Black Box Tube Replacement

Bob Snelgrove · From: san jose, ca

Brad,

I've had my BB a couple of years and wondered what the current tube choice is? I haven't had mine apart but it seems the tone has changed some.

thx
bob

Danny Letz · From: Old Glory,Texas, USA 79540

If I remember what Brad told me correctly, earlier Black Boxes used a different tube than later ones. You may have to pull the cover and either get the tube number or the serial number of your particular Black Box.

Chris Willingham · From: Tulsa, Oklahoma

I'm certainly not speaking for Brad, but I believe he's putting 12ax7's in the newer version. I just replaced mine with a 12ax7 last week. Easy to put in.

Len Amaral · From: Rehoboth,MA 02769

The early versions had a 12AU7 but it's easy to remove the cover and look at the tube.

Danny Letz · From: Old Glory,Texas, USA 79540

Mine was built 6/23/04 and he said it uses a 12AU7. He said it was a very early model.

Steve Lipsey · From: Portland, Oregon, USA

He recommends the Shandong 12AX7's...(not positive about the spelling...)
http://www.tubesandmore.com/products/T-12AX7B-CHINA
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