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Small Tube Amp
- Thread starter Mudfoot
- Start date
Beware, just like all the other sweep tubes the Russian EL-509 used in those amps is no longer in production and sell for over $80 a piece today. To add to the confusion, another tube was recently developed for audio use with no anode cap for RF use and it also carries the old EL-509 part number.
Unless it's coming from a top notch builder I'd skip most tetrode amps. Too many extra areas the builder could easily make mistakes in when compared to a grounded grid triode. Anything from the "I don't need to neutralize a high gain tetrode" to "who needs a shunt regulator on the screen grid" mentality quickly compromises the reliability and stability of many tetrode amps.
I believe the EL519 uses a higher filament voltage than the 6.3 volts used on the EL509. Other than that, the tubes are the same.
I was just wanting something unique. Thought maybe there was an obscure builder out there that had something useful for 10/11 meters.
