I soldered two short wires to the mic cartridge and mounted the telephone microphone into an old CB microphone case with a piece of sponge rubber in there to hold it in place works great. I have NEVER had the telephone microphone lock up or jam where you have to rap it on the table to get it to work all the others did that. I have tried several surplus carbon microphones and aviation ones etc. I recommend using a carbon telephone microphone out of an old telephone I got mine from an old Bell system dial desk telephone purchased at a yard sale it was in terrible condition but the MIC was OK anyway the telephone microphone cartridge from the handset gives full modulation with very good audio. I have resurrected my original first station with a TBS-50 that I restored and another old BC-348 RX and home brew tube converter for 6. I operated low band CW and 6 meters with the Harvey Wells TBS-50 for years. My first rig in 1958 was a harvey Wells TBS-50C purchased with a BC-348 WW2 surplus receiver,3 element beam, 50 feet of RG-8 coax and an International Crystal converter for 6 meters all for $75.00 a lot of money for a 16 year old in 1958 My brother Jim (K9YCA) and I still talk about taking down the beam after I bought the rig it was on a two story house and we took it down in a snowstorm ! my brother almost fell off the roof !. The mod only required 300 volts for the VFO provided from a separate source. Magnificent sound on the air with NO clicks or chirps whatsoever after this mod. Great memories, all-purpose radio, and the AC supply had a separate plate transformer which allowed for plate primary keying. The receiver (National NC125) my father got me is also in working condition. I watched the radios being made and it was a fascinating experience.I picked up the matching VFO while I was there, and still have the combination in working order along with the APS-50 AC power supply. I had become friendly with Harry Perssons, the Sales Manager, and often visited the factory in Southbridge, MA. AM Mobile was a challenge, but the rig stood up amazingly well to the rough treatment. During the peak sunspot cycle I quickly worked DXCC on 14 CW after solving a bad key click problem, and then mounted the rig mobile with a PE101C surplus dynamotor. ![]() Mods and copper screening cleaned it up, and an antenna tuner also helped. My first commercial transmitter was the TBS50D, which, without shielding or RFI attention quickly got me the "WAC - worked all channels" award for TVI. I was one of two radio hams on the sales floor, and had just turned 16. I was working for Store #1 (in Boston) of Radio Shack in the mid-50s before the Tandy buyout.
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