I'm going thru my Schiit Yggdrasil DAC and replacing the stock WIMA caps in the output section (The anti-imaging filter).
For 2 values, 220pf and 330pf, I replaced the FKP2 WIMAs with AMTRANS copper foil polypropylene film caps of the same value. After a week run in, I thought it improved the overall clarity of the high frequencies and gave a blacker background.
Another value WIMA cap that I intend to replace is 2 pair of 0.1uF@100V MKP2. PCB space is at a premium with 5mm pitch leads and SMD mounted close. The Vishay MKP1837 makes a perfect fit, and has a very good reputation on the internet. So I ordered from Mouser. The new ones arrived and have a black case, and on further researching, found the case has changed material from the blue case polypropylene w/epoxy seal to the black molded polybutylene terephthalate.
Was wondering if there are any opinions if these new manufacture Vishay MKP1837 have the same SQ as the older blue cases versions written and reviewed?
For 2 values, 220pf and 330pf, I replaced the FKP2 WIMAs with AMTRANS copper foil polypropylene film caps of the same value. After a week run in, I thought it improved the overall clarity of the high frequencies and gave a blacker background.
Another value WIMA cap that I intend to replace is 2 pair of 0.1uF@100V MKP2. PCB space is at a premium with 5mm pitch leads and SMD mounted close. The Vishay MKP1837 makes a perfect fit, and has a very good reputation on the internet. So I ordered from Mouser. The new ones arrived and have a black case, and on further researching, found the case has changed material from the blue case polypropylene w/epoxy seal to the black molded polybutylene terephthalate.
Was wondering if there are any opinions if these new manufacture Vishay MKP1837 have the same SQ as the older blue cases versions written and reviewed?
I'm a little bit confused. Do the Amtrans AMCH really have copper foils? Parts Connexxion and HiFi-Collective say nothing about it. No other Amtrans will fit in place of a FKP.
Why do you think a MKP1837 should be better than a MKP2?
P.
Why do you think a MKP1837 should be better than a MKP2?
P.
Last edited:
For info on AMTRANS, look to the source: AMTRANS Products Information AMCH
As for opinions on the Vishay MKP1837, here are several of the many capacitor comparisons on the 'net:
Humble Homemade Hifi - Cap Test
Capacitor Musings Article By Jon L DIY Audio Kits Reviews
Audiophile Musings: The Vishay MKP 1837 Review and Modification
Also, measurements on the Blowtorch thread show distortion and noise of the MKP1837 equivalent to polystyrene film and foil.
I know WIMA MKP2 are lacking the last bit of resolution needed in a highly resolving system. First experienced that years ago by replacing the stock WIMA MKP2 caps in an Altmann Attraction DAC with REL Teflons. IMHO, WIMA MKP2 are a weak link.
As for opinions on the Vishay MKP1837, here are several of the many capacitor comparisons on the 'net:
Humble Homemade Hifi - Cap Test
Capacitor Musings Article By Jon L DIY Audio Kits Reviews
Audiophile Musings: The Vishay MKP 1837 Review and Modification
Also, measurements on the Blowtorch thread show distortion and noise of the MKP1837 equivalent to polystyrene film and foil.
I know WIMA MKP2 are lacking the last bit of resolution needed in a highly resolving system. First experienced that years ago by replacing the stock WIMA MKP2 caps in an Altmann Attraction DAC with REL Teflons. IMHO, WIMA MKP2 are a weak link.
Last edited:
And why not the AMCH, they are avaible in 100nF?
P.
PS: Forget the BS from these links (not the Blowtorch!)
P.
PS: Forget the BS from these links (not the Blowtorch!)
Last edited:
Can you kindly provide a link for me to purchase those 100nF AMTRANS AMCH? I have previously searched and even tried contacting the company directly and came up empty.
Agreed, there is a lot of BS on the internet.
Agreed, there is a lot of BS on the internet.
I can see the listing for that value on the Japanese website.
Have not been able find them for sale from their International distributors. So far it's vaporware.
Thought you might have an actual resource available unknown to me.
Have not been able find them for sale from their International distributors. So far it's vaporware.
Thought you might have an actual resource available unknown to me.
Sorry, no.
The original ERO MKP1837 are blue , after Vishay bought ERO the cases get grey. Black ones I never saw.
P.
I bought some of those after reading all that, sounded bright and harsh in decoupling some fairly hi esr electrolytic capacitors in an op amp supply.
Not sure about coupling, could be fine there, since that was the premise of the test I had read.
Maybe some polystyrene in your filter would be good?
I am using the same wima in those applications with no complaints...
Not sure about coupling, could be fine there, since that was the premise of the test I had read.
Maybe some polystyrene in your filter would be good?
I am using the same wima in those applications with no complaints...
Thanks for the polystyrene suggestion, Phase. The 0.1uF value is not available in the lower voltages/smaller packages from quality suppliers. The MIT and RELs are 400-630V and are huge. I'll pass on the EBay/Chinese sourced parts.
Today, I've replaced the WIMA MKP2s in my Yggy with the new production black Vishay MKP1837s I bought from Mouser. Tipped the sonic balance towards the HF and a bit edgy/tizzy. Will play them in for several days and hope they settle some. In the mean time, will inquire with Parts Connexion if their supply of MKP1837s are blue case NOS. If they are, will get two pair and swap out the black ones and compare.
Will report back with what I find.
Today, I've replaced the WIMA MKP2s in my Yggy with the new production black Vishay MKP1837s I bought from Mouser. Tipped the sonic balance towards the HF and a bit edgy/tizzy. Will play them in for several days and hope they settle some. In the mean time, will inquire with Parts Connexion if their supply of MKP1837s are blue case NOS. If they are, will get two pair and swap out the black ones and compare.
Will report back with what I find.
For coupling and decoupling I find SMR-Caps make a great job (http://www.kemet.com/Lists/ProductCatalog/Attachments/325/KEM_F3072_SMR.pdf). I got this advice from Allen Wright (R.I.P.).
P.
P.
In my opinion, the older caps in blue case were better when listening to blues. The synergy between the music and the capacitor case color was nothing but obvious.
1837 @ PcX
I recently picked up some 1837s from PcX, they were the black case versions... (.1 uF). Have not used any yet.
I recently picked up some 1837s from PcX, they were the black case versions... (.1 uF). Have not used any yet.
So, back now after several months run in of new manufacture black case Vishay MKP1837 caps in my Yggdrasil, I replaced them with same value NOS blue case ERO KP1837 caps. An annoying HF coarseness was removed. YMMV
Which positions?
Are you talking about power supply decoupling caps, or analog stage reconstruction filter caps? And what were the OE caps?
Are you talking about power supply decoupling caps, or analog stage reconstruction filter caps? And what were the OE caps?
Capacitors are in the anti-imaging filter. The original ones in that position were were WIMA MKP2 metalized film.
thanks
I like Amtrans film foil caps in those positions. Also REL polystyrene "RTE" if total transparency is desired.
I like Amtrans film foil caps in those positions. Also REL polystyrene "RTE" if total transparency is desired.
I had already swapped out AMTRANS polypropylene film and copper foil for the stock WIMA FKP capacitors in the 220pf and 330pf locations. I like 'em. Might try some ERO KP1834 polystyrene film and tin foil caps someday day. NOS are lots cheaper than new REL.
The KP1837 I wrote of are MKP, as I could not find a film and foil in 0.1uf value that fit the 5.08mm lead spacing and the limited PCB real estate.
The KP1837 I wrote of are MKP, as I could not find a film and foil in 0.1uf value that fit the 5.08mm lead spacing and the limited PCB real estate.
- Status
- Not open for further replies.