Ampeg BA115 Bass Amp Falling Apart (Literally)

Back in August of 2017, one of these combo bass amps came through the Unbrokenstring Shop with cracked solder joints, which were probably a result of brittle lead-free (RoHS) solder on the circuit board.  The owner of this Ampeg saw that post and called up the Unbrokenstring Crew to ask if this amp could be…

Ampeg B2-RE Bass Amp Gets New EQ Potentiometers

Bass players use SERIOUS hardware, and this Ampeg B2-RE is a serious, heavy, high-end bass amp.  So why in the world does Ampeg use those tiny little plastic slide pots for the equalizer controls?  The Unbrokenstring Crew digs in. Ampeg is a name that needs no introduction nor elaboration.   Three of the plastic handles…

Peavey MKIII Bass Head Needs Un-Smoked

This solid state Peavey Bass head is also capable of handling mixer, equalization, and preamp roles for public address, monitor, and other sound reinforcement roles.  But power amp quit!  Can the Unbrokenstring Crew help? The AutoMix function that Peavey developed has been discussed elsewhere in the blog.  Lots of EQ knobs here!   Note the…

Mesa Boogie Bass 400 Repair and Refurbishment

Craig was very proud of his rack-mount tube-powered bass amp.  But there were crackles and pops while playing.  He wanted to have everything looked-at.  Could The Unbrokenstring Crew get it tuned up? This is a heavy monster.  Yes, that implies 400 watts out.   These are the tubes that were still alive.  We’re missing a…

Peavey KB4 Keyboard Amp Disintegrating

This Peavey keyboard amp works intermittently, but the modular AC outlet has completely come loose from the rear panel. Can the Unbrokenstring Crew fix this? This unit is pretty cool, with a built-in luggage roller and extendable handle as standard equipment from the factory.   The modular AC plug was covered in RTV rubber.  Was…

Intermittent Ashdown EVO III 500 Bass Head

This head was soldiering away in the studio when the output signal became distorted.  Can the Unbrokenstring Crew un-distort the output and keep it from happening again? Stock photo credit: Ashdown Engineering   Name, rank and serial number, please.   The oscilloscope shows the waveform presented across an eight ohm resistive load.  A sinewave is…

Peavey Mark III Bass Head – Busted Controls

These sturdy old bass heads turn up in pawn shops and Craigslist from time to time. They soldier on for years, sometimes making music for decades. This unit came in for some minor repairs and a Million Mile Checkup. Let’s get to work! This unit has LEDs for the power indicator and a clipping indicator,…