JVC RC-M60 boombox radio recorder

Hello. I'm restoring a vintage JVC RC M60 boombox that I bought at a garage sale.
I have replaced the sliding bass and treble potentiometers and the two volume potentiometers R and L.
I have disassembled and painted the cabinet with original color and replaced the cassette mechanism belt.
The problem I have is that the recording/playback head is not the original SA from JVC. It's a generic one.
Then I see that the sound reproduced from the cassette is low and blurry, with almost no treble.
I think the culprit is that head. It has 260 ohms.
Does anyone know what impedance or resistance the original JVC SA (Sen Aloy) head has?
Any replacement?
Thank you.
 

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