[Antipodal]

Thanks for your interest Arran. I think you are right that this set is a " cheapie "with no R.F. stage.You raise an interesting point about the use of the 41 rather than the 42 , attributing the use of the 41 to the gain made by reducing filament consumption by 300 mA. You are right in that this must probably have been a consideration to be taken into account by the engineers designing this set. The less current drawn from the battery the better.Yet they seemed quite content to continue to use an electro dynamic speaker drawing at least an amp to energise. My reading of Radiocraft of that era suggests that permanent magnet speakers were available in the U.S. (No Koil Speakers ) but perhaps they were too costly. Have I got this right? Is there an accepted view on why U.S. car radio manufacturers continued to use E.M. speakers for so long? Its a question which has intrigued us here in N.Z. for some time. Cheers everyone.