Yes they did drift, the problem was greatly reduced with the introduction of the 901C and 901D oscillator, which was a completely different design, no germanium transistors at all. It was based on a design that was licensed from ARP and had been used in the Minimoog. On Thu, May 11, 2017 at 11:31 AM, W2HX via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Interesting discussion. I was just reading on Wikipedia about Keith Emmerson (of Emmerson lake and palmer and others) and his use of the original moog and its successors. He noted that the thing drifted terribly in frequency with changes in temperature. He noted that they would tune it up and by the time the place was full with an audience the warmth of their bodies would put it out of tune. All neat stuff! Eugene W2HX
-----Original Message----- From: vcf-midatlantic [mailto:vcf-midatlantic-bounces@lists. vintagecomputerfederation.org] On Behalf Of William Dudley via vcf-midatlantic Sent: Thursday, May 11, 2017 10:33 AM To: vcf-midatlantic Cc: William Dudley Subject: Re: [vcf-midatlantic] Semi OT 1970 Robert Moog radio interview
Bob Moog taught a class at Cornell University at this time, which I took (1972?). He was a Cornell grad (1965) and of course his factory and home were in nearby Trumansburg, NY.
His class was about "the acoustics of musical instruments" -- he "deconstructed" the sound of various instruments into the frequency and amplitude of the harmonics of each sound -- the concepts obviously were important if you wanted to synthesize, say, a plucked string with a Moog, you needed to know what the harmonics were doing as a function of time, so you could program the voltage controlled filters.
Bob's circuit designs as used in the original instruments were extremely clever. Despite having the best "tube" education that money could by, Bob fully understood transistors, and how they are NOT tubes, and how to take advantage of their unique properties in circuits.
Bill Dudley
This email is free of malware because I run Linux.
On Wed, May 10, 2017 at 11:56 PM, Matt Patoray via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Hi all,
I have recently come into possession of the master tapes for a radio interview with Dr. Robert A Moog, inventor of the voltage controlled synthesizer that carries his name. I have transferred the interview from the original 2 track 7.5 IPS reel to reel master tape. If anyone is interested in hearing the interview please drop me a line.
Only Semi OT because late 60's Minicomputers such as the DEC PDP-8/e where often used in large electronic music studios to control patching of large synthesizers. And of course later on Microprocessors such as the Z80 and 80186 where used to control machines such as the Prophet 5 and the Rhodes Chrome, then there was the Aphpasyntauri that used an Apple II/II+ as its driver. And who could forget the Fairlight CMI, the sampler/synth literally called the Computer Musical instrument, which Bob Moog demoed around the US and sold.
-- Matt Patoray Owner, MSP Productions KD8AMG
-- Matt Patoray Owner, MSP Productions KD8AMG