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Audio and Video Talk
Valves / Vacuum Tubes
LUXMAN MQ70 tube amplifier (new issue)
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<blockquote data-quote="Ampdog" data-source="post: 971068" data-attributes="member: 144"><p>Time to conclude my contribution here:</p><p></p><p>I had little to no informative reaction to queries PM'd to other notable members of earlier contributions. Nobody offers any particular clarity regarding the 'mystery' diodes; in fact, surprise was expressed re further interest. I could also not retrace the previous thread (some 5-6 years ago).</p><p></p><p>Thus I must suffice with own experience and memory. As said, all hail to whoever is happy with their MQ70s at present. The amplifier iron at least is/was very good.</p><p></p><p>[Footnote: Regarding the driver valves, because of the design of the stage a number of medium-? triodes will actually serve. Main requirement is a low Va(sat) value because of the extra signal amplitude required by the EL34 cathode feedback feature. In this respect the 6SG7 (equivalent of the old workhorse 6SN7) is slightly better suited than the ECC85; the 12BH7 would be better still. (Again the choice of a 'long' tail in the form of a cathode resistor of all of 10K in this stage , 'robbing' it of some sorely needed h.t., mystifies . . . but enough.)]</p></blockquote><p></p>
[QUOTE="Ampdog, post: 971068, member: 144"] Time to conclude my contribution here: I had little to no informative reaction to queries PM'd to other notable members of earlier contributions. Nobody offers any particular clarity regarding the 'mystery' diodes; in fact, surprise was expressed re further interest. I could also not retrace the previous thread (some 5-6 years ago). Thus I must suffice with own experience and memory. As said, all hail to whoever is happy with their MQ70s at present. The amplifier iron at least is/was very good. [Footnote: Regarding the driver valves, because of the design of the stage a number of medium-? triodes will actually serve. Main requirement is a low Va(sat) value because of the extra signal amplitude required by the EL34 cathode feedback feature. In this respect the 6SG7 (equivalent of the old workhorse 6SN7) is slightly better suited than the ECC85; the 12BH7 would be better still. (Again the choice of a 'long' tail in the form of a cathode resistor of all of 10K in this stage , 'robbing' it of some sorely needed h.t., mystifies . . . but enough.)] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
LUXMAN MQ70 tube amplifier (new issue)
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