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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: I challenge you to publish your measurents of that rolloff! posted by fatbottle on September 30, 2004 at 01:40:41:
> I'll make a guess , 15Hz-20kHzI'm not interested in your guess and neither are other innocent readers that might mistaken you for an "authority" on the subject.
Try 12Hz to 80KHz at 10 watts into 8 ohm, which I measured on the particular amp only a few weeks ago with a real scope and signal generator. Not only fresh in my memory, but also written on real paper.> The coupling caps are too small for a start
Too small? Your own "guess" was 15 Hz on the low side, what's too small in that?!
By the way, the math fully agrees with you and with the measured bass rolloff. 47K plate load plus 100K grid/bias load in series with 0.1uF yields a rolloff at 11 Hz. I measured 12Hz!> Anecdotal evidence is all you have so far , so get your scope out and try to prove me wrong !
Sorry to disappoint you.
The scope was out and all my quotes are from REAL MEASUREMNENTS.
Perhaps you should get your scope out and be more careful to not mislead people with blank statements about something you don't know for sure and apparently someone else does.
There is no anecdote or guess in my statements - all HARD EVIDENCE. So, I'm asking again - where are YOUR REAL MEASUREMENTS?If you neglect to measure, at least offer a theoretical analysis of some sort. If you can't do that, then offer us circuit simulation results. Takes only a few minutes to simulate my circuit on HSPICE (which I did!).
I have nothing against your cascode diff amps but I have a lot against your blank statements with nothing behind them regading my circuit. If you had measured it or listened to it and then debate facts, I might have paid more attention. So far all I hear is "your guess"!
Do you have any clue how many engineering projects fail because someone guesses instead of doing the job right?!
Sorry, not interested!
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Follow Ups
- Your guess is wrong and you are evidently NOT an authority on the subject - serus 08:51:50 09/30/04 (8)
- Who said I was an authority on the subject , just informing of past findings(nt) - fatbottle 09:48:37 09/30/04 (0)
- Oh dear , I've upset him - fatbottle 09:45:26 09/30/04 (6)
- Not really, just pointing out your empty claims - serus 12:06:28 09/30/04 (5)
- Sorry , methinks you're pulling my chain - fatbottle 13:12:22 09/30/04 (4)
- Quite frankly I expected you to say that you don't believe... - serus 14:47:55 09/30/04 (3)
- Re: Quite frankly I expected you to say that you don't believe... - fatbottle 15:04:12 09/30/04 (2)
- Let it go, my friend... - serus 15:40:22 09/30/04 (1)
- Scope ? - fatbottle 02:25:17 10/04/04 (0)
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