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21
Reel to Reel / Phono Stages, as Tape headamps?
« Last post by ozmillsy on July 05, 2018, 12:42:22 PM »
Hey guys, I have been doing some reading online.

And I discovered that the general EQ curve for tape head output follows the RIAA standard (which as we all know, is the same standard for vinyl).

The signal off the heads is low, around 1mV or less.    Which is similar to alot of MC cartridges.

I understand the EQ sections in tape machines also have slightly different curves allow for tape speed and IEC/NAB standards.

But,,,, is it crazy to think, that an MC phono stage, could be theoretically used as a tape headamp, to receive the signal directly off the heads of our tape machines?   With perhaps some minor tweaks to get it right?

Anyone played with this before?
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Other DACs / Re: Marantz CD12
« Last post by Tweedle12 on July 05, 2018, 03:53:39 AM »
I first heard a CD12 when I was a student - around 1994/95. I had assembled a decent enough starter system - Marantz CD63, Aura Evolution amp, Linn LP12 and Mission 760i SE speakers and called in to my local Hi-Fi shop. One of the sales guys was around my age and he asked if I had a bit of time as Marantz UK had sent over four new, unused CD players that they found when they were clearing out a store room. He said they were older machines - two CD11LE and two CD12 players. He and I spent a couple of hours listening to these remarkable players through, I think, a high-end AV amp and floorstanding B&W speakers. I was transfixed - I had never heard the like of it before. I remember that the CD12 stood out for me. The sales guy preferred the CD11LE - it was a more modern model, he said.

Anyway, I couldn't find the money to buy one of the CD12 players and had to satisfy myself with the memory of it, but it remained my dream machine.

After I started to work I picked up a secondhand Marantz CD80 and later a CD16, but neither recreated the magical sounds I recalled from my encounter with the CD12. Imagine my amazement when an absolutely mint CD12 was advertised for sale less than 10 miles from where I grew up. It came with all the original packaging, accessories and documentation. Well I am sure you can guess the rest...

Of all my Hi-Fi items I treasure the CD12 the most. It truly is a CD player for life. I am glad that other 'custodians' have similar connections with this fantastic machine.
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Other DACs / Re: Marantz CD12
« Last post by brenden on July 04, 2018, 09:18:37 PM »
Here is a pic of the DA12  dac and caps .
     This was mine and had the same chip as Steve's .
     My 94 mk 2 has    two    8805  single crowns .
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Other DACs / Re: Marantz CD12
« Last post by Tweedle12 on July 04, 2018, 08:02:44 PM »
Steven, I am not sure of the various elements of the KI upgrade, except it involves the installation of a hand picked (by KI by ear) S2 chip, extra power regulation and perhaps modification of the output stage. There are very few details available anywhere, but it is a KI upgraded CD12 that both Ken Kessler and Ken Ishiwata use.
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Other DACs / Re: Marantz CD12
« Last post by stevenvalve on July 04, 2018, 07:18:08 PM »
What is this upgrade. Do you have some info.

did contact Ken Ishiwatta about having the KI upgrade
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Other DACs / Re: Marantz CD12
« Last post by brenden on July 04, 2018, 05:04:50 PM »
My experience  is much  the same as both of  yours.  I was really surprised how close my unmodified cd12 came to my extensively modded  94 mk2 .
      I  am not normally shy to mod even really high end gear but ended up selling to a friend in my circle. .It may come back one day  ,but there was a lot of hand wringing as i packed it up especially  after playing it for a few hours . It was just so right .
    I still wonde what i could have done with it as many of the same mods to the 94 are applicable.
     One thing  the cd 12 has over the other machines  is much better caps  made by Soshin Japan  around the  dac chip. .vastly better than all others. 
   The CD 7  also has top caps around the chip as does the   Marantz  project d1  dac
    My 94 mk2  has Panasonic  pps copper foil caps  which are excellent  but not obtainable any more but I have  aquired some   panasonic pps  aluminium   film foil  for other machine  upgrades .
        If the CD12 wasnt so rare  and collectable  would have modded in a heartbeat.
   
       
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Other DACs / Re: Marantz CD12
« Last post by Tweedle12 on July 04, 2018, 03:51:04 AM »
Hi Steven, my CD12 is completely original. Un did contact Ken Ishiwatta about having the KI upgrade, but the cost was significant. I prefer to mess around with several CD94 / CD94II and keep the CD12 as a reference. The CD12 is still to be surpassed in my system for imaging and beautifully pitched treble. I can only dream what a Studer S2 would add to the mix. I have used one in another player and also highly rated it.
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Other DACs / Re: Marantz CD12
« Last post by stevenvalve on July 03, 2018, 09:03:55 PM »
Steven, lovely machine indeed - what DAC chip was fitted as standard? Mine has a single crown 8805 and I have never seen a double crown as standard, but perhaps late production models benefitted from this?
I do not know if these players ever had S2 chips. Here is a picture of the chip that came out of this player. I also put up a picture of the Studer Double Crown i dropped in, interestingly it too is made in Holland. The Studer is a fabulous sounding chip almost a cross between a 1988 Holland and a Taiwan 1997 chip. The best of both worlds. Have you modified your CD12 if so pictures please.
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Other DACs / Re: Marantz CD12
« Last post by Tweedle12 on July 03, 2018, 08:28:48 AM »
Steven, lovely machine indeed - what DAC chip was fitted as standard? Mine has a single crown 8805 and I have never seen a double crown as standard, but perhaps late production models benefitted from this?
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Other DACs / Re: Marantz CD12
« Last post by stevenvalve on July 02, 2018, 03:56:23 AM »
More pictures of the juicey little toy. The copper inner covers are of cause off because i am trying TDA1541 S2 chips including the A and B chips in the transport. Believe me they also have a big effect on the sound of this player. I ended up using a made for Studer TDA1541A S2 1994 chip. It really annihilated the standard S1 Crown.
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