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Best Tube-Type Transceiver?
Irv Finkleman wrote:
Scott Dorsey wrote: reseauplate wrote: Failing that, converting the beasts to a transmitting tube of some sort seems the only way to go,as sweep tubes are a thing of the past. Apparently they take a lot of different internals from audio types, which are the market today. Yes, I grew up watching folks changing old surplus military gear to take cheap commercial sweep tubes. Now I am watching people converting cheap commercial gear to take surplus military sweep tubes.... --scott I converted my old Hallicrafters SR150 from sweep tubes (6DQ6's if I recall) to 6146s. It is still around the local ham community and running fine. The nice things about the 6146's was that they are small enough to fit in almost any PA subchassis, and all I had to do was rewire the sockets. Sure wish I still had it. I let it go about 25 years ago! Irv VE6BP TV sweep tubes don't like to be run linear. I recall seeing a 16 x 6LQ6 amplifier in the Handbook (or was it QST?) eons ago. I shudder at the thought of the IMD3 response! 6146s are a bit better than sweep tubes. My favorite tube in terms of linearity would be the 807/1625, albeit a bit taller than the others. I still have my first SSB xcvr, a new-to-me SB102. I would concur with most of what others have said about the cheesy mechanicals. Even with fresh tubes in the frontend & IF and aligned, the receiver seemed to fall off in sensitivity above 20m. 3 elements on 15m at 38' made up for it. I added a Fox-Tango Club 500Hz CW filter before retiring it. 73, Bryan WA7PRC |
#2
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Best Tube-Type Transceiver?
Bryan wrote:
Irv Finkleman wrote: Scott Dorsey wrote: reseauplate wrote: Failing that, converting the beasts to a transmitting tube of some sort seems the only way to go,as sweep tubes are a thing of the past. Apparently they take a lot of different internals from audio types, which are the market today. Yes, I grew up watching folks changing old surplus military gear to take cheap commercial sweep tubes. Now I am watching people converting cheap commercial gear to take surplus military sweep tubes.... --scott I converted my old Hallicrafters SR150 from sweep tubes (6DQ6's if I recall) to 6146s. It is still around the local ham community and running fine. The nice things about the 6146's was that they are small enough to fit in almost any PA subchassis, and all I had to do was rewire the sockets. Sure wish I still had it. I let it go about 25 years ago! Irv VE6BP TV sweep tubes don't like to be run linear. I recall seeing a 16 x 6LQ6 amplifier in the Handbook (or was it QST?) eons ago. I shudder at the thought of the IMD3 response! 6146s are a bit better than sweep tubes. My favorite tube in terms of linearity would be the 807/1625, albeit a bit taller than the others. I rebuilt an RCA TTU-25B 25 KW UHF TV transmitter about 18 years ago. It had 17 6146 tubes in the video modulator. What a pain in the ass to match 16 6146 tubes for the output stage. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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