Kawai Keyboard Repair

Here Jennie Nell with her Kawai MP6 stage piano. It had a blown -15 Volt regulator on the internal power supply board. Nice keyboard to work on, easy to disassemble. It all powered up and showed a display because the main logic board was powered but there was no audio signal from the output jacks or headphones. It is all fixed now.

Jennie plays keys for Kieran Dobson & The State and solo as Nell

This is the prettiest flight case I have ever had in my shop!

 

Trace Elliot 1215 Bass Combo: Oh Dear, Wonky Knobs

Trace Elliot manufacturing, what were you thinking?! Expensive looking collet knobs on splined potentiometer shafts. They didn’t even put little shims in the slots as I have seen some manufacturers do so the slot closes up. The knobs just go on wonky and come loose so you would be paying for this lazy solution when the warranty claims start rolling in.

By the way folks. Don’t ever try to prise the slot apart, the metal breaks so easily and you end up paying for a new potentiometer. The only technique I found to get them to stay on was to give them a really good tighten with a good driver and hope for the best.

FOR SALE: Laney RB4 Richter 160 Watt Bass Combo Amplifier – £150

This straight-up, no nonsense 160 watt bass combo features a 15″ custom celestion speaker, bass, treble and 7 band graphic mid, switchable compressor and switchable limiter in a solid cabinet with top and side handles.

Recently refurbished

Power RMS 160 Watts
Inputs Normal & High
Equalisation Bass, Treble and 7 Band Graphic Mid
Speaker connections 1x Jack (4 Ohms External)
FX Loop(s)
Drivers 1×15″ Custom Celestion
Compressor
Limiter: Switchable
DI Socket : Pre EQ XLR
Kick Proof Metal Grill
Weight 25.25 Kg
Dimensions (cm) 57.8 x 50.5 x 33.5

The 40 Hz graphic equaliser slider has snapped off short but can still be moved and works OK.

£150

FOR SALE: Kustom Quad 65 DFX 65 Watt Guitar Combo Amplifier – £95

Model: Quad 65 DFX
Power output: 65 Watts RMS
Channels: Rhythm Neutral/Brilliant, Lead UK/USA
Effects: 8 x preset
Impedance: 8 Ω
Internal speaker: Celestion Seventy 80. 80 Watt RMS 8 Ω
Dimensions: 46 x 53 x 29.5 cm
XLR DI output
CD/AUX input summing stereo jack
FX Loop send/Return
Footswitch Jack (footswitch not included)

Amp is very tidy and has just been recovered with leather effect vinyl.

£95.00

 

Fradan Echomatic 50

 

The Fradan Echomatic 50. Tape delay and 50 Watt valve amp in one box. Delivers 50 Watts RMS into 8 Ohms. The two output jacks are paralleled for 2 x 16 Ohm cabinets if desired.

Here is how you wire the footswitch on the Fradan Echomatic 50

Put the switch between pin 1 and pin 3 and an indicator bulb (6.3V AC) between pin 1 and pin 2. There is 6.3V from the valve heater supply between pin 2 and pin 3 so don’t short those pins or you will blow the internal fuse.

 

Gibson Les Paul Deluxe 100 Boost Circuit Schematic

I had to repair a Gibson Les Paul boost circuit and drew out the diagram which does not seem to be available on the net so I thought I’d share. The 47k trimmer sets the boost gain. The 4.7pF caps are an educated guess. I think they are just there to avoid RF interference. It was odd but the source terminal of the J202 FET was connected to the 22k load resistor R3. I guess they are interchangeable.

Gibson Les Paul Boost Circuit

Gibson Les Paul Boost Circuit

Recent Repairs: Trace Elliot Bonneville C50

Trace Elliot Bonneville

James Horrocks is the bass player in the Lol Goodman Band a top class blues band that can be seen at blues venues and festivals around the UK. He called in with a Trace Elliot Boneville C50 1×12 lead combo. It was sounding rubbish, kept cutting out and the reverb was weak and had a hiss. It needed a new pair of EL34 output tubes and some fresh resistors in the reverb circuit. I have never encountered one of these before. It is unusual in that it has two foot switchable channels but volume level is the only parameter you can set independently. The GAIN control and PREAMP STYLE are common to both. Also, it has an FX loop switch on the front panel that cuts off the guitar signal completely when the rear FX LOOP switch is set to SERIES. I thought this was a fault at first but when I looked at the circuit, it was designed this way. The FX OFF switch works as expected when the rear switch is in PARALLEL mode. Despite it’s quirks, it sounds and looks good, especially if you’re into motorbikes. Like the green tolex too.

James said: “Amp sound great Dan …. good job well done :)”

Cheers James!

Lol Goodman Band

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