Chime Gold Vacuum Tube USB DAC
5
Replacing Tubes
Upgrading the vacuum tubes to quality NOS can have a positive impact on
sonics. The first tube (left side) is a 12AX7 type high-gain tube. You can also
use a 5751. Second tube is a cathode follower output buffer and is a 12AU7
(5814A, 6067). High voltage rectification is provided by a 5Y3GT, but many other
8-pin types will also work (GZ34, 5AR4, etc.). Always unplug power cord before
removing the top cover.
The fuse is located on the circuit board under the transformer wires. It is a 1 amp
“slo-blo” 5x20 type.
