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Old 31st August 2010, 11:26 PM   #41
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Quote:
Originally Posted by jpak View Post
Thanks Allen. The input impedance on the power amps would be 100k. As for cable length I would need roughly 20-25 feet for my planned listening room
No problem, as long as it's lowish capacitance. I would suggest 3 very thin wires, twisted. If used balanced it will be humm pickup free, if unbalanced then use two wires for earth, but only ONE of then connected at both ends.

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Old 1st September 2010, 12:21 AM   #42
jpak is offline jpak  United States
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My experience is limited with step up transformers, other than a long term loan with Cinemags. I too prefer the sound of active devices to the SUT.
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Old 23rd June 2011, 06:01 AM   #43
cjcc67 is offline cjcc67  Australia
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I'm about to start assembling the phono stage.
I intended to use some MAT02AH for the input.
Not being familiar with their usage of CCS's am i looking for a device that will deliver a constant 19mA at negative 25V.
What has successfully been used in this location?
thanks
Craig
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Old 23rd June 2011, 10:36 AM   #44
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I think he used FETs, but a high-gain BJT cascode (with red led) should work too I guess.
(Arhus Triode Festival 2002)

Try googling for low noise CCS, or search on this board.
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Old 23rd June 2011, 11:22 AM   #45
Alex M is offline Alex M  United Kingdom
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Quote:
Originally Posted by cjcc67 View Post
I'm about to start assembling the phono stage.
I intended to use some MAT02AH for the input.
Not being familiar with their usage of CCS's am i looking for a device that will deliver a constant 19mA at negative 25V.
What has successfully been used in this location?
thanks
Craig
You have PM.

Alex
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Old 23rd June 2011, 05:24 PM   #46
Jaap is offline Jaap  Netherlands
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Quote:
Originally Posted by cjcc67 View Post
I'm about to start assembling the phono stage.
I intended to use some MAT02AH for the input.
Not being familiar with their usage of CCS's am i looking for a device that will deliver a constant 19mA at negative 25V.
What has successfully been used in this location?
thanks
Craig
I have matched 2sk369 for sale. PM me if you want some
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Old 7th July 2011, 12:09 PM   #47
cjcc67 is offline cjcc67  Australia
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So far I've tracked down most of the components and will start with the ccs next week. I'm not sure what to use for the RIAA caps. Any suggestions?
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Old 7th July 2011, 12:48 PM   #48
Alex M is offline Alex M  United Kingdom
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I gather that Allen was until recently using Wima FKP2 polypropylene film and foil caps for the phono EQ. I don't know whether that was mainly because of their ready availability and low price, but I would guess that he found them at least acceptable for the purpose.

Here is a comment of his on the subject.

Alex
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Old 7th July 2011, 06:38 PM   #49
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Don't get too obsessive about it, any decent PP, PS or SM caps will do.
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Old 7th July 2011, 09:44 PM   #50
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by jpak View Post
My experience is limited with step up transformers, other than a long term loan with Cinemags. I too prefer the sound of active devices to the SUT.
Just a slightly OT comment as I own several different sets of SUTs and have to mention that while very good for the money the Cinemag is hardly representative of the performance achievable in a SUT. The Partridge 972, 977 and several Lundahl types will run circles around it. (There are lots of others at progressively higher prices that are even better.)
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