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Old 2nd April 2009, 04:13 PM   #1561
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Default Never ending rewardding process

New modification... this time I am in awe

I was loading the benz ACE (M) with a 2K21 RC55Y Welwin 0,1% metal film. sound was very good but I missed that final high freq attack and presence.

Based on previous experiments and using the feedback of the forum menbers I decided to use a 2K4 Shinkoh.

Now I am hearing Zappa´s Zoot Allures as never before..... the bass is very heavy but detailed, the highs are powerfull, detailed, with outstanding attack but never strident.

The best part is I can hear small info that was masket before, enhancing imagery, focus and stage size.

There is a sence of independency between the instruments I was not aware of before.

how can I explain these differences ? are shinkoh lower noise then metal film ?

Ricardo

PS:
This makes me remenber my B&O tangencial tonearm while using the saphire cantilevered MCC in my old defunct system. 20years ago
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Old 2nd April 2009, 04:17 PM   #1562
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there is some LSD on shinkoh

well done!
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Old 2nd April 2009, 04:32 PM   #1563
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Quote:
Originally posted by nicoch46
there is some LSD on shinkoh

well done!
Incredibly I had just the same thought

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Old 2nd April 2009, 04:43 PM   #1564
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He, he, tripping performance! Nicoch and I we were urging you for long...
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Old 2nd April 2009, 11:21 PM   #1565
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Dr. Hoffman would be proud if he knew the impact of his discovery
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Old 2nd April 2009, 11:29 PM   #1566
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The Bicycle Ride

He knew, he died just yesteryear at the age of 102!
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Old 3rd April 2009, 12:42 PM   #1567
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Power amplifiers 100 to 400 plus watts are used to drive the tiny coils (one for each channel) in the cutting head. They’re like miniature speakers which instead of just moving air, push the stylus that etches the groove in your record. With 20 dB of treble boost, you can only imagine the beating that the cutting head takes from cymbal crashes and the like. The coils are helium cooled but still can reach 200 degrees Centigrade. A circuit breaker is used to prevent catastrophic destruction

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Old 3rd April 2009, 06:17 PM   #1568
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Hi nicoch46

Well, maybe what I read before was related with the power amps themselves (D Amps?).

I have another question regarding the 101b opamp, It is rigged as a inverted voltage gain (+IN to GND) and the feedback resistor R1 seems to be a 100k. The input resistor seems 6.9k so the gain must be R1/R2=14.5.

Now the strange part is that there is a small cap in parallel with R1.

What should be the purpose of bypassing the feedback resistor with a cap ?..... Should I remove it ?

Sorry for the offtopic but I really need some advise.

Ricardo
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Old 3rd April 2009, 06:21 PM   #1569
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Its 99% a feedback compensation capacitor. Its related to the original op amp. Fixing it for best performance or even for oscillation without it. This is original designer's territory, and has to do with certain layout and PSU.
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Old 3rd April 2009, 06:29 PM   #1570
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As I replaced the original NE5532 by a LME49720 (with uge gains in sonic quality), maybe I can remove them ?

Just looking at the circuit, it seems that at high freq the opamp would not have the same gain as in low freq...
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