Preamp Deal of the Century

Rectifier tube question. I know i could probably find answers to this question if I spent an hour looking through these threads, but thought I'd just save time and ask outright. What is the best rectifier tube I can try for my Supratek Syrah? I've been using Mullard GZ37, comparable to this one:
http://www.kraudioproducts.com/Mullard-Brimar/ProductDetail.aspx?CatID=65&ProductID=150
and have gotten fantastic results from it, but it went dead last week. I've since been using a Bendix, but it's nearly as good as the Mullard. Should I just get another one of these GZ37? Might this more pricey GZ37 do the trick:
http://www.kraudioproducts.com/Mullard-Brimar/ProductDetail.aspx?CatID=65&ProductID=155

or do I need to refocus elsewhere. thanks in advance! Still looving my Syrah after about 7 years now!!! It's the only piece of my equipment that hasn't changed!

(I meant to say that the Bendix is not nearly as good as the Mullard, IMHO of course..)

Outlier, if you look a couple posts above yours, you'll see my review of the Mullard GZ33. It's approved by Mick, and I think it sounds fantastic.

Thanks Ait (Have you tried the GZ37 though - just curious about the comparison).

No, just GZ33 and GZ34/5AR4. I prefer the GZ33.

If you look at the ratings, the GZ37 should not be used with a first PS cap greater than ~4uF due to too great of a current draw on the tube; the first PS cap in my Chenin is 3uF. Yours is probably close to that. Maybe that's why the GZ37 died?

The GZ33 can handle a lot more (up to ~60uF, I think I read somewhere).