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Conrad-Johnson Premier 350 discussion
This thread is for discussion of the famous Conrad-Johnson Premier 350 amplifier:
From the C-J website: Hybrid Solid-State Circuit. The Premier 350 benefits from an interesting hybrid of solid-state technologies. The distortion characteristics of an amplifier are dominated by it's voltage gain stage. We have selected FETs for this application, because, like tubes, and unlike bi-polar transistors, they produce almost no strident odd-order harmonic distortion. The output stage of an amplifier must efficiently couple the high amplitude signal produced by the voltage gain stage to the loudspeaker system to assure the power and control needed to produce a musically accurate response. Bi-polar devices have been specified for the output stages of these amplifiers because they offer about 1/4th the output impedance of a MOSFET, resulting in much better control of the loudspeaker. This is most noticeable in faster, more solid bass response. Zero Feedback. Negative feedback is an engineering technique used to reduce measured distortion. While feedback does achieve this goal, it also introduces aberrations in the tran-sient response characteristics of the circuit. The Premier 350 uses conrad-johnson's unique auto-linear gain block for the voltage gain stage, which achieves low distortion with zero loop feedback by exploiting the symmetrical distortion properties of n and p channel fets. Solid Power Supplies. Power supply circuits present a parallel signal path to the audio circuits. Ideally this signal path provides ac signals with a zero impedance path to ground. Any deviation from this ideal is reflected in the reproduced audio signal. Thus the power supplies are as important to audio performance as the audio circuits and must be accorded equal attention in design. The Premier 350 features a discrete dc regulators to power the critical voltage gain stage. Quality Parts. As with all Premier components, the Premier 350 is constructed from the highest quality, carefully selected parts for unrivaled sonic performance and reliability. The circuits employ polypropylene and polystyrene capacitors extensively, except in the main power supply storage, where special high-speed electrolytics are used because of the extremely high capacitance required. The audio circuit and related power supplies utilize precision low inductance laser-trimmed metal foil resistors. The obsession for parts quality extends to the high quality, gold plated input jacks and output connectors - even the internal wiring is chosen on the basis of its sound quality in its specific application. Thoughtful engineering, specification of the finest available component parts, and painstaking care taken in production make this an audio amplifier without peer in music reproduction. We invite you to arrange an audition with your conrad-johnson dealer to confirm for yourself the extraordinary musical performance of the Premier 350.
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components. |
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Gentlemen, start your engines...
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dpod my friend... I should add two more suggestions:
First... as you doubt already know, that thing is a heavy 85 lb. and is not a well balanced lift. The left side is so much heavier than the right. It's a hoss to move around... and please be careful. The cooling fins on the left side all have sharp edges and will show no mercy to your forearms. Secondly... although this may be a good thing as you already like the sound...this was one of the first units in which C-J used proprietary teflon caps. I don't remember a break-in issue but the sound should only get better for you with time. I've never found the sound at all fatiguing and none of the reviewers that I've read did either. Is it as holographic as my LP140 tubes, probably not but it sure is faster with tighter lows. Back to the Ravens. Enjoy the champaign beast! Bob Last edited by Coppy; 11-24-2011 at 09:44 PM. |
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Where does it say it has teflon caps? certainly not in the spec's Quote:
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I can remember discussing the caps with Tor Sivertsen (then sales manager for C-J) when I bought the 350 some years ago. Bob Last edited by Coppy; 11-25-2011 at 12:12 AM. |
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Quote:
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components. |
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We need Coppy to chime in...he's got a Pr350 IIRC....
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components. |
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I'm here... just tuned in to this thread. You folks know how I feel about this AMP, it's an incredible bargain for this level of performance... can't let it go. Some say it's a bit delicate but I've not had any issues although I'm careful not to connect/disconnect anything while it's on or has been on. Those big caps inside retain a good deal of their power long after it's shut down. As has been said, be careful not to short the outputs... ever. I think some folks at dealers who are constantly pulling equipment in and out for demo have had difficulty when they were too casual about connections.
Now that's said, enjoy the dynamics... the P350 will drive just about anything. And it's response is dead flat. It's still a reference amp for reviewers overseas. It's difficult for them to use our beloved tube amps as the don't always match speakers. Here's a ToneAudio review if it comes through on this post... /Users/rbc7/Downloads/review_premier350_j_dorgay_ta.pdf Hmm... maybe not. Got to figure out how to add this PDF file. In the meantime, enjoy the music. Stephen... how are the KT120s doing? Last edited by Coppy; 11-23-2011 at 05:34 PM. |
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Nov 2011. Unpacked brand new PR 350. I am living in a special time space continuum.
image-623600501.jpg image-3603180099.jpg image-157297460.jpg image-1744623333.jpg image-4128853499.jpg Last edited by dpod4; 11-23-2011 at 01:27 AM. |
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