Preamp Deal of the Century

Hello,

Are any of you using Synergistic IC's with active shielding?

I get a hum if I use them on the output section going to the
amps (Nagra VPA, 50 watt, Class A). If I disconnect the shield, the buzz is diminished yet not completely removed.

Thanks for your thoughts,

Cr

Cr - I have DIY active ( 12vdc) shielded single ended IC from dac to cortese and there has been no hum at all - I am doing similar to amp ( solid state) - a rough prototype did not hum - it all gets very complex with lots of different currents at the rear of the rack though -
I did try them on a a passive pre to OTL graff amp of a friend and there was quite a hum

Cheers

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.