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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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<blockquote data-quote="charles" data-source="post: 573580" data-attributes="member: 2759"><p>From Ampdog;</p><p></p><p>"By the way, all models were fitted with the 8778 type output transformer. Stability criteria differ from earlier models with a 3921 OPT for which I have no data."</p><p></p><p>I have two ST20's: one is fitted with the 3921 OPT transformer and the other one with a 8778 OPT. One of these days I am going to do a comparison on them regarding total harmonic distortion and spectrum analysis to see how these two models differ from each other. Both are restored and I will use a set of NOS valves for the test. </p></blockquote><p></p>
[QUOTE="charles, post: 573580, member: 2759"] From Ampdog; "By the way, all models were fitted with the 8778 type output transformer. Stability criteria differ from earlier models with a 3921 OPT for which I have no data." I have two ST20's: one is fitted with the 3921 OPT transformer and the other one with a 8778 OPT. One of these days I am going to do a comparison on them regarding total harmonic distortion and spectrum analysis to see how these two models differ from each other. Both are restored and I will use a set of NOS valves for the test. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Leak Stereo 20 restoration/mods
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