Quickie Cathode Bypass Capacitor Value

coca · 1837

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Offline coca

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on: January 02, 2014, 04:52:36 PM
IT SEEMS THAT I HAVE MISSED SOMETHING ON THE FORUM REGARDING THIS CAPACITOR VALUE. ON MY SHEMATIC, IT INDICATES THAT THE VALUE OF THIS CAP IS 1000UF, BUT ON THE QUICKIE 1.1, IT IS 150UF. CAN ANYONE TELL ME WHY THE CHANGE, AND IF THERE IS ANY SONIC DIFFERENCE IN THE TWO VERSIONS OF THE PRE AMPS? THANKS IN ADVANCE,

BERNIE.
« Last Edit: January 02, 2014, 07:16:11 PM by Caucasian Blackplate »


Offline Paul Birkeland

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Reply #1 on: January 02, 2014, 07:17:17 PM
The Quickie was always intended to be built from parts on hand.  The 1,000uF used to be the closest optimal capacitor we had in the inventory.  The 150uF cap became available when we came out with the BeePre, so it has been substituted instead.

(When you type in all caps, it looks like you're yelling)

Paul "PB" Birkeland

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Offline coca

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Reply #2 on: January 02, 2014, 08:50:11 PM
Sorry Paul, just forgot to press the caps key. However, thanks for the explaination. Just curious.

Bernie.


Offline boulos

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Reply #3 on: January 10, 2014, 06:18:06 AM
What would be the ideal specs (capacitance, voltage) for the cathode bypass cap?


Offline Paul Birkeland

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Reply #4 on: January 10, 2014, 09:01:01 AM
PJ's rule of thumb would say that 60uF is a good value, but he has recommended 47uF and bigger.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline boulos

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Reply #5 on: January 10, 2014, 05:36:28 PM
Thanks!  Specifically, would these Panasonics work well here?  http://www.digikey.com/product-detail/en/EEU-FM1V102/P12405-ND/613766
1000uF, 35V, Ripple current: 3.19A, Impedance: 15mOhm, 0.5" diameter, 1" hight.


Offline Paul Birkeland

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Reply #6 on: January 11, 2014, 08:48:57 AM
They would work, but it's hard to say if they would be an improvement over what we provide in the kit, as they are made for a much higher rated voltage, and are 1000uF vs. 150uF.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline boulos

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Reply #7 on: January 12, 2014, 07:21:11 AM
Thanks PB.  I'll just use the ones in the kit then ... I just ordered it :-)


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