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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: 576789" data-attributes="member: 144"><p>Thanks Afroaudio,</p><p></p><p>That is the schematic in my possession, though not indicating for which OPT. Anyway, I would doubt that there would have been much difference in characteristics of the OPTs.</p><p></p><p>I can only repeat that there were signs of latent l.f. instability after e.g. a momentary short overload. The amp took some two cycles to stabilise. By eliminating C5 from the 'stability algorithm' by making it large, return to stability following an overload pulse was immediate. [I have only recently received my PC with my Spice software back after service (I use a separate one disconnected from any internet access), and will do a l.f. simulation there when next I have time.]</p><p></p><p>It would then appear that C5 was 100nF in later models, but again I have no data as to with which OPT. </p><p></p><p>Charles? </p></blockquote><p></p>
[QUOTE="Ampdog, post: 576789, member: 144"] Thanks Afroaudio, That is the schematic in my possession, though not indicating for which OPT. Anyway, I would doubt that there would have been much difference in characteristics of the OPTs. I can only repeat that there were signs of latent l.f. instability after e.g. a momentary short overload. The amp took some two cycles to stabilise. By eliminating C5 from the 'stability algorithm' by making it large, return to stability following an overload pulse was immediate. [I have only recently received my PC with my Spice software back after service (I use a separate one disconnected from any internet access), and will do a l.f. simulation there when next I have time.] It would then appear that C5 was 100nF in later models, but again I have no data as to with which OPT. Charles? [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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