituted by the readily available 6DJ8 at very reasonable prices.
Before considering
any tube substitution other than a 6DJ8 please mail me at audionotekits@rogers.com to discuss it.
11.3.3 5U4G
The directly-heated 5U4G full-wave rectifier is a 1930s design and there are classic era NOS 5U4G
tubes available at reasonable prices. Of course, audio lore is that the one to have is the Western
Electric 274B rectifier, if you can find one and have $1,000 or so burning a hole in your pocket.
Alternatively, you can use the Chinese 5Z3P(A); a well regarded NOS military grade version made by
Shuguang may still be available.
Beyond these, do not substitute any other 5V rectifier for the 5U4G
type for which the L5 Signature Phono Stage was designed; there are some significant differences
between a 5U4G and other rectifiers, with respect to voltage drop and current specifications, and the
result of a substitution is unpredictable and could damage your Phono Stage.