Both cards are interchangeable. However, you should pick one type as reference Line Output cards and match the other type by adjusting the pot on the front of the card. You could play a tape with a 1 khz test tone (or a signal generator) and mark where your VU meter needles are (should be at 0VU if A820 is calibrated to +4dB normal operating level) with your reference line output cards. Then power off first before replacing the cards with another type, turn the pots while playing same test tone to get your VU meters to be the same. That's all.
Both cards are interchangeable. However, you should pick one type as reference Line Output cards and match the other type by adjusting the pot on the front of the card. You could play a tape with a 1 khz test tone (or a signal generator) and mark where your VU meter needles are (should be at 0VU if A820 is calibrated to +4dB normal operating level) with your reference line output cards. Then power off first before replacing the cards with another type, turn the pots while playing same test tone to get your VU meters to be the same. That's all.
John for doing some "indepedent" measurements and Mike for the "sonic impressions" - please let us know what you hear as the caps break (brake?) in.
Just finished my weekend job which was to put the Mundorf's in two preamps one of my customers sent back for updating. Realized when looking inside that these were older ones without the output cap bypass; so did that too. Keith, you should be in for a treat - please let us know what you think. And I'll do the same on your third preamp.
John, thanks for the tip to also remove the the other paralleled caps when putting in the Mundorf. Of course a paralleled "inferior" cap could certainly "smear" the sound.
There has been much discussion on the internet about Mundorf and break in of capacitors.
I found this email between Mr. Filke of Mundorf & a customer.
These hour figures generally mean the caps smooth out and gain air and reach there near optimum
level.It has been my experience these levels are correct and they continue to improve afterwards subtly.
Below Mr. Mirko doesn't mention the Silver/Gold/Oil as they were added to the product line at a later date.
I would say it would be the same as the Silver/Oil @ 240 Hours.
"Here is an email from Mr. Mirko Filke - Export Manager of MUNDORF EB GMBH regarding the burn-in of Mundorf Caps. I hope this will clear-up everything with regards to burn-in period of Mundorf Caps"
i've been running a signal thru the Mundorf Supreme's for about 100 hours so far. last night i played a couple tapes thru the Studer King Cello w/Mundorf -> dart pre and compared it to my ATR-102 'naked' into the dart pre. the KC-Mundorf sounded veiled and muted. the Ampex open and vivid....which was how the KC-Studer sounded prior to the Mundorf's.
i'm removing the Muindorf's (or rather i'm having Ki remove them). in my particular system, to my particular ears, they are not the ticket. another 100 hours cannot/will not change thngs that much.
anyone need a couple of Mundorf Supremes 1.0 mdf Silver/Gold/Oil? very lightly used.....
i've been running a signal thru the Mundorf Supreme's for about 100 hours so far. last night i played a couple tapes thru the Studer King Cello w/Mundorf -> dart pre and compared it to my ATR-102 'naked' into the dart pre. the KC-Mundorf sounded veiled and muted. the Ampex open and vivid....which was how the KC-Studer sounded prior to the Mundorf's.
i'm removing the Muindorf's (or rather i'm having Ki remove them). in my particular system, to my particular ears, they are not the ticket. another 100 hours cannot/will not change thngs that much.
anyone need a couple of Mundorf Supremes 1.0 mdf Silver/Gold/Oil? very lightly used.....
I really wondered how a 1uf cap used as a bypass would make any difference on a 470uf e-cap. If I could find them I would replace the 470uf capacitor with a Black Gate 470uf 100V N/NX series cap and watch your jaw drop.
These are not the N/NX series but they are better than anything else made now or since. The std blackgate are rated at about 75/100,most caps are 30-40/100,the N/NX are 100/100 and the FK series are rated at -160db down. The N/NX put in e series are 120/100
i've been running a signal thru the Mundorf Supreme's for about 100 hours so far. last night i played a couple tapes thru the Studer King Cello w/Mundorf -> dart pre and compared it to my ATR-102 'naked' into the dart pre. the KC-Mundorf sounded veiled and muted. the Ampex open and vivid....which was how the KC-Studer sounded prior to the Mundorf's.
i'm removing the Muindorf's (or rather i'm having Ki remove them). in my particular system, to my particular ears, they are not the ticket. another 100 hours cannot/will not change thngs that much.
anyone need a couple of Mundorf Supremes 1.0 mdf Silver/Gold/Oil? very lightly used.....
So still no cap is the best cap, if still need something in there , try a silver in-put transformer 1 to 1 ratio with Nickel core, Kondo of Audio Note said better put more silver as you can to your system but the silver's price jumped too high now that makes those silver audio products out of business
tony ma
So still no cap is the best cap, if still need something in there , try a silver in-put transformer 1 to 1 ratio with Nickel core, Kondo of Audio Note said better put more silver as you can to your system but the silver's price jumped too high now that makes those silver audio products out of business
tony ma
But I think in this instance the bypassing would actually degrade the sound. I agree no cap is best but if the application calls for a capacitor and it is in the signal path,at 470uf the only "real" choice is a Blackgate N series for sonic gains.
But I think in this instance the bypassing would actually degrade the sound. I agree no cap is best but if the application calls for a capacitor and it is in the signal path,at 470uf the only "real" choice is a Blackgate N series for sonic gains.
I used a lot of Black Gate cap but most in power supply till it out of market (KWZ type) in amp only in cathode by pass ( N series) in sound path I prefer transformer, that why I like tube amp better because it don't need in-put block, in the K/C case you still can use a in-put transformer to replace that 470 uf cap but the only thing you have to do is match the impedance of the repro head, when it matched you will get the most advantages , how to match, find out the repro head's impedance and custom order make a 1 to 1 ratio with same impedance transformer, maybe this modification is not a simple one but will have big difference in return
tony ma
Fwiw,there was a question about burn-in on Mundorf caps. my Ampex 350's have mostly Mundorf M series e-caps,M supremes,and Silver & oils in them. After about 340 hours logged they are finally opening up. This is not unusual for boutique capacitors and can be frustrating as at first you think that after so much time it can't possibly change that much. But again I am talking about 28 caps here and not just one or a few.
Fwiw,there was a question about burn-in on Mundorf caps. my Ampex 350's have mostly Mundorf M series e-caps,M supremes,and Silver & oils in them. After about 340 hours logged they are finally opening up. This is not unusual for boutique capacitors and can be frustrating as at first you think that after so much time it can't possibly change that much. But again I am talking about 28 caps here and not just one or a few.
the Mundorf's are now removed and the original caps are back in place. and all is well sonically. thanks Ki, for you help.
it's actually better than before since i got an Adona rack to replace the $20 plant stand i had the King Cello on......and the solid grounded Adona, combined with the Wave Kinetics A10 U8 isolation footers underneath, and the Walker lead filled pucks on top, is taking things a bit further in terms of focus and clarity. i was using the A10 U8's and pucks before, but the plant stand was not solid so the effects were marginal.
I'm getting to know the deck little by little 
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