Page 26 Advertisement 1

Radio Record, Volume III, Issue 11, 27 September 1929, Page 26

V3 The zew Mullard Peatone ie a powet Oubpu: valve that does the work of two ordinery LR: 8tage8. Et enables You to increage epormously the volume ftom your receiver without a0y alteration t0 the exieting wiring: Moreover; by dispensing with one stage Of LR amplifcation the PERFECTED use of the Mullard PM: Pentone Fegults in a remarkable increage in puzity- PENTONE The Pentone diffecc from the ugual supec-power valve in that it has {wo additional grids, one of whick i8 connected VALVES BY internallv to the filament while the other makes Con- nectton with 0 terminal On the side pf the valve babe It has a normal fous-pin bage and plugs into any MULLARD erandard valve holder: The only eddition is 3 fexible lead from the terminal On the valve bage 80 the HT+ In consequence the Mullard Pentone i8 cepable ot delivecing 3 huge Outpue of pure undistorted volume and THE VALVE has 2n enormous amplification factor_~ in che cabe of the Mullard 4 volt Pentone PM.24 the amplification factor io 62. The mutual conductance of the Mullard PM: 24 WitH THE is 2.3 mAN a8 compared with 1 mAIV Or le8s for 3 guper-power valve of the 3 electrode eype: TWO-VALVE PHNGH Mullard THE MASTER VALVE The New Mullard Procuruble smb 82 44 A.c. Valves will fit and 6 Volt Ux: ana any American Elec Fnglish tric Set and im- Base. 82/6. prove results. lewvest 6 2 3 ddrr Ib Mullard Wirekss Scrvice Cr Uds, Mulard Hoxss;, Denmztk Street, Londons, W C.2 #u. ubtainable in 2, 4, and 6-Volt: UX and Engligh Bage, from aIL good Radio pealers. Now Zealeud Selling Agents : SPEDDING IIMITED : Box 482. Auckland ; Box 1582. W allington ; Box 922, Christchurch ; Box 516, Dunedin. eFpiciencx 'Mighbst Go-suMDtioN