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#11
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A transformer is THE BEST step up device. Anything else adds distortion. |
#12
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With all due respect, a transformer is far from a perfect device and has its own set of compromises. You may prefer its lack of noise to some other active solutions but a transformer is not inherently better. As with most things in audio it often comes down to how well a specific approach is implemented, not the device itself being used.
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#13
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As Bill said the implementation is important but given quality designs our opinion is that properly implemented MC transformers are the best approach. Our MC transformers are custom made for us to exacting standards. The advantage a transformer has is because a Moving Coil cartridge has very high 'current' output but very low 'voltage' output. So a transformer simply uses that high current output and 'transforms' it to the voltage which the phono stage requires for amplification purposes. The advantage of this approach is that the 'noise floor' of the cartridge becomes the limiting factor rather than the noise floor of an active MC transistor based step-up style MC stage. Active transistor based step-ups have to take the very little voltage available from the MC cartridge and amplify it many, many times which increases the noise. So in our opinion a low noise floor is critical in quality phono reproduction. Others may disagree but look at the quality cartridge manufactures that also build step-up devices for their cartridges and I think you will find most of them recommend transformers. james Last edited by James Tanner - Bryston; 04-05-2017 at 07:13 AM. |
#14
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James, you confirmed that BP2 and BP17p are "equivalent" phono stages but when I look at the pictures the BP2 has a more modern design with surface mount parts and other stuff compared to the Internal Phono board, so how different do they actually sound? I am just talking straight MM configuration for now.
Also what is the impedance load of both stages and which one is more configurable? I see there are jumpers for Capacitive load settings on the BP2 but what about the Internal Phono? What is the resistive load? Last edited by Stefan_DR3; 04-19-2017 at 01:14 PM. |
#15
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Regarding the MC options, what are the turns ratios or resistive loads of the MC-20 and MC-30?
Also in the user manual on p4 there is a typo where it says MC-20/30 "optimum x ohms with <>3mV output" I think it should be 0.3mV. Last edited by Stefan_DR3; 04-19-2017 at 01:12 PM. |
#16
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Getting close to making a purchase decision and need the specs. I have checked user manuals and brochures on Bryston.com
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#17
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Please email Stuart Taylor the designer on this please. staylor@bryston.com james |
#18
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1) The BP17 and BP26 use the same circuit but the components differ between through hole parts (BP26) and Surface mount parts (BP17). 2) The MM input impedance is 47k ohms. 3) The BP26 MC input impedance is 180 ohms - we can provide 25 ohms and 5 ohms as well. 4) The BP17 is currently MM only. Hope this helps Stuart Taylor |
#19
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If I put a TF-20 on it, standard turns ratio would be 10:1, so input impedance becomes 47k/100 = 470 ohms... ...which is a bit higher than the BP26MC at 180 ohms. |
#20
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Gents,
I inserted the TF-2 into my system last night. So the Ortofon Quintet Black feeds the TF-2 into the phono stage of the CJ preamp. I sure have plenty of gain now! My system is very different than it was in CT, but I can’t tell yet which characteristics to attribute to room acoustics and which to the new cartridge. But I had imaging this evening way outside the speakers and good depth too. Dynamics of the Quintet Black are good and my system is resolving that well. I played Surfer Girl and In My Room from a MoFi pressing of Surfer Girl and the staging was awesome, vocal presentation dead center. Mike |
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