I want to build a SE-Amp using the mighty EL 520V2 (http://www.emissionlabs.com/datasheets/EML520B-V2.htm).
Waht would be a good driver ? I was thinking of a MU-Driver like www.triodedick.com suggests, but I find as well DRD very attractive. I understand that I need 90-125V swing, the question is what a good driver tube / how much current should the driver tuber have ?
Waht would be a good driver ? I was thinking of a MU-Driver like www.triodedick.com suggests, but I find as well DRD very attractive. I understand that I need 90-125V swing, the question is what a good driver tube / how much current should the driver tuber have ?
The 520V2 looks expensive. This is the first I've heard of it.
What about a GM70 or triode-strapped 813? Their thoriated tungsten filaments will glow nicer, too 😎
In the first operating point data given for the 520V2 you will need 248Vp-p swing to realise full class A1 power. Not exactly an easy task to accomplish well...
What about a GM70 or triode-strapped 813? Their thoriated tungsten filaments will glow nicer, too 😎
In the first operating point data given for the 520V2 you will need 248Vp-p swing to realise full class A1 power. Not exactly an easy task to accomplish well...
I have a pair of these already here icl. the OPT. They are by far the most transparent, dynamic and natural souding tubes I tried. I believe the transparence come as well from the fact that the OPT needs to have only a bit more than 1K and therefore has a better response.
I used to run them in a Welborne Labs Apollo with a 6ea7 as a traditional 2-stage-driver. I have bought some new OPTs etc and want to sart a different approach now.
I used to run them in a Welborne Labs Apollo with a 6ea7 as a traditional 2-stage-driver. I have bought some new OPTs etc and want to sart a different approach now.
Going from 2Vrms to 88Vrms in a single stage is a big ask. No data is given on input capacitance, which is a shame.
Some valves may be able to do it, given the right circuit. You might be interested in Pete Millett's SE813 design with a single stage 12HG7 driver. Even so, the 813 will be considerably easier to drive than the 520V2.
Some valves may be able to do it, given the right circuit. You might be interested in Pete Millett's SE813 design with a single stage 12HG7 driver. Even so, the 813 will be considerably easier to drive than the 520V2.
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