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Yes, that's it : Calculate a value e.g. -10dB in mV.

I found this kind of formula : V = V0dB x 10(LdB / 20)
With V0dB equals voltage at 0dB = 1,3V for 514nWb @0dB.

For example with LdB = -6dB :
V = 1,3 x 10(-6/20) = 651mV

With LdB = -10dB :
V = 1,3 x 10(-10/20) = 411mV

With LdB = -20dB :
V = 1,3 ...

I hope that this post will be useful for other TS1000 loyers !

Last question : do you know how to convert VU dB to RMS voltage using 514nWb @dB = 1,3V ?
I searched on the net but couldn't find any clear rule !

Have a nice week-end

François

Hi Mampfi !

Job done !
Many many thanks for your support.

The tuning you described works perfectly.
You can check my screenshots attached.
Calibration and heads alignment are now OK at 1khz and 10khz.
Let's enjoy !

With kind regards.

Francois

Hi mampfi,

I'm back with some news !
I checked the tape path and it seems to be ok, just by watching the tape contact with the heads with a transparent header tape.
I then tried to tune the screws for playback head alignment, using my level calibration tape.
I succeeded in getting a better result ...

Ok, if you playback the testtape, you have to adjust the internal level to 675mV (with this 250nWb tape) @9,5cm/sec
The internal level you can measure at the adpapter board

Adapterplatte TS 1000.jpg

or on the input plug for the phones amplifier

Kopfhörerverstärker TS1000.jpg

Or the output from ...

Hi Mampfi,

Still waiting for my level test tape.
In the meantime, could you explain the role of R1/R3/R5 and R2/R4/R6 trimmers on board Y for recording ?
Thanks in advance.
Regards.
François

Very clear !
I'll use the adaptater board.
Nothing to do with other trimmers (R88 + R99 on board D and R13 + R14 on board G) ?
What are their role ?
Thanks

Hi Mampfi,

I bought the tape.
I should receive it next week.

So if my understanding is correct, reading this tape at 9.5cm/s should provide a -3dB level on the VU meters, as it provides a 250nWb signal, right ?
To adjust, I have to tune R53 and R54 trimmers on board G but also R61 and R62 on ...

Hi !

Got it !
The tape is still available but it seems to be IEC2.
Is it compliant with the TS1000 ?
I thought IEC1 was mainly used in Europe.

Kind regards

François

Hi Mampfi,

Thanks for your answer.
Anyway, the TS1000 I get was already no more calibrated and I had to replace some trimmers during its restoration.
So, I'm starting from scratch !
Unfortunately, I have no pre-recorded calibration tape, and the cost of a new one is a bit dissuasive...
How can I ...