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I’m in the midlands at moment. Just had a pleasant drive around a housing estate looking at peoples lights.

Interesting account of how he actually wrote that song on the bbc a few days ago.

Can't see it being related to motor speed. That would normally result in either slow/fast playback or more likely a wow-ing type variation in the audio output as the motor speed hunts up and down.

My first guess would have been it's related to tape pickup head alignment. It doesn't take much misalignment on the tape/head to cause a muffled type sound. However, if I understand correctly you're saying you've picked off the signal prior to the main amplifier and played it through a different amp, and it sounds ok? If that's correct, then probably not alignment.

Have you got a signal generator and an oscilloscope? If so you can usually inject a signal somewhere close to the tape pickup heads and then follow it through the circuit using the scope to see where the distortion is introduced. I'd go with a 1KHz signal at low amplitude (perhaps a few mV) to start with and crank up the amplitude once you're happy. Distortion on pure sine waves is usually pretty easy to spot by eye (on a 'scope), and even easier to hear.

There are some fairly complex frequency compensation circuits on cassettes due to the different charicteristics of various metals used in the tapes, plus other compression stuff (Dolby B/C for example). Don't rule out faults in these compensaiton circuits.

Haven't got time to look deeper today - need to go to Street/Clarks Outlet centre tonight. Shops close at 7pm and parking is only free after 6pm so a narrow window to get in and out without paying.  Not looking forward to it. 

He won't be driving home for Christmas. Plagued with ill health over his lifetime i believe. RIP Chris, really liked his music.

Just for STEMO

Well done. Thanks. 

Chris Rea. 74. 

.....
  You’d also lose the track/volume controls from the Omega B steering wheel wouldn’t you?
Others on here with personal experience of the Omega A will be better placed to answer this.

iirc the preface lift cars didn't have controls on the steering wheel, but I think you're right re the airbag

Just for STEMO

Thank you. How festive 

OFFS....again.

Just for STEMO

Thank you. How festive 

Just for STEMO

OFFS.