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In Reply to: The Calypso needs very quiet tubes.. posted by adjieda on April 23, 2007 at 11:23:53:
Calypso does not need extremely quite tubes. In my limited tube rolling experience with it, I have never heard very noisy combination.On its boards, there are a couple jumpers near the 12AX7s which can be selected for 0db gain or -12db gain. Mine was set at -12db gain from the factory. I presumed this is the default setting now. The manual states that with this setting you get a -12db gain but also a -12db less noise. It's worth trying.
Follow Ups:
I don't see anywhere to select the gain on the circuit board and this is not mentioned in the "Preliminary Owners Manual" I have. Thanks
I have the instruction sheet on how to do this, if you need it.
I happen to be on the road. I could post the detail sometimes next week after I'm home so that I can look at the Calypso and its manual.Basically (I am trying to recall these), there are a couple of jumper pads on each of the audio board. It's located left to each 12AX7. Each pads has four position for the jumper.
For 0db setting, two jumpers need to be on top and bottom position. For -12db setting, those same two jumpers need to be placed on the middle position.
If I could describe it with a diagram it would be like this:
For 0db setting:
=== Put a jumper pin here
= = leave this open
= = leave this open
=== Put a jumper pin here
For -12db setting:
= = leave this open
=== Put a jumper pin here
=== Put a jumper pin here
= = leave this openYou need to make this change on each of the audio boards (there are two of them) and make sure the unit is completely turned off not just standby.
My Calypso came with an additional sheets explaining how to change to -12db setting although my unit already setup that way. So I presumed this is the way it's setup at the factory now. Mine has a serial number of 37xx.
I asked Aesthetix about this too before I bought the unit and this is part of their reply: "This can be cured by opening the case, changing 2 internal connections on the circuit board. This sets the Calypso for lower gain & in 99% of cases, eliminates the noise."
Hope this helps. If it still confuses you, let me know and I will look it up once I'm back home.
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