from
http://www.gwest56.freeserve.co.uk/ferrograph/
I think the three doctor who tape decks were :
Vortexion WVA2 ( used to play the tape )
Behind the Doctor and Rose while the tape was switch on , on the other desk were two more decks
Wearite/ Ferrograph Series 5 ( black case )
Clarke and Smith something ( timber case )
( this is from memory as I did not video the episode )
I immediately noticed that this was wrong for 1941 ( as i guess in episode 1 was Big Ben Tower illuminated !! ) , thanks to searching the internet from earlier ( I have a WVA 2 and was searching for its value a few months back ).
The powers the Child had got from the alien medical repair nanoagents included the ability to utilise any loudspeaker device for communication , hence the voice continiung after the tape had run out ( but dont the wearite decks have a cut off arm that stops the tape when the end of it has passed through ? )