Blackheart Amp Conversion (5 and 15 watt)

I've converted a bunch of these now.  I've added different features to each one.

One amp has a foot-switchable variable boost function added to the back of the amp.

Another received a variable wattage control that lets you change the wattage of the amp from 5 watts down to about a 1/2 watt.

All conversions are done point-to-point.

The top picture is the stock amp with the printed circuit board.  The idea is to remove everything and install the Mojo point to point eyelet board. The kit takes advantage of the extra winding on the stock power transformer to add a tube rectifier.  The kit comes with the tube socket.  A large hole needs to be punched into the chassis and the socket installed. (See the socket installed above the board)

Below picture is the installed board. 

Click on the picture to jump to the Mojo Musical Supply kit site.

Changed our minds... Decided to give the Mercury Magnetics (MM) transformer a trial.  Ordered the kit and the first thing we did was A/B the Output transformer with the stock transformer. The MM transformer sounded more rich and open.  Time to strip the chassis and do it again.

The MM power transformer does not have windings for the tube rectifier. With an A/B test we did notice the sag provided by the tube rectifier.  The solid state rectifier kept the bottom end tight. I used the rectifier tube socket to mount my solid state rectifiers.

The picture at the left shows the chassis with the Power transformer, Choke and Output transformer installed with the leads coming through.

Done.  See the tube socket with the solid state rectifier installed?

Side notes: The MM kit has a few electronic mods to help the tone.  They are all good ideas and were installed.  Look closely at the board and you will notice 3 filter caps were changed.  The original P2P board from Mojo (in my opinion) did not have enough power supply filtering, I added some.

Do you want one? I can do this for you... 

Jump to my Tube Amp Repair page and contact me. Thanks!