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Old 29th January 2006, 10:51 PM   #31
Giaime is offline Giaime  Italy
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Thank you so much Ian. So I think I have to tweak it a little bit to adapt the operating point to my specific B+
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Old 29th January 2006, 11:30 PM   #32
ilimzn is offline ilimzn  Croatia
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Quote:
Originally posted by SY
Actually, my question was about using pentodes for the input tubes, since the desiradata there are high plate resistance and high mu. Seemingly, they would work better than triodes for this application.
Definitely agreed, even though pentodes are not 'en vogue'
The EF86 is an obvious choice... though it would be intereesting to dabble with the less glorious EF80, EF184...
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Old 29th January 2006, 11:58 PM   #33
AJT is offline AJT  Philippines
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Quote:
It is actually very simple, and elegant - and once you have figured it out, like most elegant designs, obvious
thanks, very informative for a noob like me.


Quote:
Originally posted by ilimzn


Definitely agreed, even though pentodes are not 'en vogue'
The EF86 is an obvious choice... though it would be intereesting to dabble with the less glorious EF80, EF184...
how about the 6ba6/EF93 pentodes? i still have a bunch of them.
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Old 1st February 2006, 12:53 PM   #34
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Default Ultralinear at which %?

for EL84 PP, what kind of UL tapping is nice in this case? Lundahl gives 33%, Hammond gives 40%... Yet some use 43%

thx!
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Old 1st February 2006, 12:56 PM   #35
Giaime is offline Giaime  Italy
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There's a precise relation between output power and distortion and the ratio of the UL tap. A relationship that I can't remember at the moment
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Old 1st February 2006, 01:04 PM   #36
SY is offline SY  United States
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Here's an imprecise relation, swiped right off the Mullard datasheet for EL84- 30% tap gives more power, 43% tap gives lower distortion.
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Old 1st February 2006, 01:38 PM   #37
EC8010 is offline EC8010  United Kingdom
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I think you mean 20%.
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Old 1st February 2006, 01:48 PM   #38
SY is offline SY  United States
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I need to drink more coffee.

Yes, 20% maximizes power.
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Old 1st February 2006, 04:11 PM   #39
Giaime is offline Giaime  Italy
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Coffee is bad Stuart, it hurts. Better drink more wine
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Old 1st February 2006, 04:48 PM   #40
ilimzn is offline ilimzn  Croatia
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Quote:
Originally posted by SY
Actually, my question was about using pentodes for the input tubes
You know, I have a couple pairs of those odd PFL200 signal/power dual pentodes with a decal socket, and the more I look at them, and this thread, the more I keep thinking: lower B+, lower power, perhaps about 4W max, pentode operation... who knows
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