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P a g e
Burn-in
Like all high end audio equipment, this Vacuum Tube Preamp can take
200
hours to
break in
. For circuit testing and quality assurance, Zesto Audio ships
all the Leto Ultra Preamps with at least
50 hours of factory burn-in.
Vacuum Tubes
Important!
First identify the two types of tubes as they are
NOT
INTERCHANGEBLE
. Your input tubes are ECC832 (12DW7) and your output
tubes are ECC82 (12AU7). They are not interchangeable. Please note that
failure to follow this warning can cause considerable damage not covered under
warranty. Plus it will sound terrible and wear out the tubes prematurely.
The sockets are labeled in order to correctly plug in the right tube in the right
socket. Using the glove provided, unpack and carefully plug in,
do not
rock the
tubes that can bend the pins. Make sure they are firmly pushed in all the way in
their sockets. They can only go in one way.
Output
Using RCA or XLR interconnect cables; connect both the left and right outputs to
your power amp.
Input
Using RCA or XLR interconnect cables; connect your sound sources to the
inputs of the preamp.1 thru 3 are Single Ended and inputs 4 thru 6 are Balanced.
Feet
Your unit is installed with four feet using 8-32 screws.
Fuse
This preamp is design only for “Slow Blow” fuses. Do not use a standard fuse.
