Aleph 4 Strickly DIY Project Build - Page 26

Andy5112405 · 28th June 2011, 05:13 PM

I'm wondering wether or not to place a slow running (almost silent) fan inside the case just to stir the air around a bit.

jacco vermeulen · 28th June 2011, 05:52 PM

Quote:

Originally Posted by Andy5112405

How big should the holes be ?

Makes zero difference for these diameters with natural air flow, all that counts is the total hole area.
Big holes always have the advantage of more area/airflow for the same diameter total and having to drill fewer.

Andy5112405 · 29th June 2011, 05:04 PM

I'm still waiting for any comments about slowly stirring the air inside the case with a fan.

Andy5112405 · 29th June 2011, 05:07 PM

After comments about the mounting arrangements of the chokes in the CLCC filter circuits. I'm now waitng on M8 nylon components to replace the steel ones.

There were some quite heavy magnetic fields around the steel mounting bolts.

Andy5112405 · 29th June 2011, 05:09 PM

I've also tied both R Hand and L Hand channel 0V to Mains Ground with 12 Ohm 10W resistors as recommended.

Once it is back together I will report on the changes that have been made.

nar · 30th June 2011, 08:11 AM

Fan : Use an internal fan running slowly and check inside ambient air temp. 35°C is a max if you want to hold the capacitor bank long life. For the speed, your mileage may vary. Try & Error is also part of DIY's routines

Chokes : Yes, better "air core" 200%

1 - 2 mH should be sufficient in a CLCC filter dimensioned as yours. The more wire, the more inductant; but internal R also rises, so gives stronger dissipation factor, extra heat, and you loose some V+/V-olts inside.

Resistors : That should prevent any ground "damage", they could also achieve quieter operation. Anyway, it provides an audio ground connection without creating a ground loop, at least

Happy diy,

nAr

Andy815408 · 1st July 2011, 04:59 PM

Andy, Thanks for popping around this afternoon.

I've got it cracked now. Those tants were awful.

I think you will agree, we have now got the sound that Nelson was aiming for.

valvesound · 11th October 2011, 09:14 AM

Hi Andy,

Did you solve / found the source of the problem causing the sssssnake in the grassss ssssound? Was it the tantalumssssss?

KatieandDad · 18th November 2011, 02:27 PM

This looks good - How did it sound ?

30th June 2011, 08:11 AM	#256
nar diyAudio Member Join Date: Apr 2002 Location: near the sea	Fan : Use an internal fan running slowly and check inside ambient air temp. 35°C is a max if you want to hold the capacitor bank long life. For the speed, your mileage may vary. Try & Error is also part of DIY's routines Chokes : Yes, better "air core" 200% 1 - 2 mH should be sufficient in a CLCC filter dimensioned as yours. The more wire, the more inductant; but internal R also rises, so gives stronger dissipation factor, extra heat, and you loose some V+/V-olts inside. Resistors : That should prevent any ground "damage", they could also achieve quieter operation. Anyway, it provides an audio ground connection without creating a ground loop, at least Happy diy, nAr __________________ "... Audio needs the thinnest wire ..." Rowan McCombe "Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright

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28th June 2011, 05:13 PM	#251
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	I'm wondering wether or not to place a slow running (almost silent) fan inside the case just to stir the air around a bit.

29th June 2011, 05:04 PM	#253
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	I'm still waiting for any comments about slowly stirring the air inside the case with a fan.

29th June 2011, 05:07 PM	#254
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	After comments about the mounting arrangements of the chokes in the CLCC filter circuits. I'm now waitng on M8 nylon components to replace the steel ones. There were some quite heavy magnetic fields around the steel mounting bolts.

29th June 2011, 05:09 PM	#255
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	I've also tied both R Hand and L Hand channel 0V to Mains Ground with 12 Ohm 10W resistors as recommended. Once it is back together I will report on the changes that have been made.

1st July 2011, 04:59 PM	#257
Andy815408 Banned Join Date: Jul 2011	Andy, Thanks for popping around this afternoon. I've got it cracked now. Those tants were awful. I think you will agree, we have now got the sound that Nelson was aiming for.

11th October 2011, 09:14 AM	#258
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	Hi Andy, Did you solve / found the source of the problem causing the sssssnake in the grassss ssssound? Was it the tantalumssssss?

18th November 2011, 02:27 PM	#259
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	This looks good - How did it sound ?

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