I bought a DX-160 off eBay. Radio needs alignment but not bad. On the inside it look different than my other DX-160. I has a few braces that my other does not have. How do you find the date of manufacture?
I have the SN of it
The date code is usually on a small label on the rear panel or maybe on the bottom of the unit. The date code is in the form of number-letter-number which is the month and year of manufacture. For example, 5A4 would be the 5th month of the year. For a DX-160, the year would be between 1974 and 1980. After 2000, the year digit became two digits.
GRE COMMUNICATIONS RECEIVERS -- GRE History as OEM Manufacturer - 13 years
GRE has been manufacturing Communications receivers for International Customers as an OEM (Original Equipment Manufacturer) supplier. GRE Models have been very popular amongst radio manufacturers through-out the world. Beginning in 1965, GRE Started designing receivers for International markets. Thirteen years later, almost all standard communications receivers had adopted a RF amplifier single-stage, intermediate-frequency amplifier two-stage single-conversion superheterodyne method. Both vacuum tube type receivers and transistor (Germanium) receivers were used with vacuum tubes still regarded as being more reliable than transistor type receivers.
However, transistor types now have gained advantages with performance reliability (without significant frequency drift) with low power consumption.
Printed circuit boards used in the transistor receiver production process had a many advantages such as simplifying assembly steps to support large scale production. However, these printed circuit boards also brought disadvantages such as easily being damaged by heat, resulting in printed circuit board degradation. Special precautions were therefore required with printed circuit board work. As for the frequency dial indicator standard, we set its accuracy to a width of the dial needle for each frequency band. This is especially critical to support efficient production capability.
Scales of linear variable capacitors often fail to meet local oscillator frequencies. To correct this deficiency, GRE engineers had displayed a great deal of "craftsmanship" in making adjustments to each unit. After these special efforts in 1967 GRE began supplying RADIO SHACK (Tandy Corporation) with REALISTIC MODEL DX-150 receivers. Thereafter GRE expanded its entry into the communications receivers market joining other manufacturers such as HAMMARLUND, HALLICRAFTERS, HEATH KIT, NATIONAL. Adding some periodic performance enhancements, GRE was proud to continue support the DX-150 Receivers for some thirteen years later.
The audio ic was changed from upc20c to upc575c2 on sets made after April 20 1975 (date of the second edition service manual). Both manuals are available at www.ebaman.com (early edition manual has a *corrected* schematic that fixes a typo in the copy found elsewhere).