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Aleph 4 Strickly DIY Project Build
Aleph 4 Strickly DIY Project Build
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Old 28th June 2011, 05:13 PM   #251
Andy5112405 is offline Andy5112405  United Kingdom
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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.
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Old 28th June 2011, 05:52 PM   #252
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Andy5112405 View Post
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.
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Old 29th June 2011, 05:04 PM   #253
Andy5112405 is offline Andy5112405  United Kingdom
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I'm still waiting for any comments about slowly stirring the air inside the case with a fan.
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Old 29th June 2011, 05:07 PM   #254
Andy5112405 is offline Andy5112405  United Kingdom
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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.
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Old 29th June 2011, 05:09 PM   #255
Andy5112405 is offline Andy5112405  United Kingdom
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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.
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Old 30th June 2011, 08:11 AM   #256
nar is offline nar
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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
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Old 1st July 2011, 04:59 PM   #257
Andy815408 is offline Andy815408  United Kingdom
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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.
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Old 11th October 2011, 09:14 AM   #258
valvesound is offline valvesound  South Africa
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Hi Andy,

Did you solve / found the source of the problem causing the sssssnake in the grassss ssssound? Was it the tantalumssssss?
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Old 18th November 2011, 02:27 PM   #259
KatieandDad is offline KatieandDad  United Kingdom
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This looks good - How did it sound ?
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