Zesto Audio Andros Tessera Phonostage, Owner'S Manual

Page: 15 / 16

Zesto Audio 2021 Page #15
MM Load Adjustments

Starts with 47K Ohms on the switch then try the 68K Ohms.
The Gain Switch

The three-position switch on the front sets the gain

Adjust the gain to Low for a high output cartridge, mid for a mid-output cartridge and High for Low output
cartridges.

MC input gain is 65dB, 70dB and 75dB

MM input gain is 47dB, 51dB and 55dB
Volume

If the volume is louder on one channel then the other, you may want to try switching the tubes around
with the main unit Turned Off and Power supply on Standby. Use the white glove provided and
switch tubes, Note: there are 3 different tubes installed 12AX7s, 12DW7s and 12AU7s, these are not
interchangeable .
Tube Rolling (The Sport of Audiophile Kings)

The unit is designed around the JJ ECC83s because they are neutral, consistent and are high
gain/low noise.

We also use JJ ECC82s.

If your tastes are warmer, you may want to try Mullard’s and if you like it brighter try GE.

We cannot recommend any specific NOS tubes, as no 2 are the same. We prefer to encourage
personal taste, trusting your ears and enjoying the sport.

Any damage caused by tube rolling will not be covered under the warranty.
Tube Rush Noise

If you are hearing this noise, it is most likely a gain setting is too high on the input of the Line Amp.
Leaving the equipment on

Once your Phonostage is burned in properly, it is recommended to not to leave the unit on all the time
which could wear out the tubes prematurely.

These signal Tubes last approximately 1000 to 2000 hours.