Interested in a couple of Croft pre amps, one is older micro A, not sure about the specs on that one, no info on web, its the one where the top casing has many punched holes in it, rather than the newer ones with a few elongated slots for ventilation. And also the more recent model - the micro 25. Anyone know the cost of a standard service at Croft for these? The newer one may not need it, just wondering how long valve pre amps are good for without a service. Oddly to me anyway, the older model has discrete left/right switching, meaning when you change from cd to phono or streamer, you need to change 2 switches rather than one, not exactly the height of luxury! And of course the newer models have left and right volume controls!