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Old 11th February 2013, 12:49 AM   #201
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Not saying the AMR sounded bad, in fact when we started it was a CAL CL-15 (PCM1702/PMD100) that was first listened to for two tracks. Then the AMR was put on and it comprehensively beat the CAL CL-15, at that time I thought the Cary will have it's work cut out if it were to stay with this, then it was put on and we were stunned that it was better than the AMR.

Cheers George
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Old 11th February 2013, 02:54 AM   #202
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Yikes, George, I think you should have been a bit more ... diplomatic.

You better get your flame suit on!

Regardless of your preferences, the size of the trouncing seems odd?
Can you say more about the session: source, data (rate, 16/24bit), setting of the Lightspeed ...

Cheers,
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Old 11th February 2013, 03:17 AM   #203
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Quote:
Originally Posted by AudioLapDance View Post
Yikes, George, I think you should have been a bit more ... diplomatic. Why? I don't like glossing over the facts, I never said the AMR sounded bad, in fact after the CL-15 I thought nothing could be better it, till the Cary went on.

You better get your flame suit on! Doesn't worry me, I have a thick skin

Regardless of your preferences, the size of the trouncing seems odd?
Can you say more about the session: source, data (rate, 16/24bit), setting of the Lightspeed ...All were RedBook 44.1 one or two were HDCD encoded RedBook which sounded even better again. The Lightspeed was the owner of the system and it was around 1/3 up from zero give or take for all 3 cdp played. Cheers george

Cheers,
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Last edited by georgehifi; 11th February 2013 at 03:21 AM.
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Old 11th February 2013, 03:52 AM   #204
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Originally Posted by georgehifi View Post
The Lightspeed was the owner of the system and it was around 1/3 up from zero give or take for all 3 cdp played. Cheers george
Can you do the math on: that vol setting, into those amps ... what impedance would the CDplayer see? 10k, 50k, 100k?
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Old 11th February 2013, 05:49 AM   #205
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They (all the cdp's) would see around 7kohm load with the 100kohm of the Halcro DM-78's added to the Lightspeed
The 100ohms output impedance of the AMR would have no trouble with this, as would the 68ohm of the CAL-CL15 as would the 100ohms of the Cary. All had around the same gain as the Lightspeed indicated for the cdp's with the same volume settings at around 10 o'clock knob position.

Cheers George
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Old 12th February 2013, 12:05 AM   #206
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Originally Posted by abraxalito View Post
I have an idea that perhaps its incompatibility between the Halcros and the AMR. Halcro from what I know of it is an ultra-low distortion, ultra high-feedback design. The AMR being normal NOS puts out lots of out-of-band images between 22 - 44kHz. Perhaps this ultrasonic output upsets the Halcro and saps the dynamics.
Hi Abraxalito, Hi George,

John from ECdesign said something like that too. The NOS design and the DEM do not match with high switching amp or SMPS in poweramp.

Interesting proof of concept. George maybe anaother listening session with the same speakers and wires but with a Conrad Johnson 350 for curiosity... and the "poor" AMR77 owner?

BTW, i have a old Chord SMPS 1200 B (smps power supply style & 100k inputs) maybe I have to try the ad844 i/v with an I2s out from my Squeezebox... but haves some difficulties to check a good shematic around the tda1541 (DEM, I2S<), john 's thread is hard to follow... i'm just a hobbyst.

cheers

Last edited by Eldam; 12th February 2013 at 12:16 AM.
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Old 12th February 2013, 12:47 AM   #207
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Hang on you guys are reading too much into the AMR being beaten, as I said it sounded great, it also comprehesivly beat out the CAL CL-15 which is no slouch being PMD100, PCM1702 massive power suplies and a discrete direct coupled I/V and buffer. Look at the review and more so the measurments California Audio Labs CL-15 CD player | Stereophile.com
As for the Cary 303/200 AD844 (also direct coupled all the way) combo beating it, yes did, but I would own the AMR in a flash if priced much lower if I didn't have the Cary now. I point my finger at tubes and the associated coupling caps causing it, to be out done by the Cary.

Cheers George
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Old 12th February 2013, 01:44 AM   #208
Eldam is offline Eldam  France
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I just say that the listing session was interesting and if you have the possibility to double it with an SS amp of a good quality too but no SMPS in it for checking the importance of NOS design // to the amp. BTW, it's not the subject of your thread but maybe interesting to understand the limit/no limit of the ad844 I/V design.

I have to test by myself cause your shematic seems simple to realise with veroboard and thanks for that...
Can I test it with a TDA 1541 with the sames values ?

cheers
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Old 12th February 2013, 02:12 AM   #209
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TDA1541 resources from the thread:
(I'll be lookin' into this soon ...)

ad844_c-b_i-v_sch.gif

Pedja 1541 NOS AD844IV wBUFFER.png

I'm not sure what to set the current source at for the 1st hookup? 1/2 way?

Circuit to try after the AD844:
http://www.google.com/url?sa=t&rct=j...57700187,d.aGc

PS Hey Dirkwright, can you post that ad844 tina file? Thanks!

Last edited by AudioLapDance; 12th February 2013 at 02:24 AM.
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Old 12th February 2013, 02:50 AM   #210
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Ok, found a AD844 model and converted to TINA

ad844.zip

But ... how do you model the output of a TDA1541 or PCM1704 in TINA?!?
Doh!
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