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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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<blockquote data-quote="Ampdog" data-source="post: 576797" data-attributes="member: 144"><p>Skollie, </p><p></p><p>Regarding the green wire-wound resistor (R21). Replacing that once blown or de-soldered might be a problem. One does not know what solder was originally used or what the temperature characteristics of the resistor were. Modern multi-core solder (60% Sn, 40% Pb) melts at about 180?C. I read that the maximum temperature for ordinary w.w. resistors is 300? - 400?C. So fine there .... but how long will the leads take to reach say 200? at the solder point, what is their thickness and temp. conduct. factor? Again with respect to HJL, I would rather use a fuse - but then again one might have to look for a quite delayed fuse in order not to blow it too frequently. HJL might have had such a delay in mind, or just a rough "long-stop" measure. There is a main fuse.</p><p></p><p>Probably re-soldering with not too much solder and too long resistor leads one can approximate the intended condition. Is that likely to happen in repair shops? No - I doubt if anybody knows the purpose of those resistors these days. (One also gets these funny cement resistors these days. How will <em>they</em> behave?)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 576797, member: 144"] Skollie, Regarding the green wire-wound resistor (R21). Replacing that once blown or de-soldered might be a problem. One does not know what solder was originally used or what the temperature characteristics of the resistor were. Modern multi-core solder (60% Sn, 40% Pb) melts at about 180?C. I read that the maximum temperature for ordinary w.w. resistors is 300? - 400?C. So fine there .... but how long will the leads take to reach say 200? at the solder point, what is their thickness and temp. conduct. factor? Again with respect to HJL, I would rather use a fuse - but then again one might have to look for a quite delayed fuse in order not to blow it too frequently. HJL might have had such a delay in mind, or just a rough "long-stop" measure. There is a main fuse. Probably re-soldering with not too much solder and too long resistor leads one can approximate the intended condition. Is that likely to happen in repair shops? No - I doubt if anybody knows the purpose of those resistors these days. (One also gets these funny cement resistors these days. How will [i]they[/i] behave?) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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