19-02-2020, 06:00 PM
Thanks
1) It's particularly the Roberts World Band set built in cassette deck, so a separate cassette recorder doesn't apply. I'd not bother with any of my other recorders as I have maybe 3 decent decks. Possibly a 4th really good one if I repair the Aiwa, though it might not really be better, just more tape types and fancier.
2) I have never seen a cheap recorder with AC erase, only table top HiFi models. Even some Micro and Mini alleged "HiFi" all-in-one models don't have AC erase, though have AC bias.
3) I'd not generally bother as such cassette decks are usually poor in other areas.
Researching it, it seems that there was only a brief period when portables used AC erase, then they cost reduced to a magnet. Heads with DC erase seem rare. The "new" USB enabled cassette players appear to be atrocious compared to any built in sound card and a late 1980s pocket model, never mind a HiFi deck connected to a decent sound card or external box.
I have at least one old cassette head. I suppose if the gap is too small I can use a higher frequency. Between 55 kHz and 100 KHz, seems to be used. All the schematics seem to just use the bias oscillator. I can put a scope on an erase head and see what level it is.
I have acetone. It's only on the metal parts that's stubborn. The plastic pulley wheels are sort of non-stick anyway.
1) It's particularly the Roberts World Band set built in cassette deck, so a separate cassette recorder doesn't apply. I'd not bother with any of my other recorders as I have maybe 3 decent decks. Possibly a 4th really good one if I repair the Aiwa, though it might not really be better, just more tape types and fancier.
2) I have never seen a cheap recorder with AC erase, only table top HiFi models. Even some Micro and Mini alleged "HiFi" all-in-one models don't have AC erase, though have AC bias.
3) I'd not generally bother as such cassette decks are usually poor in other areas.
Researching it, it seems that there was only a brief period when portables used AC erase, then they cost reduced to a magnet. Heads with DC erase seem rare. The "new" USB enabled cassette players appear to be atrocious compared to any built in sound card and a late 1980s pocket model, never mind a HiFi deck connected to a decent sound card or external box.
I have at least one old cassette head. I suppose if the gap is too small I can use a higher frequency. Between 55 kHz and 100 KHz, seems to be used. All the schematics seem to just use the bias oscillator. I can put a scope on an erase head and see what level it is.
I have acetone. It's only on the metal parts that's stubborn. The plastic pulley wheels are sort of non-stick anyway.
