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My Mods to Sony TCK-670 3 head cassette Deck

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Hello to all:

I have a three head, three motor, closed loop dual capstan
Sony deck (TCK-670) that I did the following mods on:

1. Replaced all electrolytic bypassing & coupling caps with
Panasonic HF units (also with poly bypasses)

2. Improved all power supply capacitors with bigger & better
units (with poly bypasses) and added super fast soft
recovery diodes.

3. Built a custom output stage after Dolby chip using BB 2134
op-amp with low output impedance.

4. Improved input level volume control.

5. Added chassis damping and AC filtering.

After the mods, and using something like TDK SA-X cassette tape
(and Last head treatment), the record/play sound quality is very nearly identical to CDs used to make the cassettes. HQ parts do
quite a bit for even units that already sound very good, and I
have to say I was surprised at just how good cassette playback
could be for a non-Nak deck! Good enough for all but very critical
listening.


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  • My Mods to Sony TCK-670 3 head cassette Deck - Dan 17:08:07 07/23/04 (0)


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