323 MC Boards Mod
Posted by: fatcat on 18 January 2003
I have 323 MC boards in a NAC62. Does anybody know if they can be modified to work with a MM cartridge.
Fatcat
Fatcat
Posted on: 18 January 2003 by NAIM-Collector
Yes with great difficulty, anything is possible.
The simple solution is to remove the boards and replace them with a pair of 322 [MM] boards.
I think it wouldn't be to difficult to pick up second hand Moving Magnet boards
The cartridge of choice is the Moving Coil type so MM boards should be available for not a lot of money.....
The simple solution is to remove the boards and replace them with a pair of 322 [MM] boards.
I think it wouldn't be to difficult to pick up second hand Moving Magnet boards
The cartridge of choice is the Moving Coil type so MM boards should be available for not a lot of money.....
Posted on: 18 January 2003 by Manu
Mr Naim-Collector,
IMO, Blue electrolytic caps (not the tantalums) on your pic E and MM boards are not originals nor the recommanded replacement. They should be red like on the S board.
They should not be replaced, they sound better and are good for a lifetime.
Fatcat,
MM and MC boards are very different. Find someone willing to exchange.
Emmanuel
All opinions are my own, and reflect those of the organisation i work for, even if not stipulated.
IMO, Blue electrolytic caps (not the tantalums) on your pic E and MM boards are not originals nor the recommanded replacement. They should be red like on the S board.
They should not be replaced, they sound better and are good for a lifetime.
Fatcat,
MM and MC boards are very different. Find someone willing to exchange.
Emmanuel
All opinions are my own, and reflect those of the organisation i work for, even if not stipulated.
Posted on: 19 January 2003 by NAIM-Collector
Manu
Well spotted, I dragged the J-peg somewhere from the Internet but it was included to highlight the difference between the MM and MM phono board versions.
One thing I will disagree with is the comment about the red electrolytic caps "are good for a lifetime".
I have owned NAIM amplifiers for over 25 years and in that time the reliability is outstanding.
There are a couple of exceptions:-
(1) A rectifier diode in a NAP-250 failed.
(2) A NAP-160 went DC and took out the bass unit in my IMF MkIV TLS.
(3) One of those red electrolytic failed in a NAXO - one of the caps started discharging white stuff through cracks in the top.
I guess like all the caps in NAIM equipment they need replacing every ten years.
I don't call ten years a lifetime.....
Well spotted, I dragged the J-peg somewhere from the Internet but it was included to highlight the difference between the MM and MM phono board versions.
One thing I will disagree with is the comment about the red electrolytic caps "are good for a lifetime".
I have owned NAIM amplifiers for over 25 years and in that time the reliability is outstanding.
There are a couple of exceptions:-
(1) A rectifier diode in a NAP-250 failed.
(2) A NAP-160 went DC and took out the bass unit in my IMF MkIV TLS.
(3) One of those red electrolytic failed in a NAXO - one of the caps started discharging white stuff through cracks in the top.
I guess like all the caps in NAIM equipment they need replacing every ten years.
I don't call ten years a lifetime.....
Posted on: 19 January 2003 by fatcat
Thank you both for the information.
Fatcat
Fatcat
Posted on: 20 January 2003 by Justin
Those red caps on the S board do NOT last forever. I've had three fail on me. Out of nowhere, the plastic can has come right off of them. NANA serviced them and they came back with those blue electrolytics shown in the E. New phono boards use these blue electrolytics.
Judd
Judd
Posted on: 20 January 2003 by Manu
Ok, i've been maybe too affirmative concerning those red caps' life.
In fact we don't change them when doing a recap, unless they are dead or nearly dead.
When we have to change them, we are supposed to put blue electrolitics, i prefer to put used tested red ones (at no charge), they sound better on phono boards. But it is quite exceptional we have to change one of them.
52x boards use gold axial caps.
Emmanuel
All opinions are my own, and reflect those of the organisation i work for, even if not stipulated.
In fact we don't change them when doing a recap, unless they are dead or nearly dead.
When we have to change them, we are supposed to put blue electrolitics, i prefer to put used tested red ones (at no charge), they sound better on phono boards. But it is quite exceptional we have to change one of them.
52x boards use gold axial caps.
Emmanuel
All opinions are my own, and reflect those of the organisation i work for, even if not stipulated.