[jamesperrett]

If you want something that you can use for variable speed tape echo then you'd be better off with something like a Philips N4504, N4506, N4512 or N4515. There are probably others in the Philips range that would work but I know for sure that these would work because they're all based on a similar transport and I've used my N4515 as a variable speed echo unit by connecting a variable resistor in parallel with the preset that controls the 1 7/8ips speed. This gave me a speed range from just over 1 7/8ips up to something like 15ips.