Sony Tc-788-4 Manual

Tony Seeff
  1. Minato, Japan
  2. Sony Tc-788-4
  3. Tony Seeff

Vintage Sony Quadradial reel-to-reel recorder with closed-loop dual capstan. Sony TC-788-4: 0 topic. TVK manual; Wanted; Museum.

I have two sony tc-788-4 reel to reel decks and i went and did the full e-recap on one of them. After doing step by step calibration and adjustment i run into the problem of adjusting the record eq. I am not sure what is wrong. The voltages do not change when i do the adjustment. I even try to removed the metal core completely out and there was not change in the v readings. The same thing for both units.

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As the result i get a lot of high freq and low voltage readings on low freq on my recordings. Any idea what could be causing that. Thank you very much. Those coils only adjust very high frequency record EQ ( 25K) and the adjustment range is often very small. Like +/- one dB.

Minato, Japan

So several rotations of the coil just to see any change at all. I'm sure it's working, but you don't notice it. Just put the coil back to the original setting and forget about it. It's not an important adjustment. Worry about important things like: bias level, play EQ, distortion at peak level (+8 VU), head alignment, 10Khz record EQ (which is adjusted by selecting different capacitor values). Tapetech is accurate. The coils are for very minor adjustments at some high end.

Sony Tc-788-4

If you have frequency problems two things can be the problem. One, if you are using an over bias method then that is only an approximate type setting. Then the second is if you are using tape many years made since the deck. I see this all the time in Teac decks made a long time ago that speak of using scotch 203 in the manual.

Tony Seeff

That was terrible tape by today's standard. I have to reduce by changing record EQ caps the amount of boost they applied to the tape due to it lack of ability sometimes 9 dB. In Teac decks that is for the high speed usually changing a 103 mylar cap for the 153 that is typically in the deck. The Sony deck is probably no different in it's boost at the 7.5KHz area. When you reduce the boost then you do not have to over bias to compensate and then as the bias goes down with a newer tape like SM911 or LPR35 the bandwidth begins to become better. Condition of the heads also has to be examined but most of the time loss of high frequency happen first.

Th accepted bias method is to equal 400Hz or 1KHz and 10KHz to start then go up and refine the adjustments. Often times you can get into the 20-23KHz area with Teac decks. Sony decks not so much.

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