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Old 4th May 2004, 05:39 AM   #71
navin is offline navin  India
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dave, just when i was hoping to build a parallel push pull sing El84s you suggest that one should not use multiple tubes atleast not more than 2 (PP).
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Old 4th May 2004, 06:13 AM   #72
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Quote:
Originally posted by navin
just when i was hoping to build a parallel push pull sing El84s you suggest that one should not use multiple tubes atleast not more than 2 (PP).
Sorry... but no 2 devices are ever quite the same, so when paralleled you get their average. But everything is a tradeoff -- if you need more power maybe a meatier tube (ie EL34)?

That said, i've heard some amps with paralleled output devices, one just wonders how the same amp would sound with half the tubes.

dave
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Old 4th May 2004, 01:30 PM   #73
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Default its all how you look at it........

High efficiency is great, but it is usually required when something else is a hog. The example in the first post refers to an 8 watt amp. What is the efficiency of that thing? So high efficiency speakers are required because we want Class A, with little heat, and a small electric bill....... A great man once said "All things are relative", or wait, was it "All things are invarient"???????????
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Old 4th May 2004, 07:20 PM   #74
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Quote:
Originally posted by planet10


If that comment is aimed at the comment in my post -- i don't consider that a generalization, but a fact of life.

dave
The "problems" with sound quality are entirely in the ear of the beholder. It might be more difficult or more expensive to build an amp of a given "quality" with higher power output, but that is not quite the same thing.

How does the Aleph-X fit into your model?
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Old 4th May 2004, 07:33 PM   #75
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How does the Aleph-X fit into your model?
The one that Nelson is building for First-Watt may well be the best sounding one (20W -- so it will likely be a pair of devices in full Class A differential -- a subspace of PP)

dave
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Old 4th May 2004, 07:55 PM   #76
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If you see an acronym other than RMS power, walk away from the product. The maker obviously has no scruples and would sell dehydrated water to his own mother.
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Old 5th May 2004, 04:48 AM   #77
navin is offline navin  India
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Quote:
Originally posted by planet10
Sorry... but no 2 devices are ever quite the same, so when paralleled you get their average. But everything is a tradeoff -- if you need more power maybe a meatier tube (ie EL34)?
That said, i've heard some amps with paralleled output devices, one just wonders how the same amp would sound with half the tubes.dave
1. I did consider 2 x EL34 instead of 4 x EL84 but i was told that 4x EL84 sounds better.

2. i figured to control biasing using a SS biasing ckt so that all 4 tubes are biased to the same degree
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Old 5th May 2004, 12:45 PM   #78
markp is offline markp  United States
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Quote:
Originally posted by navin


1. I did consider 2 x EL34 instead of 4 x EL84 but i was told that 4x EL84 sounds better.

2. i figured to control biasing using a SS biasing ckt so that all 4 tubes are biased to the same degree
I've found that 4 x EL84s have just slightly more detail but 2 x EL34s have better bass response. You must bias individually to do it right in a multi pair PP.
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Old 6th May 2004, 04:12 AM   #79
navin is offline navin  India
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my el84 amp will be used above 300hz or so. my plan is to have a bi amp system running about 300-400hz (near BSC) and use the gain of the amp tom compensate for baffle step. the bass amp will be a SS. See the India Group Amp Project on this forum for details on that. the 2 amps will then feed 2 wide range drivers (jordan 125/53 or Fostex 165/83 or such) via a PLLXO.

so far the only part i have nailed down is the amps (EL84 PPP + Group amp). I still have to nail down the drivers, box size, etc...

the object of this speaker is that is must compete with the life style offerings from B&W, KEF, Dali etc...so the box cant be very large....if there is a box that is :-)
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