Posts tagged ‘Carnegie Mellon University’
February 11, 2015
Here is a quick rundown of the equipment in the Grain Bin Studio. The speakers are Acoustic Research AR3a. The tape recorder is a four track Teac using quarter inch magnetic tape. To the right of the recorder is a hundred watt lunchbox amplifier designed by Stan Kriz. To the left is the meter head/power supply/headphone amplifier for the board. I built the mixing board by hand out of Aluminum stock. The electronics which is all rack mountable includes compressors, Stan’s 90db version of a dolby unit, reverbs, and matrixes. The center section originally held the board at the left and then later held the Teac board. the red back board is from a Three Rivers Computer booth. The tall rack holds the WRCT green machines that provided late night music. Originally it was a data logger from the Pittsburgh airport. The small rack is the six track recorder, Ampex deck and electronics. The poster is a Maxfield Parrish that hung in the original CMU studio.
February 10, 2015
The CMU Fine Arts recording studio primarily recorded recitals in Exhibition Hall and made audition tapes for the music students. But when the musicians played at Pittsburgh’s Carnegie Music Hall or the Carnegie Lecture Hall in Oakland, we also recorded there. One night, we were asked to record a harp recital for Marcella Kosikova and she asked if we could carry her harp on and off stage between pieces so she could retune it. Since we had friends that did silk screening, we created the Ace Harp Movers shirt with the logo “You pluck it, We truck it”. Marcella received one of the shirts and was very pleased and I understand shirts with the logo were seen around the Carnegie Mellon campus for many years after our initial run.
February 9, 2015
Here is a quick story about the 1969 Rolling Stones Tour. I was working for the CMU Computer Science Department in Porter Hall and living with two engineers Bob Nickau and Roland Findlay. We knew Chris Langhart from the CMU radio station WRCT and when he was picked to do the sound for the Stones tour he called on Bob to handle the amplifiers because they were using solid state amplifiers for the first time. Five days into the tour, Bob called and asked me to join the crew. He said there was a ticket for me to Phoenix at the airport for the next morning and to travel light because I was carrying the oscilloscope. Since the banks were already closed, Roland opened the Porter Hall Coke machine and lent me a few rolls of quarters for spending money. I packed my things in my attache case and left for a really fun tour. The night I arrived the Stage Manager told me he was leaving the tour to work for Country Joe and the Fish and I would be in charge of the stage miking. That was my total apprenticeship for the tour. Chuck Berry and Ike and Tina Turner were also on the show. We got very little sleep because there was only one sound crew and a new concert in a different state each night. I didn’t care, this was the tour of a lifetime. The button in the photo was our back stage pass.
February 8, 2015
Nancy and I were married in 1979 and soon after we moved the CMU Fine Arts Studio to the basement of our house two blocks from CMU. We divided the basement into two rooms connected by a double glass window. We added a Teac board and a Roland piano. This was the last iteration of the studio before it moved to the grain bin at the Emlenton Mill. My friends Brian Rosen and Stan Kriz from the studio and I started Three Rivers Computer Company and soon we were all too busy with the company and children to play in the studio any longer.
February 7, 2015
The group at Carnegie Mellon’s WRCT radio station not only recorded classical music and produced Scotch and Soda records but also did live sound for concerts. The concert pictured was at Chatham College in 1972. Brian Rosen, who also mixed about a third of the famous Woodstock concert, headed up the sound reinforcement crew. He also worked for the CMU Computer Science engineering lab where we designed and built our mixing boards and power amplifiers. The board shown below was hand laid out with black crepe tape and then photographed and photo-etched in house and then hand soldered. Each of the nine modules was interconnected with a ribbon cable. The resulting twelve channel stereo board was only 3 inches deep and 19 inches high by 32 inches wide. The eight foot speaker columns were built in two sections, the bottom section having wheels. Each column was topped with a commercial horn speaker. The whole system was powered by four – hundred watt lunchbox amplifiers.
