Gervais Cote
Predator
No issues at all to go with higher voltage as long as ESR is about the same.
DIY Naim NAC 72/ 82 Recap - Capacitors
- Thread starter Van
- Start date
colasblue
pfm Member
Well they certainly sell the Nichicon KZ range which will be fine for the decoupling caps in the 72. Going over original rated voltage is fine so 50V or 63V are sensible choices.
https://uk.farnell.com/nichicon/ukz1h470mpm1td/cap-47-f-50v-20/dp/2841909
They don't sell Elna Silmic II's which are some people's preferred choice for the feedback caps. You can get those from HiFi collective if you wish to try them. You only need two.
I think your 72 BoM might be a bit light even if you have a minimal complement of boards. I'd double check it before ordering.
https://uk.farnell.com/nichicon/ukz1h470mpm1td/cap-47-f-50v-20/dp/2841909
They don't sell Elna Silmic II's which are some people's preferred choice for the feedback caps. You can get those from HiFi collective if you wish to try them. You only need two.
I think your 72 BoM might be a bit light even if you have a minimal complement of boards. I'd double check it before ordering.
Thanks would it be this? https://www.hificollective.co.uk/ca...lna-silmic-electrolytic-capacitor-p-4349.html
colasblue
pfm Member
Yes that's it.
HFC are also quite a bit cheaper on the KZ's so if you're going to place an order you may as well also buy the KZ's there.
Just remembered that if your 72 also has phono boards you need an additional silmic per MC board and two per MM board.
If you aren't comfortable in your ability to identify which caps are decouplers and which are feedback you could just use either sort of cap for everything. If you use exclusively Silmics it will work very well but you'll need a couple of weeks "run in" to get the best performance. In the past this was my approach since KZ's have only become available relatively recently and thr Oscons which used to be favoured for decoupling became unavailable.
I can't say how well it would work if you use exclusively KZ's but the fact that Witch Hat didn't probably tells you something.
I currently have two 82's, one of which I recapped 20+ years ago with Silmics for decoupling and Evox Rifa film caps for feedback (previously it had Silmics all round and I don't think the Rifa feedback caps addded much) and a fully superlinked one which Witch Hat did in 2019 which uses KZ's for decoupling and Silmics for feedback.
They're both pots 8, final board revisions and actually within a few months of each other in serial numbers. The only other differences are that my original has also had its pots replaced and the Superlinked one hasn't and my original has Clare relays and the Superlinked one has something else
In four rail mode they don't actually sound much different even though the superlinked one also benefits from extra decoupling in the input buffer.
I guess what I'm saying here is Silmics all round is a very good option and will last for a very long time.
HFC are also quite a bit cheaper on the KZ's so if you're going to place an order you may as well also buy the KZ's there.
Just remembered that if your 72 also has phono boards you need an additional silmic per MC board and two per MM board.
If you aren't comfortable in your ability to identify which caps are decouplers and which are feedback you could just use either sort of cap for everything. If you use exclusively Silmics it will work very well but you'll need a couple of weeks "run in" to get the best performance. In the past this was my approach since KZ's have only become available relatively recently and thr Oscons which used to be favoured for decoupling became unavailable.
I can't say how well it would work if you use exclusively KZ's but the fact that Witch Hat didn't probably tells you something.
I currently have two 82's, one of which I recapped 20+ years ago with Silmics for decoupling and Evox Rifa film caps for feedback (previously it had Silmics all round and I don't think the Rifa feedback caps addded much) and a fully superlinked one which Witch Hat did in 2019 which uses KZ's for decoupling and Silmics for feedback.
They're both pots 8, final board revisions and actually within a few months of each other in serial numbers. The only other differences are that my original has also had its pots replaced and the Superlinked one hasn't and my original has Clare relays and the Superlinked one has something else
In four rail mode they don't actually sound much different even though the superlinked one also benefits from extra decoupling in the input buffer.
I guess what I'm saying here is Silmics all round is a very good option and will last for a very long time.
muchtoofast
pfm Member
2023-10-09_02-01-07 by muchtoofast, on FlickrJust back this week from Naim Factory after first service... so this is what they used.
muchtoofast
pfm Member
2023-10-09_02-34-23 by muchtoofast, on FlickrThis was taken before the service. Standard stock original untouched unit.
Hope it helps.
Looks like they have used their bog standard (meaning they use them in everything) Samwha SG's for all the decoupling and SIF-SAFCO's for the axials (very hard to get unless you are trade and order loads). Tants look AVX or more likely Kemet but without a close up....
