Quote:
Originally Posted by Electronic M
If the triode was being used purely as a detector a diode with the right pinout will work....I had an Admiral with a type 76 triode detector that sometime in the 50s someone replaced the tube with a 5 pin base with a 1N34 soldered into the base....It worked fine like that and probably saved someone a week waiting for a tube to ship in.
Then again I've also seen dummies assume if the tube plugs in that it has to work... I forget the name but I had a 20s console that the owner who is a collector decided to plug a pair of type 80s into the output triode sockets.... and he wondered why it hummed so loud you could hear it down the block!...it used an odd ball triode type that was unobtainable so after consulting some datasheets I found IIRC the 6S4 was close enough (main difference was slightly better gain) and built plug in adapters for those. That set had GREAT volume after that. That set had a reputation for having powerful audio for a 20s set, but the guy that gave it to me (and later began to miss it and bought it back) who had a working table model version was even impressed with how loud and clear it ran.
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the 37 tube and the 84/6Z4 tube aren't even close to having the same pinout plus the 84 tube is a Full-Wave Rectifier Tube, whereas the 37 is a triode tube that was being used as a dectector and an AVC Diode so they cannot be used in place of each other.
I just think in the case of this radio it was someone who didn't know what they were doing just grabbed a tube that had the same pin arrangement(but wasn't the same pinout) and just stuck it in the radio and when the radio still wasn't working right just retired it to their attic because they didn't want to take it to a repair shop to have it repaired properly.
Look up the data sheets for the 37 and the 84 tube and you'll quickly see that the 84 would never be a suitable substitute for a 37 tube, completely different operating characteristics from each other.