Tube Amp Archive

I would probably start with a shop vac, and some low pressure compressed air. Blow as much crap out of it as possible then see where you are.

Here is where I am at now. I have added: 1. Ground Switch to isolate the grounds after the standby switch in case there is a ground loop issue. (shown in green) 2. Added a DI out 3. Added a variable notch filter with a DPDT on/off 4. A couple other minor tweeks [IMG:1023:581]http://i268.photobucket....

Here is an updated schematic: I have added a cathode follower to boost my output in case there are long runs to house sound, also I have changed to a SS rectifier since there really is no reason for a tube rectifier in this. I still need to figure out the notch filter and I may add a trans and XLR o...

not my exact bass, but I have played others with piezos thru a b15 and they sound great!

Here is a schematic I did to start with. I still need to make sure the input impedance is correct for a piezo. And I need to figure out where to put the notch filter(s) and exactly how to do them. [IMG:1023:608]http://i268.photobucket.com/albums/jj26/thebattens/Upright%20Preamp/PiezoPreamp.jpg[/img]

I am on vacation for a week and I am starting to plan my next build.  I play an upright bass that has a dual piezo pickup.  It came with a preamp that sounded so bad I literally threw it away.  What I want to build is an Ampeg b15n based dual channel preamp that I can use to plug into house sound, m...