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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: EL519 working condition as pentode posted by wlee on August 27, 2005 at 13:23:10:
Hi William,I have graphed the EL519 as a conventional triode (Siemens tube) right out through 900v to anode and bias at -280v. No sparks or screen runaway etc - just brow-sweat doing it....
It is a lazy-triode - just like the PL504: With 450v to anode, a bias figure of - 130v results in an anode-current of 75ma. These figures are just under the 35 watt anode-dissipation figure. Sorry, cannot locate the other figures re mu etc. The curves are linear and quite impressive - despite the drive requirements.....
(The 6L6 family - eg 6146 - are similarly "very lazy triodes". The 6V6 is far better as a triode, as is the EL84 (and EL86). The EL81 is yet better again - triode-wise. Yet better again at a similar plate-dissipation figure (triode-connected is the 6360 paralleled) To step-up, the QQv06-40 as a paralleled-triode would seem to match/better 300B tubes.............NO I have not built/listened to the latter, and YES, accuse me of listening to valve-curves...
I have driven both both EL34s and genuine KT88s hard as triodes - both families succombe to runaway - and not so far above where typical circuitry runs them.....)
Perhaps I should include that I run copies of the ARC SP10 pre-amp and D76 circuitry - ie pentodes with regulated(tube) to the screen...It has sufficed for me for nearly 15 years...Been wanting to respond to "Bambi's" comments re SP10....my clone is just that, though I included a mains filter...............he says it is hard on tubes...I say my tubes have lasted for years. The anode voltage/current figures are on spec....Telefunkens proved "steely". Siemens seemed "weightless". I settled for tubes branded as "Amperex" These are different for the anode-structure is open "at the side", giving clear-view of the cathode. So, they may be "East-european" - so what.........
Graeme
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Follow Ups
- Re: EL519 working condition as pentode - fourhooker 22:03:46 08/27/05 (1)
- Re: EL519 working condition as pentode - wlee 23:30:42 08/27/05 (0)
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