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Old 9th May 2009, 04:59 PM   #1
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Question Ecl82

Hello, what do you think about this scheme?

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Old 9th May 2009, 05:15 PM   #2
bigwill is offline bigwill  United Kingdom
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Looks ok, although the anode resistor on the input triode looks a little low. It may need some negative feedback too, seeing as the output valve is being run as a pure pentode
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Old 9th May 2009, 05:20 PM   #3
bigwill is offline bigwill  United Kingdom
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Another suggestion, the ECL82 may make a great valve to make an RH84 inspired amplifier with. Someone else may have to back me up on that though. It will probably sound better than the circuit you have posted, and be very easy to build (basically one extra resistor than the schematic you have)

Edit: The ECL82 seems to contain half of an ECC81 and a de-rated EL84, so it could be perfect. You could pretty much build the RH84 amplifier exactly, but with a bigger cathode resistor on the pentode section to back off the bias and thus plate dissipation (not as high as a "full" EL84)
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Old 9th May 2009, 05:28 PM   #4
aurche is offline aurche  Bulgaria
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Aleks doesn't like the EL84. I don't neither.
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Old 9th May 2009, 05:30 PM   #5
bigwill is offline bigwill  United Kingdom
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Quote:
Originally posted by aurche
Aleks doesn't like the EL84. I don't neither.

I didn't say use an EL84

I said the pentode section of an ECL82 is SIMILAR to an EL84. If you don't like the EL84 then by rights you shouldn't like the ECL82 either.

Let Alex speak for himself about his taste in valves
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Old 9th May 2009, 05:34 PM   #6
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Alexandar,

FWIW, I've been involved in a SE 6BM8/ECL82 project based on an old Mullard design. Look here.
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Old 9th May 2009, 05:44 PM   #7
aurche is offline aurche  Bulgaria
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Someone to say something other than the 10Kohm resitor on the anode of the triod in elc82 is a litle small?
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Old 9th May 2009, 05:48 PM   #8
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Its almost certain to sound fairly terrible. You need some form of negative feedback to make a pentode work well. Also the triode biases up to a very low voltage which makes grid overload a serious issue.
The ECL82 is slightly suboptimal for a RH84 implementation but if you want something to mull over go take a look at the "Could this be a Baby Huey killer ?" thread. If you want a single ended version then it can be split down the middle.

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Old 9th May 2009, 05:59 PM   #9
bigwill is offline bigwill  United Kingdom
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Who is aurche and why is he posting?
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Old 9th May 2009, 06:01 PM   #10
aurche is offline aurche  Bulgaria
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I am a friend of Alex, he doesn't understand english very well, so here i come in the picture.
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