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CV1978 (commercially the 6SG7) was designed for wideband RF and IF amplification and has a relatively high gm value to ensure a good gain-bandwidth product.

The valve has dual cathode lead-outs to minimise the risk of self-oscillation due to parasitic coupling between input and output circuits caused by common impedance in series with the cathode.

The 6SG7 and 6SH7 are essentially similar except for grid pitch. Type 6SH7 is a 'straight' pentode while type 6SG7 has a variable-pitch grid, giving it a vari-μ characteristic, and would be suitable for the IF strip of radar receivers incorporating 'swept gain'.

The 6SG7 is both printed on the can and stamped into the base.

The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 51 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.