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Audio and Video Talk
Valves / Vacuum Tubes
6L6 valves - some interesting test results
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<blockquote data-quote="Ampdog" data-source="post: 418555" data-attributes="member: 144"><p>Tangmonster,</p><p></p><p>To try ease your pain, I would say simply buy what is cheapest at any time! Again as comparison, I use 6L6GCs in my Hall? stereo amplifier .... at 550V anode voltage and 500V screen voltage! The anode dissipation is held to 26W. (Bias and screen voltages regulated.) Again, there is no noticable difference between modern 6L6GCs and 7027s - the latter rated at Va = 600V, Vg2 = 500V, Pa = 35W. One must just keep in mind that all these are at 25 deg. adequate ventilation! Also keep in mind that the rathr ancient 807 was rated at Va = 600V; some used it at Va = 800V.</p><p></p><p>I have mentioned somewhere that I have an erstwhile colleague who manufactured valves in the original Philips Eindhoven Factory; EL34s and such. I will try and get him out for coffee sometime. He once said that (within limits) electrode maximum voltages are quoted for certain applications and maximum voltages for normal operation. You will also notice that in certain tv applications even smaller valves like EL84 can work at 1000V for short durations. The voltage limitation with octal based tubes is at the botton inside the base, between connecting wires or pins with sharp inside edges, not inside the glass. Again: One must watch the total dissipation, as well as surrounding/ambient temperature!</p></blockquote><p></p>
[QUOTE="Ampdog, post: 418555, member: 144"] Tangmonster, To try ease your pain, I would say simply buy what is cheapest at any time! Again as comparison, I use 6L6GCs in my Hall? stereo amplifier .... at 550V anode voltage and 500V screen voltage! The anode dissipation is held to 26W. (Bias and screen voltages regulated.) Again, there is no noticable difference between modern 6L6GCs and 7027s - the latter rated at Va = 600V, Vg2 = 500V, Pa = 35W. One must just keep in mind that all these are at 25 deg. adequate ventilation! Also keep in mind that the rathr ancient 807 was rated at Va = 600V; some used it at Va = 800V. I have mentioned somewhere that I have an erstwhile colleague who manufactured valves in the original Philips Eindhoven Factory; EL34s and such. I will try and get him out for coffee sometime. He once said that (within limits) electrode maximum voltages are quoted for certain applications and maximum voltages for normal operation. You will also notice that in certain tv applications even smaller valves like EL84 can work at 1000V for short durations. The voltage limitation with octal based tubes is at the botton inside the base, between connecting wires or pins with sharp inside edges, not inside the glass. Again: One must watch the total dissipation, as well as surrounding/ambient temperature! [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
6L6 valves - some interesting test results
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