UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

theredhouseinn · 11th Jan 2019, 6:34 pm

Can anyone help me with a circuit diagram for a Tubon hand held keyboard type number IE50.
I have recapped it and checked all tr's and resistors.
It is making a noise and the keyboard works in changing the frequency of the sound.
It is not a sinewave o/p so any info on waveforms would be useful.
I have drawn out the cct of the pcb but it is strange territory for a vintage amp fixer like me.
John.

11th Jan 2019, 6:34 pm	#1
theredhouseinn Hexode Join Date: Jan 2013 Location: Kelvedon, Essex, UK. Posts: 273	Tubon hand held keyboard Can anyone help me with a circuit diagram for a Tubon hand held keyboard type number IE50. I have recapped it and checked all tr's and resistors. It is making a noise and the keyboard works in changing the frequency of the sound. It is not a sinewave o/p so any info on waveforms would be useful. I have drawn out the cct of the pcb but it is strange territory for a vintage amp fixer like me. John.