Notes on the writing assessment pilot July 29,
Color artwork of the Grebe MU-1 from the advertising brochure For decades, vintage radio collectors have rated the Grebe Synchrophase MU-1 as one of the best, if not "the best," Battery-operated TRF-Neutrodyne radio receiver from the mids, with performance that is matched with timeless styling.
However, anyone that has taken a close look at more than a few Grebe Synchrophase MU-1 receivers has surely noted that there are some significant differences between the various MU-1 receivers produced.
This article will attempt to catalog as many upgrades as possible with explanations as to their purpose. This article will also assign a chronological order to the upgrades so the Synchrophase owner might be able to date when his radio was built from certain easily observable construction details.
Also, we will attempt to decipher Grebe's serial letter methods so that dating by this combination of letters may become possible in the future this attempt has actually produced another interesting possibility for the serial letter codes.
A serial letter log has been started and this article will keep track of the information in that log.
As with all of our articles, we try to provide the most detailed and accurate information available. Here's an e-mail link. Grebe was born in and started in the "radio business" at a very young age. He was certainly selling various pieces of equipment he built to radio amateurs prior to WWI, he supplied a "submarine receiver" to the Navy during WWI and continued on building amateur radio receivers after WWI.
Grebe produced a series of ham receivers designated with a "CR" prefix followed by a number to identify the model. The CR receivers were very popular with the hams and, if a commercially built receiver is seen in a vintage photograph of an old ham station, it will more than likely be a Grebe "CR" receiver.
The amateur business was large enough that, byGrebe had a fairly large building for radio manufacturing. The general public's opinion was "why buy a radio, I don't know Morse.
The Broadcast Boom created an insatiable market for radios, Radio receivers that had previously been for radio amateurs were sold as broadcast receivers. Old radio companies like Kennedy, Adams-Morgan and others, that were primarily ham or experimenter builders, offered their radios as broadcast receivers.
The Grebe CR-5, a single tube receiver from Many accessories could be purchased from Grebe to improve the performance of smaller receivers like the CR Grebe marketed some of their CR receivers as broadcast receivers since they did tune around where the BC stations were transmitting.
The CR-9 was the most popular early Grebe CR receiver since it included a two-stage audio amplifier section in addition to the regenerative detector. Additionally, Grebe later offered the CR and the CR as Broadcast Receivers but they still retained the round black dials and the same circuit of the earlier CR receivers, that is, regenerative detectors with a couple of stages of audio amplification.
Bythere were hundreds and hundreds of companies building radios. Many of the radios produced were basic designs that functioned adequately but were not innovative since the companies were small owner-engineer operated concerns that didn't have the financial ability to become competitive.
Grebe however was already a major manufacturer and, in earlyit was decided that a radio specifically designed for Broadcast reception was something the company should provide to the radio enthusiasts.
The Synchrophase was born out of Broadcast Boom but was really not marketed during that period which ended around the beginning of By mid, radio buyers wanted great performance and easy operation.
Grebe had some top engineers that designed a receiver that was made up of innovative components rather than a special circuit. Grebe components were built at the factory. They had their own bakelite molding facilities, their own screw machines, plating facilities, everything required to build first-class equipment.
The new Synchrophase's mechanical superiority was due to the experienced manufacturing ability of the Grebe company. Then there was the styling. The Synchrophase had to look like no other radio.
Grebe went for mounting the tuning condensers facing upwards with "on edge" dials that were surrounded by dull 24K gold covered and lacquered diamond-shaped escutcheons early models only.
When mounted on the faux grained dark red mahogany bakelite panel the effect was mildly Oriental in style but certainly striking and looked like no other radio on the market.
Finally, there was the performance. The new Synchrophase literally was the best performing non-superheterodyne radio available in The Synchophase was so popular, it was available from around August up to the summer of An incredibly long production life considering the rapid evolution of radio designs during the s.
Look at the schematic and you'll notice the feedback capacitors Grebe called them "balancing condensers" from the plate to the grid on the two RF amplifiers. The only problem was the Neutrodyne circuit was owned by the Independent Radio Manufacturers who had paid Louis Hazeltine to design it exclusively for them.
So, here was Grebe, not an IRM member unless you were one of the eleven founding companies, you couldn't be a member and he was building a Neutrodyne.Writing for Army Leaders.
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P.O. Box 8Services and Facilities San Diego, CA Russell V. Stephenson passed away on March 13, at the amazing age of He had been living in an assisted living facility in Salem, Va. since the passing of his beloved wife Vivian in April of The Army National Guard Selected Reserve Incentive (SRIP) Policies (specific policy applicable to each Soldiers contract shall be referenced) Recruiting, Instructor and Broadening assignment options.
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