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Uncle Bulgaria · 14th Mar 2019, 2:00 pm

Yes Bill - I've got the top plate on and everything hooked up besides the heads. They're a little difficult to access so I didn't want to be dealing with that until I was sure the basic functions are working.

The motors all spin on their allotted settings (FF, RW, Play, Rec) and the speed change works. The 'run' slider is just not holding in. I notice it is shorted by the 'stop' button and the 'auto-stop' switch. The 'auto-stop' is out of circuit, so open. I believe this means it is not preventing the solenoid from energising. I can't see how mine works anyway as it's very different from the illustration in the book and doesn't seem to have any means of switching.

On 'Rec' the panel meter can be adjusted to zero. There is no output to the speaker, so I'm checking the valve voltages in the amplifier section and have already come across two further very high resistors.

The solenoid coil has a resistance of 355 Ohms.

14th Mar 2019, 2:00 pm	#54
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,333	Re: Ferrograph 4A: Restoration advice needed Yes Bill - I've got the top plate on and everything hooked up besides the heads. They're a little difficult to access so I didn't want to be dealing with that until I was sure the basic functions are working. The motors all spin on their allotted settings (FF, RW, Play, Rec) and the speed change works. The 'run' slider is just not holding in. I notice it is shorted by the 'stop' button and the 'auto-stop' switch. The 'auto-stop' is out of circuit, so open. I believe this means it is not preventing the solenoid from energising. I can't see how mine works anyway as it's very different from the illustration in the book and doesn't seem to have any means of switching. On 'Rec' the panel meter can be adjusted to zero. There is no output to the speaker, so I'm checking the valve voltages in the amplifier section and have already come across two further very high resistors. The solenoid coil has a resistance of 355 Ohms.