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Audio and Video Talk
Valves / Vacuum Tubes
Pioneer valve amp rebuild
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<blockquote data-quote="Ampdog" data-source="post: 227502" data-attributes="member: 144"><p>From me, not quite ......</p><p></p><p>The 'middle valve' gives about 2x the gain lost in the tone controls, so your sensitivity <em>will</em> be down.</p><p></p><p>If you can tolerate that, Iwould still keep that valve and use it as a cathode follower (in that case rather go to an ECC81/12AT7 - ECC83 not optimal for that). You will compromise slightly by feeding the main amplifier directly from the rather high 1M volume control slider (unless you also dispense with C25 and R33 and feed the volume control directly into the V42 grid (pin 1).</p><p></p><p>Why do you want the tone controls out? [...although they could be made a little more linear in this case; C15, C17, R70(?) not optimal.]</p></blockquote><p></p>
[QUOTE="Ampdog, post: 227502, member: 144"] From me, not quite ...... The 'middle valve' gives about 2x the gain lost in the tone controls, so your sensitivity [I]will[/I] be down. If you can tolerate that, Iwould still keep that valve and use it as a cathode follower (in that case rather go to an ECC81/12AT7 - ECC83 not optimal for that). You will compromise slightly by feeding the main amplifier directly from the rather high 1M volume control slider (unless you also dispense with C25 and R33 and feed the volume control directly into the V42 grid (pin 1). Why do you want the tone controls out? [...although they could be made a little more linear in this case; C15, C17, R70(?) not optimal.] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Pioneer valve amp rebuild
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