[rollei_list] Re: Wanted to Buy Macintosh SE/30
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 17 Sep 2006 17:16:04 -0700
Richard,
Do you mean to say that the MacIntosh 275 that I bought from
my company's surplus store for $20 is a good deal? A case of assorted
tubes (valves) came with it. I would have thought that my pair of
Marantz 9s were superior, but WTF do I know.
Jerry
Richard Knoppow wrote:
> ----- Original Message -----
> From: "Javier Perez" <summarex@xxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Saturday, September 16, 2006 8:28 PM
> Subject: [rollei_list] Re: Wanted to Buy Macintosh SE/30
>
> > Did you know that Apple had to license the Mac's name from
> > McIntosh labs?
> > Some of the computers even say so on the back. I love
> > audio macs!
> > Javier
> >
>
> Frank McIntosh's secret was a patented method of winding
> the transformers to achieve close coupling (necessary for
> Class B amplifiers) without high interwinding reactances
> (cause distortion). He came up with the idea of bifilar
> winding, that is, both windings were made at the same time
> with the wires next to each other. I don't have the patent
> number. The split load idea was not new, you will find it in
> some older engineering books. It was used in the British
> made Quad amplifier before the McIntosh. His other secret
> was very high quality construction using the best components
> available.
> When I was in college I sold Hi-Fi part time. I was able
> to compare McIntosh directly to other amplifiers and it blew
> them away; I was astonished at how much cleaner they sounded
> than some other, very highly reputed, amplifiers. I also had
> a chance to compare one to a Marantz 8-B on the bench. The
> 8-B has inadequate power supply capacity and goes banannas
> when overloaded, all sorts of junk shows up. The Mac just
> produced clean square waves.
> Transformer coupling is a practical necessity for vacuum
> tube audio amplifiers, however its not for solid state
> circuits. Macintosh continued to use transformer coupling in
> their solid state amplifers because the transformers were
> their claim to fame. There was probably an advantage to
> being able to use matched components for the output but
> transformerless amplifers have many advantages and better
> quality unless the transformer is of unusual quality.
> My hearing is no longer good enough to allow me to
> pronounce on audio components but when it was I was not a
> vacuum tube advocate: I lived with vacuum tube stuff for too
> long to be enamored of its aging problems.
> BTW, I am in the last stages of restoring two vacuum tube
> short wave receivers of the sort known as boat anchors.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
> ---
> Rollei List
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