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Old 12th January 2007, 09:26 PM   #11
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Well, that eases the weight issue, but you'll still have the issue of needing a transformer with a high turns ratio. That's not good for stability or bandwidth.

Given that this is a tube that needs noisy cooling and is not terribly linear, there are better design choices.
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Old 12th January 2007, 09:30 PM   #12
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at 1500 volts the z= is 1600 thats not to high
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Old 12th January 2007, 09:31 PM   #13
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I've just always been hung up on big power tubes thats all
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Old 12th January 2007, 09:37 PM   #14
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Is that 1600 for a single tube? If so, you need about 6400 for push-pull, which is pretty reasonable.

Now how are you going to manage cooling fan noise?
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Old 12th January 2007, 09:53 PM   #15
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yes I just rechecked the specs and the numbers per tube. I've also been contimpleting trying a 813 because 4 3-500zg costs $600.
I'm not as concered with fan noise becuase I was plannig on building the amp in a rack box and putting it in a sound proof rack cabinet that I have with nice 6" inch fans in the top.

So tell me this you get better low frequency responce from se or pp.

Nick
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Old 12th January 2007, 10:06 PM   #16
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If "better" means "more accurate," then push pull for sure. 5-10% distortion is not my idea of "accurate," and that's not an unusual number for an SE amp at lower frequencies.
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Old 12th January 2007, 10:40 PM   #17
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Ok correct me if I'm wrong 'now mind you I ask this just for sheer clarification though' two tubes in parallel cuts the impedance by half doesn't it
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Old 12th January 2007, 11:53 PM   #18
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Yes, that's right. I'm almost afraid to ask why this question.... (envisioning eight 3-500Z in push-pull parallel)
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Old 13th January 2007, 12:58 AM   #19
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Jezz if I had millions of dollars maybe but luckly no but could you amagine an pp ot that could handle 2kilowatts. Ya I'd say about 50 pounds of iron.

I'm thinken of a cheaper tube but you have cleared alot of things up so thank you.

I do have 1 more question though in the rf realm you it's easy to figuare you z because your frequency spread is narrow most of the time.

So in audio equpment is the z figuared for the higest frequency or the middle.

Really thanks for the help
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Old 13th January 2007, 01:11 AM   #20
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Audio, being broadband, uses things like transformers for impedance matching rather than stuff like pi networks. The nice thing about transformers is that they are inherently broadband (in a general sense). Also, the tube admittances are also relatively constant over the frequency span. So the load calcs are the same at 100Hz and 20kHz. Makes life easy, huh?
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