Just back this week from Naim Factory after first service... so this is what they used.
Samwha are available from Cricklewood Electronics amongst others and are cheap. Says something.......
martin clark
pinko bodger
Samwha is Nichicon's South Korea factory - same QC, and absolutely nothing wrong with them, at all.
muchtoofast
pfm Member
Thanks for the info all. Also good to know about Samwha QC. Was just offering the pictures as a possible reference to DIY servicing. Interesting that they seemingly didn't replace the two blue caps on the main horizontal PCB.
colasblue
pfm Member
You may also need the 4 x 10V zener if it's a really old one or you just got unlucky and they went noisy. They cost peanuts anyway so just as well to change.
Look at the 135 servicing thread in reference - the BoM is pretty much the same except you need two less reservoir caps and don't need the fan board components (factory spec is the last entry).
The brands I used are still holding up well (14 years later on two of my three pairs) but they certainly aren't the only good choices.
Look at the 135 servicing thread in reference - the BoM is pretty much the same except you need two less reservoir caps and don't need the fan board components (factory spec is the last entry).
The brands I used are still holding up well (14 years later on two of my three pairs) but they certainly aren't the only good choices.
colasblue
pfm Member
Link
pinkfishmedia.net
Unless JJ is selling them I don't think there is a UK source of Kendeil caps anymore. There is a Turkish Ebay seller but his prices are certainly on the high side so I don't think I'll be going there when the time comes. He's also selling 4 year old stock which would put me off slightly.
You can get the actual felsic caps Naim use much more reasonably.
https://www.ebay.co.uk/itm/13463406...pid=5338728743&customid=&toolid=10001&mkevt=1
I think I'd be inclined to go with one of the 22000uf Kemet offerings these days, either the 22000uF ALS40 (formerly BHC) or the PEH200 series (formerly Evox Rifa) or at a pinch the 15000uF ALS30, but before diving in I'd probably get an old 250 to service and try out a pair in that first.
for the 47uF caps on the regs boards Elna Silmic II's can be obtained from HIFIcollective as can the Nichicon Muze KZ if you prefer that. Neiljadman seemed to favour the green Nichicon Muze KZ bipolar cap for the 47uF on the regs board and it might well be a good choice but wasn't available to me 14 years ago.
The 47uF Vishay 031 AS series also works if you must have axial caps.
The 10uF panasonic NHG series is very widely available and again if you want to stick with Axial the 10uF Vishay 031 AS series is fine.
Naim Nap 135 Servicing thread
Ok here it is – the long awaited Naim Nap135 servicing thread. The warning part: In order to properly service a power amplifier you will need to have it fully powered up some of the time with the covers off and test equipment connected. Unless you are 100% confident that you are fully...
pinkfishmedia.net
Unless JJ is selling them I don't think there is a UK source of Kendeil caps anymore. There is a Turkish Ebay seller but his prices are certainly on the high side so I don't think I'll be going there when the time comes. He's also selling 4 year old stock which would put me off slightly.
4pcs NEW KENDEIL K01 22000UF 63V CAP AUDIO QUAD303 QUAD 405 UPGRADE NAIM! | eBay
AUDIO QUAD303 QUAD 405 UPGRADE NAIM AMP ! Kendeil capacitors are only "MAde in Italy" not China. Kendeil S.r.l. They can be preferred slightly over the BC 114 series as they are smoother and they can be had cheaper.
www.ebay.co.uk
You can get the actual felsic caps Naim use much more reasonably.
https://www.ebay.co.uk/itm/13463406...pid=5338728743&customid=&toolid=10001&mkevt=1
I think I'd be inclined to go with one of the 22000uf Kemet offerings these days, either the 22000uF ALS40 (formerly BHC) or the PEH200 series (formerly Evox Rifa) or at a pinch the 15000uF ALS30, but before diving in I'd probably get an old 250 to service and try out a pair in that first.
for the 47uF caps on the regs boards Elna Silmic II's can be obtained from HIFIcollective as can the Nichicon Muze KZ if you prefer that. Neiljadman seemed to favour the green Nichicon Muze KZ bipolar cap for the 47uF on the regs board and it might well be a good choice but wasn't available to me 14 years ago.
The 47uF Vishay 031 AS series also works if you must have axial caps.
The 10uF panasonic NHG series is very widely available and again if you want to stick with Axial the 10uF Vishay 031 AS series is fine.
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