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LP70s bias question
Hi Guys,
First a big hello, and to say what a pleasure it is to have found so many CJ fans here at AA. And secondly a question, would be very grateful for any suggestions. I recently shipped my LP70s back from asia to London and thought it would be a good opportunity to replace the tubes. I took the plunge and ordered a quad of Tungsol KT120s. Problem is with the tubes in place I cannot get the bias right, doesn't matter how much I play with the setting the LED never lights. The sound is clearly wrong, compressed and scratchy. Do I need to do anything else to get these tubes working in the amp? Or more worrying could I have broken anything else inside? Cheers, Nick Last edited by chapitalist; 07-27-2012 at 02:27 PM. |
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chapitalist... Welcome To AA!!!
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Quote:
__________________
Myles Astor, Senior Editor., Positive-Feedback.com, Goldmund Telos 300 amplifier, Goldmund Mimesis 37S Nextgen preamplifier, Doshi EVO phono and tape stages; Zellaton Plural EVO speakers; VPI Vanquish Turntable, VPI 12-inch Fat Boy gimbal arm and SAT LM-12 arm; Lyra Atlas SL Lambda, Fuuga mk.2, vdh Colibri Master Signature cartridges; Technics 1506/FM heads; Various cables including TA, MIT, Kubala-Sosna, Skogrand, Viero L3 Equilibrio speaker cables, Audience, SRA Craz 3 rack, Isobase and OHIO Class XL+2.1 platforms. |
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There is clearly a problem with the amp. As Myles said check the tube protection fuse first, you have an LED next to the fuse that will light up if the fuse popped. If this is not the case there are more fuses inside the unit but it should be serviced by someone who knows what he is doing.
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Quote:
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Thread revival. FYI- I had this same issue, led never came on and it was the tube. New tube and bias no problem.
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Yep.......... always look at what you did last (change tubes) and work back from there. Good luck. Miss my CJ gear. Great stuph.
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Glenn... Canton Reference 9 Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 & MR88 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B, ST-J75 & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag |
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