Your best bet is to put the better tubes in the back as they affect 85% of the sound by accounts that I've heard. I have 4 NOS Russian mil-spec tubes in the front four and a pair of early 70's Siemens E88CC's in the rear. Granted my CDP (Musical Fidelity A3CD) doesn't have a great deal of slam to begin with it is my opinion that if you are looking for slam that you should look beyond these tubes as well. Having said that, these tubes do sound much better than the stock ones. Good luck.
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