Originally Posted by nikongod
OTL amps are by and large over-rated.
The Zana Deux doesn't like you!
Might I suggest an Eddie Current Zana Deux instead? And there's also the Zana Deux Transformer if you don't want OTL.
Hey, if you can afford a Raptor, you can save up a bit more for a ZD!
I used to own a Raptor but sold it after getting a Zana Deux. I think the ZD is significantly better. I did try many tubes in the Raptor, including the well-known Tung-Sol 5687, various Mullard, Amperex, etc. and some 12BH7 and even a Telefunken ECC802S.
The tube cost for a Raptor can be a lot higher than for the ZD. The ZD uses 5 tubes to the Raptor's 3, but the single 6SL7 is the only one that's really important, and most 6SL7 is relatively inexpensive. Relatively, that is, compared to 6SN7, 12AX7 or 12AU7 market prices.
With the Raptor, you can find yourself spending a lot of money for all three tubes. The selection for 5687 is generally mostly limited to US production, and you can't go wrong going with Tung-Sol.
With the 12AU7 spot, there's a wide variety to choose from and it can get costly. You'll find yourself being stuck with many extras, since many of these are sold as matched pairs (the seller can often get more money by selling as a matched pair than singles). Admittedly, this also happens with the ZD's single 6SL7, where I'm often breaking up matched pairs. Doing this once with a matched quad of Valvo 6SL7 almost killed me, I had to do penance by listening to the ZD for four hours straight.
Forget the Woo (I've never heard one) or the Raptor, go for a real tube amp like the ZD! Your wallet will hate you, but your ears will be happy!