I also find the NB-7 works very well for what it was intended, impulse noise, not static crashes. Be careful on your choice of a TR-7. A well cared for, recently “ gone through “ TR-7 is worth more than an unknown condition or basket case TR-7A. There is not enough difference to warrant the prices the TR-7A’s bring and not that much was done over the years in the way of circuit modifications. Regardless of the serial number they are all “ OLD “ radios and any TR-7 can give you the fits occasionally. Crystals drift, crystal filters also drift, LED displays weaken and fail, the wrong fingers find there way inside, etc. I currently own four TR-7’s of various serial numbers and they all work fine, but I also have the means and parts to keep them that way. Best of luck with your search, beware of eBay sellers as many of them are passing on radios they know nothing about or even take the time to clean the dust off of.
73, Gary http://home.roadrunner.com/~w8pu R-4A T4-X R-4B T4-XB R-4C T4-XC MS-4 L-4B RCS-4 2A 2B 2C 2NT 2CQ 2AS 4-LF TR-4 TR-4C TR-4CW/RIT RV-4C MC-4 TR-7 RV-7 CW-75 MS-7 WH-7 W-4 WV-4 MN-2700 MN-4C MN-2000 UV-3 PS-3 TR-22C TR-33C AA-10 AC-10 MMK-22 TR-6 PRN1000
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