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EL84 higher voltage operation
EL84 higher voltage operation
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Old 12th June 2018, 07:42 PM   #11
davorin is offline davorin  Croatia
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In this guitar amp.("Seymour Duncan" model 84-40) with 4xEL84 is Ua=550V and Ug2=275V!
At last service I build in 4xEL84 "JJ"-brand, and work good last ~2 year!
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Old 13th June 2018, 07:12 PM   #12
Skorpio is offline Skorpio  Denmark
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Thank you all for very nice answers :-)

I guess somewhat adjustable Vg2 would be a good option....
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Old 13th June 2018, 08:53 PM   #13
Lingwendil is offline Lingwendil  United States
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EL84 higher voltage operation
Having adjustment for G2 per output pair is usually good enough, if going for individual G1 adjustment or balance to fine tune things. On most applications G2 current will not be all that high, so the expense of setting up and heatsinking an additional regulator isn't all that much fuss. How gilded do you like your lilies?
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Old 13th June 2018, 09:31 PM   #14
wrenchone is offline wrenchone  United States
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Thanks for this thread, as it's germane to the EL84 amp I've yet to finish. Its power transformer came from a Fisher console, and the B+ is a bit frisky, and may remain so under load with having to supply just four EL84s (the fnont end is sand-state and runs off a separate supply XFMR). I'll probably try using a zener-regulated screen supply for each channel, or possibly a simple fet-based linear pass solution. I'm using JJ EL84s.
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Old 13th June 2018, 09:47 PM   #15
Lingwendil is offline Lingwendil  United States
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EL84 higher voltage operation
I've got a set of boards hopefully coming in the mail today just for such applications, I'll post up a thread soon, classic but useful
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Old 13th June 2018, 10:38 PM   #16
Wavebourn is offline Wavebourn  United States
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EL84 higher voltage operation
It is not about EL84 only. It works with any pentodes and beam tetrodes. For example, I have a PP amp with paralleled 6P3S tubes. 40W only from 4 tubes, but it was the only way to get high-end sound from such tubes. When G2 voltage is as high as anode voltage, for such linearity they would dissipate enough power to melt down the glass.
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