Zesto Audio 2015
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P a g e
11
Grounding
The grounding switch applies to the XLR Balanced input only.
The grounding switch does not affect the RCA Single Ended input.
If you are using the XLR input, start with ground switch up and adjust it for the least amount of noise
Tube Rolling
Important! The wrong type of the tubes can cause considerable damage
.
Your unit
is designed to work safely with any KT88. It will also work with KT120’s, but with auto bias it will not provide
more power, just sound different. Class A design provides plenty of power.
Warning! Do Not use
6550, KT90’s, KT100’s
tubes as they will
NOT
work in this unit. Because they have a lower power
rating, they will cause
DAMAGE
to the power amp and the tubes.
Any damage caused by tube rolling is not
covered by the manufacturer’s warranty
.
Warranty
All Zesto Audio equipment is covered by a 2 year limited warranty for parts and labor to cover defects in materials and
workmanship and 6 month warranty on the original vacuum tubes from date of purchase.
To obtain this original owner warranty the completed warranty registration card must be received at the factory within 15
days from date of purchase. The warranty may be transferable during the 2 year period. Please contact factory to register
new owner.
This warranty is void if the product has not been u
sed in accordance with the instructions found in this owner’s manual, or
if it has been misused, abused, damaged by accident or neglect, or in transport once in possession of purchaser. The
warranty is also void if the product has been tampered with or has been repaired or modified by anyone other than Zesto
Audio or its specifically authorized representatives. This limited warranty only applies to Zesto Audio equipment and
carries no responsibility for any other equipment attached to this unit.
To return the product it must be packed in its original packaging and returned to Zesto Audio or its authorized
representative via insured freight at the owner's expense. Returned products must be accompanied by written description
of the defect and a return authorization number that is available from Zesto Audio or the authorized representative. Upon
receipt of the defective product Zesto Audio or the authorized representative agrees to repair the product without charge
for parts and or labor if within the 2 year warranty period, except for vacuum tubes if the unit is more than 6 months old.
The product will then be returned via prepaid insured freight with a carrier at the sole determination of Zesto Audio or the
authorized representative.
Zesto Audio and its partners reserve the right to modify their products or change specifications at any time without
obligation or liability to previous purchasers.
Warranty will cover ownership outside the USA, but shipping is the sole responsibility of the owner. See your local dealer
for factory approved service in your area.
Factory service on non-warranty items will be billed at an hourly rate to be quoted before work is done.
