High voltage vacuum tubes

A braze joint composition comprising in weight %, relative to the total weight of the braze joint composition:

• 54≤Cu≤95.5;
• 2.0≤Ge≤10.0 and optionally 0 to 5.0 of the sum of Al, Sn, In, Si, and B;
• 0.5≤the sum of Au, Pd and Pt≤30.0;
• and
• less than 1.0 incidental impurities,
• wherein the braze joint composition is configured to comprise a solidification temperature range of no more than 90° C. and a liquidus temperature in the range of 950° C. to 1060° C.;
• wherein the braze joint composition is configured to obtain a temperature difference between the solidus temperature and the liquidus temperature of no more than 40° C.

A braze joint composition comprising in weight %, relative to the total weight of the braze joint composition:

• 54≤Cu≤95.5;
• 2.0≤Ge≤10.0 and optionally 0 to 5.0 of the sum of Al, Sn, In, Si, and B;
• 0.5≤the sum of Au and Pt≤30.0;
• and
• less than 1.0 incidental impurities,
• wherein the braze joint composition is configured to comprise a solidification temperature range of no more than 90° C. and a liquidus temperature in the range of 950° C. to 1060° C.

A braze alloy composition comprising in weight %, relative to the total weight of the braze alloy composition:

• 54≤Cu≤95.5;
• 2.0≤Ge≤10.0 and optionally 0 to 5.0 of the sum of Al, Sn, In, Si, and B;
• 0.5≤the sum of Au and Pt≤30.0;
• and
• less than 1.0 incidental impurities,
• wherein the braze alloy composition is configured to comprise a solidification temperature range of no more than 90° C. and a liquidus temperature in the range of 950° C. to 1060° C.

A braze alloy composition comprising in weight %, relative to the total weight of the braze alloy composition:

• 54≤Cu≤95.5;
• 2.0≤Ge≤10.0 and optionally 0 to 5.0 of the sum of Al, Sn, In, Si, and B;
• 0.5≤the sum of Au, Pd and Pt≤30.0;
• and
• less than 1.0 incidental impurities,
• wherein the braze alloy composition is configured to comprise a solidification temperature range of no more than 90° C. and a liquidus temperature in the range of 950° C. to 1060° C.;
• wherein the braze alloy composition is configured to obtain a temperature difference between the solidus temperature and the liquidus temperature of no more than 40° C.