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#8
May 19th 06, 05:32 AM
posted to rec.radio.amateur.boatanchors,rec.antiques.radio+phono
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EA53 tube for HP410B VTVM?
COLIN LAMB wrote:
"Messed up probes are the #1 reason than many otherwise good 410Bs get junked, which is a shame." My response might offend the purists, but I can defend myself by stating that I am just an amateur. I hate throwing things out. And, I hate spending money on parts that cost more than the instrument. So, if I had an HP 410 that had a bad probe and I did not wish to invest in a new tube, I would find a tube that would fit into the probe and used the appropriate filament voltage. Even a triode can be used as a diode. The fact that the fitting of the tube might destroy the frequency response may not be a big factor. Heck, we usually only operate up to 450 MHz. Even if the calibration is not absolutely correct, it can be tested easily with a signal generator and calibrated with a calibration chart. What you end up is a ******* HP 410, which is still better than a broken one. I must admit that I have *******ized a lot of things instead of throwing them out. Some of the stuff I have works better than when it left the factory. Some does not. In each case, I have outsmarted the trash man. 73, Colin K7FM Have a look at Tubeworld http://www.tubeworld.com at They advertise NOS EA53 for $10 each 73 Lionel VK4NS |
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