Keantoken's CFP cap multiplier - Page 89

keantoken · 26th October 2015, 06:36 AM

2SC4793/A1830 work if you don't need the last few hundred mA provided by the original transistors.

marsupialx · 26th October 2015, 12:02 PM

Did you mean 2sc4793 / 2SA1837? That I can find. Thanks!!!

marsupialx · 5th November 2015, 04:43 PM

Found 1930e / 5171e Fairchild transistors. Building soon!!!

keantoken · 5th November 2015, 05:45 PM

Fairchild doesn't make those AFAIK.

AndrewT · 5th November 2015, 05:50 PM

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.

marsupialx · 5th November 2015, 10:00 PM

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!!!

alexkosha · 6th November 2015, 04:33 PM

If I may... There are plenty of 2SA1930 in Mouser or DigiKey. And 2SA5171 I acquired from eBay guy. Please see attached picture.

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.

Sent from my iPhone using Tapatalk

alexkosha · 6th November 2015, 04:38 PM

Here it is and relatively cheap:
http://www.ebay.com/ulk/itm/181363181214

Sent from my iPhone using Tapatalk

marsupialx · 6th November 2015, 08:01 PM

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.

rensli · 01:04 PM

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

26th October 2015, 06:36 AM	#881
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	2SC4793/A1830 work if you don't need the last few hundred mA provided by the original transistors. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

5th November 2015, 05:45 PM	#884
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	Fairchild doesn't make those AFAIK. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

5th November 2015, 05:50 PM	#885
AndrewT R.I.P. Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

22nd November 2015, 12:55 PM	#890
rensli diyAudio Member Join Date: Jul 2014	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 01:04 PM.

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26th October 2015, 12:02 PM	#882
marsupialx diyAudio Member Join Date: Mar 2004 Location: Kansas City	Did you mean 2sc4793 / 2SA1837? That I can find. Thanks!!!

5th November 2015, 04:43 PM	#883
marsupialx diyAudio Member Join Date: Mar 2004 Location: Kansas City	Found 1930e / 5171e Fairchild transistors. Building soon!!!

5th November 2015, 10:00 PM	#886
marsupialx diyAudio Member Join Date: Mar 2004 Location: Kansas City	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!!!

6th November 2015, 04:33 PM	#887
alexkosha diyAudio Member Join Date: Jul 2013 Location: Boise, Idaho	If I may... There are plenty of 2SA1930 in Mouser or DigiKey. And 2SA5171 I acquired from eBay guy. Please see attached picture. 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. Sent from my iPhone using Tapatalk

6th November 2015, 04:38 PM	#888
alexkosha diyAudio Member Join Date: Jul 2013 Location: Boise, Idaho	Here it is and relatively cheap: http://www.ebay.com/ulk/itm/181363181214 Sent from my iPhone using Tapatalk

6th November 2015, 08:01 PM	#889
marsupialx diyAudio Member Join Date: Mar 2004 Location: Kansas City	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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