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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 26th October 2015, 05:36 AM   #881
keantoken is offline keantoken  United States
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2SC4793/A1830 work if you don't need the last few hundred mA provided by the original transistors.
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
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Old 26th October 2015, 11:02 AM   #882
marsupialx is offline marsupialx  United States
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Did you mean 2sc4793 / 2SA1837? That I can find. Thanks!!!
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Old 5th November 2015, 03:43 PM   #883
marsupialx is offline marsupialx  United States
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Found 1930e / 5171e Fairchild transistors. Building soon!!!
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Old 5th November 2015, 04:45 PM   #884
keantoken is offline keantoken  United States
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Fairchild doesn't make those AFAIK.
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Old 5th November 2015, 04:50 PM   #885
AndrewT is offline AndrewT  Scotland
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I have the 2sa1930 datasheet and it is Toshiba. That doesn't exclude Fairchild.

The case style is SC-67/2-10R1Aand looks like a fully enclosed type with insulated backplate.
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Old 5th November 2015, 09:00 PM   #886
marsupialx is offline marsupialx  United States
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I was confused. These are the exact parts. It was the other transistors that I got from the same person that were Fairchild. I knew I'd confused y'all, but I didn't have an opportunity to correct my post. Sorry!!!
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Old 6th November 2015, 03:33 PM   #887
alexkosha is offline alexkosha  United States
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Keantoken's CFP cap multiplier
If I may... There are plenty of 2SA1930 in Mouser or DigiKey. And 2SA5171 I acquired from eBay guy. Please see attached picture.Click the image to open in full size.Click the image to open in full size.

I used already 3 of them and seems they are original Toshiba made transistors. No issues what so ever...
I'll send you guys a link to that eBay source.


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Old 6th November 2015, 03:38 PM   #888
alexkosha is offline alexkosha  United States
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Keantoken's CFP cap multiplier
Here it is and relatively cheap:
http://www.ebay.com/ulk/itm/181363181214


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Old 6th November 2015, 07:01 PM   #889
marsupialx is offline marsupialx  United States
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Thank you very much!!! It's so hard to tell if Ebay parts are going to be genuine. It's good to know that those are! Thanks again.
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Old 22nd November 2015, 11:55 AM   #890
rensli is offline rensli  Estonia
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keantoken, i finally had time to test your circuit in real action.

Yesterday, i was modifying the Texas tidu34 volume control. Got it sounding just right with LM317AT+LM337AT. Using Thailand NE5532 and OPA2134 from texas.

Tidu34 controls the volume for naim NAP140 clone amplifier.

The i had an idea to try you K-multiplier:
1. Took a transformer 14VA
2. Built PSU filter with LOW ESR 470uF electrolytes.(CRCRC, R= 330mR)
3. At the last electrolyte from Filter-Bank, installed there k-multiplier.

Output before k-mult = 16V +/- VDC
Output from k.mult = 14V +-/ VDC

While soldering stuff together i was listening to LM regulator PSU.

Cut the power off Tidu34, replaced LM regulator psu with filterbank + k-mult.

Turn on and WoW, everything is sooo different... soundstage/dynamics/acoustic are completely new story lol.... how is it possible

First i tought, its the filter in AC 230V line, today i removed the AC filter, sound is still same

I miss that relay switch to compare between different amps and speakers(and also switch between PSus)... i will get on it and then will tell the difference lol

Last edited by rensli; 22nd November 2015 at 12:04 PM.
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