UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Ferrograph S3 and S4 help with some issues please

jascha · 23rd Nov 2018, 2:38 pm

Thank you all for your kind responses. Much appreciated.
I do have a decent Teac demagnetiser but only demagnetised the playback/record head, not the erase head. I did some swapping over of the oscillator unit between recorders and the problem did not shift. I did improve matters regarding erase on the S4 which was down to a dirty head however I still have to address the recording brightness on the S3. I guess I will need to check the bias trap setting since the machine was recapped and also some resistors replaced. I have 2 Ferrotapes (one of them still sealed) but I think I will adjust for best performance using something like an LGS 52 or LGS 35.
I never biased a Ferrograph properly apart from tweaking the bias pot by ear.
How about the Eq pots? Are they really untouchable?

Cheers guys again

23rd Nov 2018, 2:38 pm	#19
jascha Hexode Join Date: Nov 2005 Location: Kent, UK. Posts: 332	Re: Ferrograph S3 and S4 help with some issues please Thank you all for your kind responses. Much appreciated. I do have a decent Teac demagnetiser but only demagnetised the playback/record head, not the erase head. I did some swapping over of the oscillator unit between recorders and the problem did not shift. I did improve matters regarding erase on the S4 which was down to a dirty head however I still have to address the recording brightness on the S3. I guess I will need to check the bias trap setting since the machine was recapped and also some resistors replaced. I have 2 Ferrotapes (one of them still sealed) but I think I will adjust for best performance using something like an LGS 52 or LGS 35. I never biased a Ferrograph properly apart from tweaking the bias pot by ear. How about the Eq pots? Are they really untouchable? Cheers guys again