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Valves / Vacuum Tubes
Small vacuum tube integrated for desktop use
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<blockquote data-quote="Mars" data-source="post: 1120585" data-attributes="member: 817"><p>Hi All, an update on the project:</p><p></p><p>[ATTACH=full]17001[/ATTACH]</p><p></p><p>I completed the prototype to confirm voltages and layout before I construct the final version in the new enclosure.</p><p></p><p>The DCV on the first filter capacitor (330uF 450V) is 430V which is a safe voltage for the 450V rating. </p><p></p><p>I measure 17V across the 330 ohm cathode resistor of the 807, which means the tube is running at just over 20 watts dissipation (25 watts is the absolute max). The ECC88 has 140V across each triode which is within the limits for safe use and good tube life.</p><p></p><p>I am running it currently from my PC sound card with great results. I'll connect the DAC tonight to evaluate bass balance in the over all sound.</p><p></p><p>The engineers have given us a favourable quote on the enclosure and production is in process. We hope the get the enclosure in hand early next week so construction can be completed by month end.</p><p></p><p>Some more photos:</p><p></p><p>[ATTACH=full]17002[/ATTACH][ATTACH=full]17003[/ATTACH][ATTACH=full]17004[/ATTACH][ATTACH=full]17005[/ATTACH]</p></blockquote><p></p>
[QUOTE="Mars, post: 1120585, member: 817"] Hi All, an update on the project: [ATTACH type="full"]17001[/ATTACH] I completed the prototype to confirm voltages and layout before I construct the final version in the new enclosure. The DCV on the first filter capacitor (330uF 450V) is 430V which is a safe voltage for the 450V rating. I measure 17V across the 330 ohm cathode resistor of the 807, which means the tube is running at just over 20 watts dissipation (25 watts is the absolute max). The ECC88 has 140V across each triode which is within the limits for safe use and good tube life. I am running it currently from my PC sound card with great results. I'll connect the DAC tonight to evaluate bass balance in the over all sound. The engineers have given us a favourable quote on the enclosure and production is in process. We hope the get the enclosure in hand early next week so construction can be completed by month end. Some more photos: [ATTACH type="full"]17002[/ATTACH][ATTACH type="full"]17003[/ATTACH][ATTACH type="full"]17004[/ATTACH][ATTACH type="full"]17005[/ATTACH] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Small vacuum tube integrated for desktop use
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