Best option for the price!
Have used several different pre-amp tubes, JJ, Tung-Sol, Mullard, Sovtek and in this price range I tend to always fall back on the EHX 12AX7. Never had an issue with noise or microphonics. I've dropped them and still never had a problem. They last and sound great, nice harmonics and crunch without being fizzy or dull. I haven't noticed a difference I can pin-point between the regular and gold pin tubes, but I suppose the gold pins are good if the rest of your amps connections are gold plated.