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In Reply to: RE: 6SN-7's posted by throwback on December 28, 2014 at 07:18:11
It has a CCS, driver tube and three tubes in the voltage amplifier.One is at the top of the differential cascode and the other two are the bottom of that circuit and in parallel.
Its the bottom tubes that are most important to the sound, followed by the top tube in the differential cascode.
There was a convention established in the M-60 and we have kept with that in the MA-1. So:
V1a and V1b are the bottom of the differential cascode and are the input tubes.
V2 is the top of the differential cascode. V3 is the Constant Current Source, V4 is the driver tube.For MA-1s with the longer chassis, the order is, starting from the corner of the amp facing the power supply: V3, V1a, V1b, V2 and V4 is in the corner facing the power tubes.
For MA-1 MkIII chassis (17" wide with rounded front corners)
the tubes in the rear are V1a and V1b, the tubes in the middle are V2 and V3; V2 being on the left. V4 is in the front.
Note: V4 should be a -GTA or -GTB if using NOS types.
Edits: 01/02/15Follow Ups:
Ralph,
What does the V3 CCS tube become, when the longer chassis silver edition is updated to MK3.3 status? Part of the top of the differential cascode, V2 a or V2b?
Received an used MA-1 silver edition MK3.3 yesterday, trying to figure out each driver tube function. (Believe Chuck was the previous owner).
My understanding of 6SN7 driver tubes layout is (facing amp): left most near power tubes is V4 driver, right to V4 is V2, right to V2 are V1a/V1b running, right most near power supply is V3. There is solid state CCS in MK3.3.
The MA-1s drive Quad 989 beautifully, much better than M60. Much more gain (25db vs 20db), and control.
Thank you
Thanks, Ralph. That helps.
Mr.Karsten
First of all Happy New Year for You ,for your great Manufacture and for Everybody else on this cool OTL Asylum forum .
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And I have one friendly suggestion for future Atma-Sphere OTL amps production ,
any tube on amps chassis need to have `old school` stamped sign beside to associated tube socket ,
for example V1 stamp for sonically most sensitive tube of input diff.voltage amp , V2 stamp for upper cascode tube , V3 stamp for associated CCS tube , V4 stamp for driver tube , V5 for..,V6 for.., and so on , depending from particular Amps model, function and numbers of tubes ,
I think that in this way with stamped lettering on amps chassis altogether with associated customer clear operational manual customers can have easy orientation when they want to experiment with different tube brands for Atma-Sphere based audio gear .
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"Art which does not have the appearance of art is true art."
- Old Roman saying -
Happy New Year to you, too.
I wonder what you think about using CCSs in circlotron. See my thread below. Have you thought about it or tried it? Thanks.
Many Thanks and Happy New Year to you, too!
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And yes I will give mine thinking about CCS in circlotron but on that thread from below .
__
"Art which does not have the appearance of art is true art."
- Old Roman saying -
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