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Old 19th January 2007, 07:33 PM   #1
nhuwar is offline nhuwar  United States
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Default driving your power stage

Is it a horrible thing to drive you power tube's with solid state.

Nick
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Old 19th January 2007, 07:41 PM   #2
SY is offline SY  United States
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If so, I'm doing a horrible thing. So is tubelab, who uses a very similar approach.
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Old 19th January 2007, 07:53 PM   #3
nhuwar is offline nhuwar  United States
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Cool I wanted to make sure I won't get kicked out of the forum if I did
I was thinking about using an TI amp chip to run each channel
the only thing Is it has a 4 ohm out so I would have to use a output transformer in reverse.

Now would that raise eyebrows?

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Old 19th January 2007, 07:55 PM   #4
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It idepends on what kind of solid state device you use.
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Old 19th January 2007, 07:59 PM   #5
nhuwar is offline nhuwar  United States
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TPA0172PWP Is what I was going to use.

Nick
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Old 19th January 2007, 08:03 PM   #6
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Quote:
Originally posted by nhuwar
TPA0172PWP Is what I was going to use.

Nick
It will work. The tube will amplify this amp's distortions and add own coloration.

This approach is used in some homebrew AM transmitters to drive plate modulators, when solid state power amp drives output toobs through inverted P-P output transformer.
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Old 19th January 2007, 08:08 PM   #7
nhuwar is offline nhuwar  United States
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At max power 20khz it only produces 1%thd thats well bellow the audible range of humans 15%thd.

I didnt think that was to bad but if it wolud make the amp noisy I'll look for something else.

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Old 19th January 2007, 09:17 PM   #8
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Quote:
Originally posted by nhuwar
At max power 20khz it only produces 1%thd thats well bellow the audible range of humans 15%thd.

I didnt think that was to bad but if it wolud make the amp noisy I'll look for something else.

Nick
Hey-Hey!!!,
I doubt your numbers. Especially with no description of the spectral content. There will be a distinct difference in the audibility threshold depending on odd v. even, and what the decay with increasing order looks like.

I beleive you could probably pick out 1% if it were either all first even( 2nd harmonic ), or all third harmonic.
cheers,
Douglas
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Old 19th January 2007, 09:18 PM   #9
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Quote:
Is it a horrible thing to drive you power tube's with solid state.
Yes, despicable.
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Old 19th January 2007, 09:43 PM   #10
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Quote:
Originally posted by nhuwar
At max power 20khz it only produces 1%thd thats well bellow the audible range of humans 15%thd.


It depends on spector of distortions. Some distortions are well audible way below 1 percent.
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