UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Akai 4000DS Mk-II

Restoration73 · 30th Oct 2018, 7:53 pm

Unlikely the record head has failed - each side should measure 15 ohms, about 15mH.

It sounds like you have no bias oscillator - can you still erase a previous recording ?
You could detect the bias signal across the erase head with a meter or even a neon bulb.
Failing this, listen to the second harmonic on a long wave radio - it will sound as an
unmodulated carrier.

30th Oct 2018, 7:53 pm	#4
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Akai 4000DS Mk-II Unlikely the record head has failed - each side should measure 15 ohms, about 15mH. It sounds like you have no bias oscillator - can you still erase a previous recording ? You could detect the bias signal across the erase head with a meter or even a neon bulb. Failing this, listen to the second harmonic on a long wave radio - it will sound as an unmodulated carrier.