03-04-2024, 08:53 PM
(This post was last modified: 03-04-2024, 08:58 PM by Mike Watterson.)
I don't think Philips & Bush shared designs.
They are only similar in being Bakelite and Ux4x series which many models shared in that era. The Philips is a "Short Superhet". Those were at the more budget end as were AC/DC (transformerless for HT, some series live chassis had an auto-transformer for heaters) and Bakelite.
Both those line-ups of valves were widely used in UK and rest of Europe and probably all the European makers made those valves.
The Mullard version is MUS271. Trader sheet 948. Mullard being a Philips subsidiary from 1928.
The Bush DAC90A and more deluxe DAC10 use capacitive tuning. This Philips uses permeability tuning, which was last used commonly in some transistor car radios.
Interesting set. Apart from the permeability tuning the AGC was odd and can't have been very effective as it's only on V2 suppressor grid. However some 1950s battery valve models had no AGC.
They are only similar in being Bakelite and Ux4x series which many models shared in that era. The Philips is a "Short Superhet". Those were at the more budget end as were AC/DC (transformerless for HT, some series live chassis had an auto-transformer for heaters) and Bakelite.
Both those line-ups of valves were widely used in UK and rest of Europe and probably all the European makers made those valves.
The Mullard version is MUS271. Trader sheet 948. Mullard being a Philips subsidiary from 1928.
The Bush DAC90A and more deluxe DAC10 use capacitive tuning. This Philips uses permeability tuning, which was last used commonly in some transistor car radios.
Interesting set. Apart from the permeability tuning the AGC was odd and can't have been very effective as it's only on V2 suppressor grid. However some 1950s battery valve models had no AGC.
