Hi all, I just got a used Demeter VTBP-201. Just curious if any of you have tried different tubes. This one has Ei tubes. I have heard of people using Groove Tube, Telefunken, Electro Harmonix and so on. Tell me what you are using. Also, just curious of your eq choices, 120 or 60, 2 or 4 on prescence. I love this unit. I also have the HBP-1, but it doesnt have the warmth that the older model seems to have. Thanks for your input.