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Audio and Video Talk
The Vintage Audio Section
Conrad-Johnson Premier Three pre-amp
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<blockquote data-quote="MusicMan_ZA" data-source="post: 1049469" data-attributes="member: 14924"><p>Quick update: I hope I am not jumping the gun, but I think all my issues have been sorted out!</p><p></p><p>1. I have tested the MODE switch with a youtube stereo speaker test video, and everything works as it should. :thumbs:</p><p></p><p>2. Answered by A.S. and yes, RTFM! :thumbs:</p><p></p><p>3. I lifted the lid, stared at the components, and scratched around in my valve box.</p><p>As I have tested with CD/DAC input earlier today, I knew the problem was not specific to</p><p>the Phono input stage, so I suspected a valve in the pre-amp section.</p><p></p><p>Of course, I had no 5751 valves in my box.</p><p>However, I found a lovely NOS Mullard ECC81 (yellow writing, old badge, from the 60's).</p><p>As the manual states that the single 5965 valve may be replaced with an ECC81 with only "subtle degradation" of sound, </p><p>I did just that, and fired up the system.</p><p></p><p>Now, 4 hours later, it is still playing perfectly, and the sound (on both channels) is much better than before!</p><p>Probably because the "new" ECC81 has a bit more gain, but most probably because the (almost 40-year) old</p><p>5965 was shot!?</p><p></p><p>I will play, monitor and report back.</p><p>And start looking for a few 5751 valves... :groovy:</p><p></p><p></p><p> </p><p></p><p> </p></blockquote><p></p>
[QUOTE="MusicMan_ZA, post: 1049469, member: 14924"] Quick update: I hope I am not jumping the gun, but I think all my issues have been sorted out! 1. I have tested the MODE switch with a youtube stereo speaker test video, and everything works as it should. :thumbs: 2. Answered by A.S. and yes, RTFM! :thumbs: 3. I lifted the lid, stared at the components, and scratched around in my valve box. As I have tested with CD/DAC input earlier today, I knew the problem was not specific to the Phono input stage, so I suspected a valve in the pre-amp section. Of course, I had no 5751 valves in my box. However, I found a lovely NOS Mullard ECC81 (yellow writing, old badge, from the 60's). As the manual states that the single 5965 valve may be replaced with an ECC81 with only "subtle degradation" of sound, I did just that, and fired up the system. Now, 4 hours later, it is still playing perfectly, and the sound (on both channels) is much better than before! Probably because the "new" ECC81 has a bit more gain, but most probably because the (almost 40-year) old 5965 was shot!? I will play, monitor and report back. And start looking for a few 5751 valves... :groovy: [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Conrad-Johnson Premier Three pre-amp
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