This module is a working 5-NB board manufactured and sold
by RL Drake as an optional accessory for their SPR-4 receiver. If you own
a Drake SPR-4 receiver, you know that it is a great classic receiver
dating from 1968 to 1979 and was Drake's first fully solid state general
coverage receiver. Its capabilities are legendary and collectors of vintage
equipment relish the SPR-4 as a very sensitive receiver. The RL Drake Company
did not offer a lot of accessories with the SPR-4, but did make calibrator and
noise blanker modules available to enhance listening. In addition, they
sold extra crystals to expand the bands available for the user to tune into more
frequencies than the factory supplied crystals. We offer these optional
crystals for sale here on Ebay whenever they are available to us:
https://www.ebay.com/itm/390332441012 (please
copy and paste this link into your internet browser)
This module is the 5-NB noise
blanker that can be installed in a matter of minutes by any non-technical
person. You merely remove 6 screws to take off the top cover, remove the
jumper cable from the 5-NB inputs on the chassis of the receiver, and then gently
push the noise blanker board into the socket. After replacing the top
cover, the noise blanker is installed and ready to use by turning on with the
front panel selector.
This 5-NB comes with a copy of
the installation directions and this also includes a schematic of the 5-NB
circuit.
Drake noise blankers work
better than many other noise blankers installed on other receivers of that era.
The 5-NB will not get rid of all noise, but will greatly reduce man-made
noise coming from pulse sources found from household wiring, fluorescent lamps,
lamp dimmers, etc. It will also work on noise that comes from car
ignition systems, but will do little to improve random noise generated by
atmospheric conditions.
This 5-NB is not easy to come
by as it was not a cheap module when originally sold. By installing it in
your SPR-4, you can more fully equip your receiver to achieve full operational
standards.
Please use the Ebay shipping
calculator to determine your shipping cost. This cost includes proper
packing materials for safe delivery and insurance cost against damage or loss.
Those buyers living outside the
USA are also welcome to purchase from us. We have shipped to 112 countries during the past 24 years on Ebay and we are happy to ship virtually
anywhere in the world. You may use the shipping calculator to determine
your shipping cost via either priority or express mail.
Please keep in mind that this cost
may not include any import, customs, or VAT fees. If you are uncertain of
these costs, we ask you to check with your local post office prior to making a
purchase from us. Thank you!
Thank you for taking the time
out of your busy day to look at our Ebay items!