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Old 27th March 2008, 07:25 PM   #1
john65b is offline john65b  United States
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Default Anyone familiar with Bel Canto Pre1?

Hey all,

I have recently acquired a Bel Canto Pre1 (total impulse buy, but came with a new S300 Amp and a Audio Refinement CD Complete unit - both of which are for sale on DIYAudio)

I opened her up to see her "guts" and was surprised to see an OPA2134 opamp. I thought the pre was based around a Tube...

Anyway, I haven't done any real evaluation of it yet (sleeping kids, angry wife, etc), but from what I have heard at low volume, I am optimistic. Sounded very nice as a matter of fact on my Magnepan MGIIIa/Krell KSA-50 Clone.

Anyone have any info (schematic) or mods to suggest? My first thought is get rid of the OPA2134 and put in a pair of OPA627, or a another better opamp...

Anyone??

Maybe this time I leave it alone...nah.
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Old 28th March 2008, 02:03 AM   #2
jaycee is offline jaycee  United Kingdom
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The OPA2134 is an excellent opamp, I see no reason to replace it to be honest!
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Old 28th March 2008, 02:44 AM   #3
john65b is offline john65b  United States
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Hmmm, actually I have at least three of these OPA2134 Opamps laying around.

Forgive me for asking such an asinine question, but would "stacking" Opamps have any benefit here?

I know "stacking" TDA1543 DAC chips it makes quite a difference over just one...

I have a 4x TDA1543 DAC (Kusinoki style) and it really sounds much better over a single TDA1543 - I really like it...
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Old 28th March 2008, 12:10 PM   #4
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John, let's drop me a mail!
andylfrancis@gmail.com
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Old 29th March 2008, 02:29 PM   #5
john65b is offline john65b  United States
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OK, forget my previous mention of "stacking" the opamps...

BTW - I tried it on a DAC (2x OPA2134) without manipulating any voltages or components, but didn't really have time to do any critical review...it did work tho...got a little worried and dismantled it.

I am ordering a pair of OPA627AP to drop in...any opinions on this mod?
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Old 30th March 2008, 12:29 AM   #6
john65b is offline john65b  United States
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I replaced the OPA2134 with a socket and have tried a OPA2227 and a LM6172. The LM6172 is staying for now. SOunds nice so far.

Haven't done any critical listening yet....after the kids go to bed...so far so good.

I also have a LM1364, LM4562, another OPA2134 in my possession and ordered a pair of OPA627AP opamps with a dual adapter that should arrive in a few days/weeks.

Can't wait...
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