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Audio and Video Talk
Valves / Vacuum Tubes
single-ended cathode follower output stage
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<blockquote data-quote="Mars" data-source="post: 573835" data-attributes="member: 817"><p>I assembled the circuit. Here's the first incarnation:</p><p><img src="https://lh5.googleusercontent.com/-7041BEeSD-Q/VXFdT-n3iyI/AAAAAAAAGqE/wJ21o3iPa04/w958-h719-no/IMG_7838.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://lh5.googleusercontent.com/-oC3KYNsAKRs/VXFdQjHHb-I/AAAAAAAAGp8/Wr_Ige4rH2M/w958-h719-no/IMG_7839.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Pre-amp 6AG5 wiring: I considered different anode/screen grid values, and settled on the the values for which I had resistors in the box :BWAHAHAH:</p><p>The resistance coupled chart in my RCA handbook suggests values and tabulates the gain for the combination. I first went for max gain, but that was a bit too much. The 220K/680K combination works well with my sound card and pre-amp. I might up the grid leak resistor for the EL84 to 1 Mega-ohm for slightly more gain.</p><p></p><p>I love the fact that there is no cathode resistor/bypass capacitor in this amplifier and that the power supply is quite simple.</p><p><img src="https://lh5.googleusercontent.com/-zq12IEbP9p4/VXFdHpAcDCI/AAAAAAAAGpk/XWyCGr6zBoE/w958-h719-no/IMG_7842.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Now a question. Is this a pentode or a triode output stage?</p></blockquote><p></p>
[QUOTE="Mars, post: 573835, member: 817"] I assembled the circuit. Here's the first incarnation: [IMG]https://lh5.googleusercontent.com/-7041BEeSD-Q/VXFdT-n3iyI/AAAAAAAAGqE/wJ21o3iPa04/w958-h719-no/IMG_7838.JPG[/IMG] [IMG]https://lh5.googleusercontent.com/-oC3KYNsAKRs/VXFdQjHHb-I/AAAAAAAAGp8/Wr_Ige4rH2M/w958-h719-no/IMG_7839.JPG[/IMG] Pre-amp 6AG5 wiring: I considered different anode/screen grid values, and settled on the the values for which I had resistors in the box :BWAHAHAH: The resistance coupled chart in my RCA handbook suggests values and tabulates the gain for the combination. I first went for max gain, but that was a bit too much. The 220K/680K combination works well with my sound card and pre-amp. I might up the grid leak resistor for the EL84 to 1 Mega-ohm for slightly more gain. I love the fact that there is no cathode resistor/bypass capacitor in this amplifier and that the power supply is quite simple. [IMG]https://lh5.googleusercontent.com/-zq12IEbP9p4/VXFdHpAcDCI/AAAAAAAAGpk/XWyCGr6zBoE/w958-h719-no/IMG_7842.JPG[/IMG] Now a question. Is this a pentode or a triode output stage? [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
single-ended cathode follower output stage
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