This circuit for 6 lamps was found in old American documentation. The supply is of high voltage and the current drawn is very low.
This circuit was found in old documentation, appearing in several ways in this section. PUTs are...
This is the circuit of an old commercial amplifier from Fapesa (Philips Argentina) from the 1970s....
This amplifier for FM antenna signals was published in Radio Electronics magazine in May 1963....