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Old 20th April 2008, 08:11 PM   #211
Studley is offline Studley  United Kingdom
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Quote:
Originally posted by Nelson Pass


Of the Zen and FW series, it would be the best, since it has a DF
of 80 and will drive 2 ohms without burping.

I don't believe, however that I would point it at a speaker with both
a low impedance and a low sensitivity.

Reactance is not an issue. The performance is slightly more robust into
a fully reactive load vs a resistive load of the same impedance.
Nelson
My Quad 989s go down to about 4 ohms and are probably 86 db. Would they be in the usable zone do you reckon?

BTW, I have a pair of DIY F4s, voltage gain courtesy of a valve buffer using some old 76 valves, volume controlled by a TVC. This set up drives the 989s with no difficulty and sounds just fab. The grass is always greener though . . .
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Old 20th April 2008, 08:42 PM   #212
dhole is offline dhole  United Kingdom
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I was thinking the toroidal for the F5 could be around 200VA 2 x 18v ?...is this big enough. What are people using ? Nelson ?

dave
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Old 20th April 2008, 08:52 PM   #213
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by dhole
I was thinking the toroidal for the F5 could be around 200VA 2 x 18v ?...is this big enough. What are people using ? Nelson ?

dave

hehe

for one channel - just usable
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Old 20th April 2008, 09:28 PM   #214
dhole is offline dhole  United Kingdom
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soooo 300VA up really per channel....
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Old 21st April 2008, 01:00 AM   #215
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Quote:
Originally posted by dhole


I was thinking the toroidal for the F5 could be around 200VA 2 x 18v ?...is this big enough. What are people using ? Nelson ?

dave



I would like to recommend to read ZV5 article.
It explains the concept and real size of the transformer in detail.
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Old 21st April 2008, 02:11 AM   #216
KSTR is offline KSTR  Germany
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If I got things right, we have, using some safety margin :

1.4A * 48V = 67W idle dissipation

plus about 140W R.M.S. for a 2 ohm load driven to the clipping limit (which means some 280 instant watts alternating between rails under worst-case assumptions): Pd(rms) = 0.5 * 24V^2 / 2R

A 300VA per channel looks OK to me, pretty much on the safe side.

- Klaus
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Old 21st April 2008, 02:15 AM   #217
flg is offline flg  United States
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I don't believe N.P. actually gave that much detail regarding the P.S.
He said 23-25V with the tested amp using 24V. And, should be rated at 6A continuos duty and more than 10A peak /ch. Although, that sounds more like 2ch's worth of power to me...
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Old 21st April 2008, 02:46 AM   #218
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Like you guys need help coming up with a power supply that
meets that description.

Poor babies...

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Old 21st April 2008, 02:54 AM   #219
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Quote:
Originally posted by flg




I don't believe N.P. actually gave that much detail regarding the P.S.




Letís try to see things in positive way.

In general, papa respects that we are not really children, without showing detailed figures. Therefore, he likes to focus more on essential concept and principle in his writing (detailed sometimes). Meanwhile, getting detailed figure for our purpose is an apportionment we need to tackle, based on the given principle.
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Old 21st April 2008, 08:25 AM   #220
Zayan is offline Zayan  Thailand
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Quote:
Originally posted by Babowana






Letís try to see things in positive way.

In general, papa respects that we are not really children, without showing detailed figures. Therefore, he likes to focus more on essential concept and principle in his writing (detailed sometimes). Meanwhile, getting detailed figure for our purpose is an apportionment we need to tackle, based on the given principle.

Totally agree.
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