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Audio and Video Talk
Valves / Vacuum Tubes
Mars 5-10 stereo - update
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<blockquote data-quote="Ampdog" data-source="post: 918411" data-attributes="member: 144"><p>Karel,</p><p></p><p>Ah! Well done! </p><p></p><p>In the past I noticed that the 5-10 tone controls are somewhat compromised; not a true log-configuration, as is evident from your analyses. Since the input these days is likely to be from low output impedance devices (not a crystal pick-up as was then), one could decrease the tone stack values say some four-fold to make matters more practical. That would take one to 500K potentiometers plus associated components.</p><p></p><p>You are one ahead of me right now in that my flippen Spice program will not work. Thus I cannot model for different values, but will calculate with pocket calculator to find new values and contact you later, perhaps by PM so that you can put these through your simulation program first. [E.g. the response with controls set at mid-position should be a straight horizontal line, without the 6 dB deviation found by you. (though it seldom is because of making pots true logarithmic in pactice, plus the even greater difficulty of making ganged log pots to track. Ah well ....)] </p></blockquote><p></p>
[QUOTE="Ampdog, post: 918411, member: 144"] Karel, Ah! Well done! In the past I noticed that the 5-10 tone controls are somewhat compromised; not a true log-configuration, as is evident from your analyses. Since the input these days is likely to be from low output impedance devices (not a crystal pick-up as was then), one could decrease the tone stack values say some four-fold to make matters more practical. That would take one to 500K potentiometers plus associated components. You are one ahead of me right now in that my flippen Spice program will not work. Thus I cannot model for different values, but will calculate with pocket calculator to find new values and contact you later, perhaps by PM so that you can put these through your simulation program first. [E.g. the response with controls set at mid-position should be a straight horizontal line, without the 6 dB deviation found by you. (though it seldom is because of making pots true logarithmic in pactice, plus the even greater difficulty of making ganged log pots to track. Ah well ....)] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Mars 5-10 stereo - update
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