Miniaturized electronic tubes 3740

On Sun, 04 Jun 2006 06:10:24 GMT, Jitze Couperus

Those are different than what myself and (I think) the OP was referring to. The peanut tubes had a set of 4-5-6-maybe7 in-line wires (about 24 ga.) coming out the base -- for direct-solder-in to the circuit board. They were about 0.5 inch (about 1 cm) in dia. and about 2 inches (about 5 cm) long. Some had a conductive (silver?) coating applied to the outside of the glbutt for shielding purposes.

The acorn tubes (like you referenced) were used mostly for VHF and UHF (with 'difficulty') applications from the mid-1930's through WW-II. The strange lead arrangement was designed for minimal interaction between input and output elements. I still use them. :-) An old Millen Grid Dip Meter I have (and LOVE) uses an acorn tube for the oscillator.

Again, the ceramic was as much for the high frequency application as it might have been for heat 'problems'.

I have some of both the peanut tubes and the acorn tubes. The peanut tubes I salvaged out of some early-1950's era railroad,

What you said. Except I don't believe the acorn tubes were used much (if at all) in walkie-talkies. The current draw for both filament and plate would have been excessive in that application.

Jonesy -- Marvin L Jones jonz W3DHJ linux

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		Miniaturized electronic tubes 3740 On Sun, 04 Jun 2006 06:10:24 GMT, Jitze Couperus Those are different than what myself and (I think) the OP was referring to. The peanut tubes had a set of 4-5-6-maybe7 in-line wires (about 24 ga.) coming out the base -- for direct-solder-in to the circuit board. They were about 0.5 inch (about 1 cm) in dia. and about 2 inches (about 5 cm) long. Some had a conductive (silver?) coating applied to the outside of the glbutt for shielding purposes. The acorn tubes (like you referenced) were used mostly for VHF and UHF (with 'difficulty') applications from the mid-1930's through WW-II. The strange lead arrangement was designed for minimal interaction between input and output elements. I still use them. :-) An old Millen Grid Dip Meter I have (and LOVE) uses an acorn tube for the oscillator. Again, the ceramic was as much for the high frequency application as it might have been for heat 'problems'. I have some of both the peanut tubes and the acorn tubes. The peanut tubes I salvaged out of some early-1950's era railroad, What you said. Except I don't believe the acorn tubes were used much (if at all) in walkie-talkies. The current draw for both filament and plate would have been excessive in that application. Jonesy -- Marvin L Jones jonz W3DHJ linux Tokenring vs Ethernet 10 years later 3741 Charles Mills re: years later microchannel 16mbit t-r card were going for something like $900-card aggregate 16mbit t... List \| Previous \| Next



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