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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <email@example.com> <firstname.lastname@example.org> <3DKC9.467$Lq.email@example.com>
Subject: Re: Class B amplifiers: what are the large low-value resistors for?
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Date: Thu, 21 Nov 2002 19:12:43 -0000
NNTP-Posting-Date: Thu, 21 Nov 2002 19:12:51 GMT
N. Thornton wrote:
> "Kevin Aylward" wrote in message
>> Phil Allison wrote:
>>>> I meant *real amplifiers*:-)
>>> ** You know what that is do you ? I doubt it.
>> Oh...I think so.
> Here we go...
>>> It sounds like a right silly idea, probably
>>>> because it was done 30 years ago when they didn't know any better.
>>> ** No arrogance is beyond you is it ?
>> It is a daft idea to have no bias (quad dumper and such like
>> excluded). I am sorry if you consider this arrogance. If it were a
>> good idea, it would be done more often. Essentially, it is never
>> done. I agree that no bias saves the manual pot setting, but this is
>> something better lived with than having the outputs cut-off.
> There are always niches for these sort of things. My unbiased amp
> certainly did the job nicely. But never would I expect you to agree.
In the 60's, if I was gigging then, but I was only 7 in 1965, I might
have bought one as well.
>>>> still remember using 100 watt transistor amp modules that used a
>>>> driver transformer because the designers were too daft to realise
>>>> that the product did not have any glass in it.
>>> ** Unlike yourself no doubt who has too many glasses in him.
>> Look, we all make silly mistakes in our lives, pretending otherwise
>> is just as daft. Some tube designers of the past moving into
>> transistor design simply could not get their act together. They took
>> approaches which had no technical justification at the time.
> I think you'll find there were reasons for what they did. Now parts
> have very different costs, expectations are different, and technical
> knowledge has moved on a whole lot from 30 years ago.
But in this particular case, it really was just a case of not being
familiar with the existing technology at the time. To wit, I also used
their next amp module that did not have the transformer, i.e. they
cottoned on a bit.
> And it should be obvious that arguing with Phil is going to go
> nowhere. If you don't agree with him you will be ad hominemmed and
> non-sequitured to death. And if that doesn't work, who knows, you
> might even be accused of something suspect. I wouldn't bother.
Anyone would have thought it was him that designed the bloody thing and
therefore felt personally insulted.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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