DECWARE OWNERS MANUAL – MODEL SE84C+
START UP
After unpacking your Zen amp install the tubes as shown in the pictures above.
ABOUT THE TUBES
Your amp is configured as a single ended triode with a single output tube per channel.
The output tubes can be your favorite EL84/6BQ5 or SV83/6P15P-EV. The amp has been
designed with a common cathode bias circuit o that the two output tubes remain
matched during operation even if you use unmatched output tubes. This concept is also
referred to as “self-balancing” and ensures perfect image focus even as the tubes age.
The small tube in the front of the amplifier is called the input tube and it's purpose is to
raise the input signal to a level sufficient to drive the output tubes. This small dual triode
is handling both channels. You can use either 6N1P or 6922 or 6DJ8 tubes in this
location. This is the tube that will make the the biggest difference in how the amplifier
sounds. Since the signature of each tube is different, even different brands of the same
tube type, using a dual triode is an advantage because it keeps the channels timbre
matched.
The last and largest tube is called the rectifier tube and can be your choice of 5U4, 5AR4,
and even 5Y3GT. This amplifier should not be used with 274B rectifiers without first
being modified by Decware. Trying different rectifier tubes will also change how the
amplifier sounds.
TUBE LIFE
The output tubes are the main tubes that wear out. We ship the amp with premium mil
spec Russian 6P15P-EV tubes with extra thick glass and extended tube life. You can
expect 5000 hours from a set. Tubes in this amp are biased to aprox 45 mils.
As output tubes wear out, they become softer sounding. Best way to tell if you need new
output tubes is to install a new pair and see if the amp sounds stronger. If you hear no
change, put the old tubes back in the amp and try again in 6 months.
Input tubes will usually last through 2 or 3 sets of output tubes, but again having spares
on hand lets you find out any time you want what the status is. Rectifiers can last up to
the life of the amplifier, however they are also the first in line to get hit by power surges
during thunder storms, etc., so they can appear to fail for no reason from time to time.
Always have a spare rectifier on hand. If a rectifier blows, the fuse will blow. Sometimes
rectifiers will simply arc and then work fine. This is not uncommon.
Manufactured by High Fidelity Engineering Co. WWW.DECWARE.COM
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