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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="charles" data-source="post: 1052450" data-attributes="member: 2759"><p>A while back I restored a vintage CJ PV 2 pre-amplifier.</p><p></p><p>As I switched it on something happened more or less similar that happened to Agaton Sax's one.</p><p></p><p>It was coupled to a CJ power amplifier. A very loud and high pitched sound in the loudspeakers. Luckily I could immediate switch it off before it could probably damage the power amplifier.</p><p></p><p>Faults:</p><p></p><p>Had to open and repair a faulty balance faulty potentiometer. One must be careful when doing this.</p><p>Replace a intermittent on/off switch.</p><p>Test all the valves with an AVO valve tester. Most of it were replaced. </p><p>During this operation the set was also intermitted regarding its output.</p><p>Interesting, when testing the Insulation (heater/cathode) cold/hot of the valves, some </p><p>of the valves some had some "insulation" problems. </p><p></p><p>One must take care when switching on any vintage valve product.</p></blockquote><p></p>
[QUOTE="charles, post: 1052450, member: 2759"] A while back I restored a vintage CJ PV 2 pre-amplifier. As I switched it on something happened more or less similar that happened to Agaton Sax's one. It was coupled to a CJ power amplifier. A very loud and high pitched sound in the loudspeakers. Luckily I could immediate switch it off before it could probably damage the power amplifier. Faults: Had to open and repair a faulty balance faulty potentiometer. One must be careful when doing this. Replace a intermittent on/off switch. Test all the valves with an AVO valve tester. Most of it were replaced. During this operation the set was also intermitted regarding its output. Interesting, when testing the Insulation (heater/cathode) cold/hot of the valves, some of the valves some had some "insulation" problems. One must take care when switching on any vintage valve product. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Conrad-Johnson Premier Three pre-amp
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