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This CV1075 is a late (1960s) version of the famous KT66. The electrode structure is slightly different and the carbonized wash on the inside of the glass has been omitted. Note the thick copper grid supports with cooling fins at the top, essential to stop the grid wires getting hot enough to emit electrons.

The figures given are for single ended use, but a pair run in ultra linear AB2 push pull will deliver 50 Watts with 2% distortion. It is not uncommon to find these valves used in parallel push pull. Here each single valve of the push pull pair is replaced with two valves connected in parallel. A 100 W amplifier results.

The KB/V identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the V identifies the maker as Cossor, Highbury, pre Sept 1945.

The centre of the working face is where the additional flange is located. The paper sticker indicates the results of a previous test.

The rectangular cathode tube, two wire grids and a the beam confining plate can be seen above and below the anode.

Side view with the control grid heat sink box on the left.

Here the control grid looks to be gold plated.

The top of the pinch and lower components. The control grid certainly looks gold plated.

The classic envelope is 56 mm in diameter and, excluding the IO base pins, is 123 mm tall.

References: Data-sheet, ¹⁰⁰⁴, ¹⁰⁰⁵ & ¹⁰⁴⁰.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.