Aesthetix Audio Calypso Internal Gain Adjustment User Manual

							
Janus/Calypso 
Internal Gain Adjustment Instructions 
V1.02     2011-5-7
 
The Calypso / Janus is a high gain linestage.  Audio systems with efficient speakers and / or sensitive 
amplifiers may require less gain.  One indication would be a low volume control range, i.e. 0-40 for 
normal listening level.  Another is excessive tube hiss from the Calypso / Janus (referring to the 
linestage section of the Janus).  If there is excessive tube hiss and t\
he volume range is greater than 
40, likely the tubes are the problem and the vacuum tube troubleshooting guide should be consulted.  
If it is determined that a lower gain setting is desirable, the following procedure deta\
ils a –12dB gain 
reduction.  Reducing the gain by 12dB will also reduce tube hiss by 12dB\
. 
 
Procedure:  
1. Disconnect the AC power cord from the Janus or 
Calypso. 
 
2.  Wait a full 20 minutes for the power supply to drain to safe 
levels. 
 
3.  Remove the top cover.  
4. Locate the jumper blocks shown in the diagram at 
right. 
 
5.  There are 2 choices of gain setting: either 0dB or –12dB.  
There are 2 shunts per 
channel. The 2 shunts need 
to be on the outside 
positions for 0dB or on the 2 
inside positions for –12dB. 
Set them both according to 
the requirements. 
 
6.  Repeat the above step for the other channel. 
 
7.  Replace the top cover.