4
WARNING!
Do not power up supply before connecting power umbilical to
preamp; also, do not unhook preamp from power supply when powered.
This
could cause damage to the regulator circuits. Always wait 1 minute for the
supplies to discharge before hooking up or disconnecting the units if previously
powered.
Figure 1 - Rear panel of Preamp
record
record
out 1
out 1 out 2
out 2
phono
phono
Series Sixty-Six
Vacuum Tube Reference
Preamplifier
Series Sixty-Six
Vacuum Tube Reference
Preamplifier
Power
Power
~Caution~
lethal voltages within
disconnect from psu
before servicing
use only 12au7a and
ECC99 tubes
~Caution~
lethal voltages within
disconnect from psu
before servicing
use only 12au7a and
ECC99 tubes
video
video
dgtl A
dgtl A
dgtl B
dgtl B
tape
tape
tuner
tuner
Hand Built with Pride
in the USA
Hand Built with Pride
in the USA
66-001p
66-001p
The preamp has 5 unbalanced stereo line inputs, 1 unbalanced stereo phono
input, dual unbalanced stereo outputs and 1 unbalanced stereo recording output.
Connect your source components accordingly using high quality RCA style
cables. If using a turntable, ensure that the ground wire is connected to the
provided grounding post adjacent to the phono inputs on the rear panel.
Once you have your new preamp installed its time to fire it up! (The power switch
is located on the power supply). It takes a few minutes for the tubes to come up
to temperature.
Though you will get music after about 1 minute it’s best to let the
preamp warm up for at least 20 minutes before any critical listening.
.
Now some more things to consider as you’re enjoying the
music:
Feel free to try different brands of tubes, they all have a different sound and you
may like some better than others. Currently only one manufacturer makes the
ECC99 tube, but the 12au7a’s are available in many brands and vintages. The
tubes supplied are a good starting point, they’re solid performers, but you can get
real tweaky and spend a fortune on high-
end tubes if you’re so inclined. Or you
may just want to turn it on and listen, like I do.
If you should feel the need to try different tubes be careful to order them with
matched sections or
have them tested (they’re dual triodes, two tubes in one
bottle). Most reputable suppliers can provide tubes with matched sections.
Don’t handle the tubes too much- keep them clean and free from fingerprints;
they’ll stay cooler and last longer. It is good to swap tubes once a year (V1 to V2,
and V3 to V4). This insures that the DC filament current is reversed periodically
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