Blown line fuse and hum.....

[TNO]

Hello everyone,

New to the forum but not new to loving to play my Wurlitzer!  I have a Wurlitzer 206 and I love it.  It's a mainstay in my home studio.  But I've run into a problem....... The other day I decided to install the aux out mod on her.  I do my own electric work on my guitars and most of the work on my effects pedals as well.  I got the kit from VV and installed it properly according to all the directions.  When I turned my piano back on I got a loud hum and then she blew the line fuse.  I've since removed the parts I added and installed a new fuse.  Same result, loud hum and line fuse blows again.  Now I am at a loss for what might be wrong.  Could it be the caps?  Maybe the transistors?  Is the transformer now bad?  And also if I did indeed install the mod correctly why might this have happened in the first place?  Any help would be greatly appreciated!

Additionally, the only component that got hot and had smoke was the line fuse.  The transformer never got hot or smelled bad nor did any other components.

Thanks again for any help.

[pianotuner steveo]

I am not familiar with the exact kit, but did you possibly solder an electrolytic cap in backwards?

[cinnanon]

The aux out mod should only consist of 2 resistors and a 1/4" phone jack with a shielded lead. Is that what it was?

[TNO]

Yes, the two resistors and the 1/4 " jack.  No electrolytic caps.  That's why I am at a lost as to what could have possibly happened.

[TNO]

I am not familiar with the exact kit, but did you possibly solder an electrolytic cap in backwards?

No caps, only resistors involved in the mod.

[TNO]

The aux out mod should only consist of 2 resistors and a 1/4" phone jack with a shielded lead. Is that what it was?

Yes, the two resistors and the 1/4 " jack.  No electrolytic caps.  That's why I am at a lost as to what could have possibly happened.

[pianotuner steveo]

Did you short the + and - of the output?

You may have bad output transistors now.

[TNO]

Did you short the + and - of the output?

You may have bad output transistors now.

Your guess is also my best guess as well.  I figured I would replace tr8, tr9, and tr10 and see if that resolves the issue. 

[pianotuner steveo]

Well, you should test them to see if they are shorted first..

[Tim W]

Why not save yourself hours of frustration, the ordering and cost of non-returnable parts (+s/h every time you need something else), and poor, noisy performance even after the repair is done?

Just put in a new Warneck Research EP200 and have worry free ultra low noise performance for the long haul. Reed bar pickup shield plates are included with the EP200 package for even better overall performance.

Heck, I'll even send you a new fuse!   

Tim
Retrolinear.com

[cinnanon]

I second that! Easy install and perfect recordable tone!