February 6, 2015
Scotch and Soda is the amateur theater group at Carnegie Mellon University. In the 1970s the group would produce one full length original musical each year. Each Spring the group would take over the Skibo ballroom and transform it into a theater. The stage was stored under the football stadium and had to hand carried in sections and rebuilt each year. WRCT and later our studio would provide sound reinforcement and a records (vinyl recording) of the production. The color photo shows Joel Wolensky recording the tracks for a recording of the show “A New Day” in the Fine Arts studio. Since the studio was located two floors above Exhibition hall he was linked using video. That’s a Crown of Elkhart two track recorder directly to his right. The six rack recorder and its electronics are to his far right. The black and white photo was taken in the Skibo ballroom as we recorded the band and chorus for the show “Festival” again using the six track recorder seen to the far right. The band is to the left out of the picture. The Sony recorder and the board to the far left were used for a simultaneous stereo mix.
As most of you know by now the Emlenton Mill burned last night. I plan to continue the blog and will include pictures of its last night in future posts. We want to thank the firefighters who braved the cold and ice and fire and everyone who has contacted us today. Thank you. We loved the Mill and will miss it.
February 5, 2015
By 1973, the CMU Fine Arts recording studio was recording 100 recitals a year as well as producing records for CMU’s amateur theatrical group Scotch and Soda known for the debut of the musical Pippin. Some of our best memories were recording a CMU Kiltie Band concert at Carnegie Music hall in New York and being part of the sound crew for part of the 1969 Rolling Stones Tour. For Scotch and Soda we designed a home made six track recorder using three sets of quarter inch stereo heads (nine heads in all) and half inch tape on an Ampex data deck. In its original incarnation for the musical Something Personal we only had two channels of record electronics which we would manually replug to switch between heads. Also pictured is a Revox two track recorder and a Teac four track recorder. We used Advent dolby units and Stan Kriz designed a special system that could encode 90db of audio on standard Scotch quarter inch tape and also control the speed of the recorder using a huge tube amplifier for pitch adjustment.
February 4, 2015
The Transicap condenser microphone was designed in the early 1970s by John Hain and Stan Kriz, engineering students at Carnegie Mellon University and members of the campus radio station WRCT. The mechanics were hand lathed by my father in his shop in Baltimore, Maryland. The diaphragm was made of vacuum spattered mylar stretched over a brass backplate mounted in an epoxy resin body. The backplate was threaded into the epoxy body so that it could be adjusted to the correct capacitive gap. The bodies were made of silver anodized aluminum. We developed special tooling for stretching the mylar and adjusting the capacitive gap. Two special black anodized Transicaps were built and subsequently dissapeared from Exhibition Hall at CMU. The core of the electronics was a small metal bodied nuvistor tube which required an external high voltage power supply. For this reason, the microphones used a four pin cannon connector between the microphone and the power supply. A standard three pin cannon connector was used between the power supply and the mixing board. We recorded Stephen Schwartz’s (Wicked) New York audition tape at CMU using Transicap microphones and a hand made mixer. My favorite story from the session was Stephen putting thumb tacks in a CMU upright rehearsal piano to make it sound like a harpsichord.
February 3, 2015
WRCT is the campus radio station at Carnegie Mellon University and in the late 1960’s Ken Lutz, a music major, decided to do a radio show based on recitals given in the Exhibition Hall of the College of Fine Arts. Since I was a technical drama major, I was familiar with the glass ceilings of CFA and I helped Ken by hanging the microphones to record the recitals. This entailed walking out over the two story glass ceiling on the mullions between the glass panes. In the process we discovered a way from the ceilings into an old fan room off the practice hall that had been locked for years. After some research and discussions with the Dean and the head of Physical Plant, both of whom thought the room belonged to the other, we were given a key and it became the music departments first recording studio. The picture with the record turntables is the WRCT studios in Skibo. The picture with the tape recorder was our first setup in CFA. In the 1960s, WRCT was mostly run by engineers and drama students. Between them they designed and built the equipment and created the content for the shows. Both the studio console and the small battery powered mixer shown were designed and hand built by the members of WRCT. Tomorrow, I will tell you about how we designed and built our own condenser microphones.