AC044 Mullard balloon 1930 bulbous balloon glass barium coated slanted anode PX4 PP3/250 equivalent matched quartet

Description

The Mullard AC044 aka 4XP also PX4 equivalent PP3/250 is a modern super power valve capable of supplying considerable output.

The efficiency of the valve is good for a triode and the sensitivity, as evidence by the mutual conductance of 7m/V is also high.

The maximum allowable dissipation of the anode is 12 watts .

The valve is of a directly heated type and if automatic bias is used, care must be taken that the resistance across the filament terminals is truly centre tapped, otherwise hum will result.

For large radiogram or amplifiers two of these valves in push-pull give an ouput adequate for almost all purposes.

The most unique and obscure Mullard balloon AC044 ever made in fact we reckon these are the FIRST AC044 introduced by Mullard.

Stunning, breathtaking valves! tall glass close size of a PX25!

Barium coated with slanted plate at 45 degrees, the real HOLY GRAIL of all PX4!

Mullard AC044  tested with AVO VCM 163

Mullard AC044 tested 45mA 100% emission

Mullard AC044 tested 45mA 100% emission

Mullard AC044 tested 44mA 100% emission

Mullard AC044 tested 45mA 100% emission