Gday
Some of the problems people faced with buying modified Sd detectors was that there was quite a few people doing them at the time, 5 or 6 that I know of some were doing the 4 position hot chip mod and some other mods as well, when people on sold them and did not have the instructions on how to use or set up the machine to make use of the mods and it caused some became wary of buying them, also at the time Minelab would not repair the modded machines anyway so they had to be sent elsewhere to have anything done, now minelab don't repair any of the the older sd machines at all as far as I know.
It all depends on what you are interested in doing with it as well, the Sd 2000 is well known for very good depth on large nuggets but not so good on the smaller stuff, so if you were using it for hunting deep ground then as long as you can get it to run fairly quietly you will get deep gold, but if you are chasing flychit then you are wasting your time and thats where the modded detectors came into play, from standard they used 1.92/2.037 Mhz (most common) and also 2.073/2.2 Mhz, the additional higher frequencies that were added were 2.4 and 3.0 Mhz, but even with the higher frequencies you still had the issue of not being able to get the detector to run quiet enough to hear the small targets anyway, later models became more able to handle the ground and run quieter so they found more small gold, but some had dubious depth ability.
If I were to mod an Sd 2000 I would purely be interested in depth mods only as thats its strength, and running a large dd coil, then its really a detector that is built for a purpose and not really a general use detector, adding things like a regulated battery system, audio enhancer/booster and so on will improve its performance for sure and will make it work better than it would have as standard so its a worth while exercise and an economical way to get into the detecting scene.
cheers
stayyerAU
