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NAD 216 THX - Make it sound better?
NAD 216 THX - Make it sound better?
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Old 8th November 2017, 07:15 PM   #31
Ejje is offline Ejje  Sweden
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Quote:
Originally Posted by spiderman62 View Post
Yes, I did change 6 caps with only 2 big 22 mF each. The improvements are in all frequencies. But it was more audible for me from ~300 Hz to 30 Khz since I drive my speakers with 2 amps. A NAD C272 for the Woofers and 216 THX for the midrange and treble. I have now tested the whole register and an improvement in the lower frequencies are also audible.
I had to make a very simpel wiring from the new cap to just one of the inputs from the old cap.
I could do this since the old 3 caps were connected in paralell. I used 4 wires, but you can also make it with just 3 wires if you conect the 2 caps in serie. Since the power supply delivers + /- 67 Volts.
I think my moded 216 THX sounds better than my C272 now.
Very nice! I will do this when i'm done building my honey badger Thanks for reporting the results! Any luck fixing the first amp?

Last edited by Ejje; 8th November 2017 at 07:23 PM.
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Old 11th November 2017, 03:36 PM   #32
spiderman62 is offline spiderman62  Sweden
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Quote:
Originally Posted by spiderman62 View Post
Yes, I did change 6 caps with only 2 big 22 mF each. The improvements are in all frequencies. But it was more audible for me from ~300 Hz to 30 Khz since I drive my speakers with 2 amps. A NAD C272 for the Woofers and 216 THX for the midrange and treble. I have now tested the whole register and an improvement in the lower frequencies are also audible.
I had to make a very simpel wiring from the new cap to just one of the inputs from the old cap.
I could do this since the old 3 caps were connected in paralell. I used 4 wires, but you can also make it with just 3 wires if you conect the 2 caps in serie. Since the power supply delivers + /- 67 Volts.
I think my moded 216 THX sounds better than my C272 now.
Well, I have been able to isolate the fault to the left channel, but I have not had time to start measure the components.
I attached an image of what it looks like now inside my 316 THX.
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File Type: jpg IMG_20171111_131642.jpg (659.3 KB, 193 views)
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Old 7th December 2017, 05:18 PM   #33
Max Martin is offline Max Martin  Sweden
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Hallå där!
Any reason why you decided to moint them upside down? Have myself a 216 that needs new caps
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Old 7th December 2017, 05:36 PM   #34
spiderman62 is offline spiderman62  Sweden
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Originally Posted by Max Martin View Post
Hallå där!
Any reason why you decided to moint them upside down? Have myself a 216 that needs new caps
Well, it was because it will sound much better due to electrons traveling upside down.
just joking
The main reason is that the caps don't fit on any holes on the PCB. So I decided to glue them. Mechanically speaking the top surface was better to be used due to being flat.
The contacts are also glued for electrical isolation. just in case.
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Old 7th December 2017, 06:31 PM   #35
Max Martin is offline Max Martin  Sweden
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Isn’t possible to drill new holes for the caps then?

Would be possible to put 4x10000uf /80v? Or 4x12000uf?
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Old 7th December 2017, 06:50 PM   #36
spiderman62 is offline spiderman62  Sweden
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Originally Posted by Max Martin View Post
Isn’t possible to drill new holes for the caps then?

Would be possible to put 4x10000uf /80v? Or 4x12000uf?
Tja igen!
Yes, I think is possible, but tricky. Due to the copper tracks on the pcb.
I think you can use 4x10000uf /80v Or 4x12000uf if they have a diameter that fits. It could be better actually. However I tried to find caps that fits, but it was not easy. Good ones were quite expensive and in searching for caps that fits came across these ones mentioned above.
Unfortunattely the original caps are of small diameter (25 mm) so you don't have plenty of space.
Good luck and let us know your findings.
Vi hörs!
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Old 7th December 2017, 06:51 PM   #37
Bill_P is offline Bill_P  United States
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From page 86, Nippon Chemicon catalog E1001Q:

• Provide the following adequate clearance space over the
pressure relief vent of a capacitor to avoid blocking the
correct opening of the pressure relief vent.
 Case diameter  Clearance
φ8(6.3) toφ16mm: 2mm minimum
φ18 toφ35mm: 3mm minimum
φ40 mm and above: 5mm minimum

• Do not locate any wire or circuit pattern over the pressure
relief vent of a capacitor.

• If a capacitor is mounted with its pressure relief vent facing
down on the PC board, provide a ventilation hole in the
board beneath it to let gas escape when the vent opens.

The vent is usually on the top surface of the capacitor. Mounting the capacitor upside down blocks the top surface completely. If a fault causes the capacitor to vent, a violent explosion would be expected if the vent is blocked.
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Old 7th December 2017, 06:57 PM   #38
spiderman62 is offline spiderman62  Sweden
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Quote:
Originally Posted by Bill_P View Post
From page 86, Nippon Chemicon catalog E1001Q:

• Provide the following adequate clearance space over the
pressure relief vent of a capacitor to avoid blocking the
correct opening of the pressure relief vent.
 Case diameter  Clearance
φ8(6.3) toφ16mm: 2mm minimum
φ18 toφ35mm: 3mm minimum
φ40 mm and above: 5mm minimum

• Do not locate any wire or circuit pattern over the pressure
relief vent of a capacitor.

• If a capacitor is mounted with its pressure relief vent facing
down on the PC board, provide a ventilation hole in the
board beneath it to let gas escape when the vent opens.

The vent is usually on the top surface of the capacitor. Mounting the capacitor upside down blocks the top surface completely. If a fault causes the capacitor to vent, a violent explosion would be expected if the vent is blocked.
Thank you for advicing this.
It was something of my concern when I decided to make this changes. And I took the risk.
However I will follow the precautions you mentioned.
Thanks!
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Old 7th December 2017, 09:20 PM   #39
Max Martin is offline Max Martin  Sweden
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Isn’t the caps in 214: 25mm diameter and 216THX: 30mm? Have not got mine yet so can’t measure. Thx for all your answers.

I was thinking grinding down the traces to bare copper, drill new holes if needed and also use 1.5-2.5mm2 solid copper to make the traces a bit bigger where it matters at the same time. Good or bad idea?
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Old 8th December 2017, 07:44 AM   #40
spiderman62 is offline spiderman62  Sweden
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Quote:
Originally Posted by Max Martin View Post
Isn’t the caps in 214: 25mm diameter and 216THX: 30mm? Have not got mine yet so can’t measure. Thx for all your answers.

I was thinking grinding down the traces to bare copper, drill new holes if needed and also use 1.5-2.5mm2 solid copper to make the traces a bit bigger where it matters at the same time. Good or bad idea?
I don't know the size of the caps on 214 THX however I have measure the ones I still have and they are 25 mm diameter. On pictures of 214 THX found online, caps seems to be smaller diameter maybe 20 mm ?.
I think if you are careful, with the traces, you will make it.
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