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Old 11-03-2019, 04:22 PM   #1
Lef de art
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Default Different capacitors in the sassi and different values in the schematic !

Hello guys.
Recently i finished my first restoration in a 61 years old tube reel to reel recorder (Geloso G258) .
Thanks God the process ended positively and the recorder works again very good.

In this process i met a big problem by trying to figure what value in capacitors to use.

I say this because all the capacitors excluded the electrolitic had different values from the capacitors in the sassi !!!
Not one or two capacitors. It's about 12 capacitors !!!
For sure i have the correct schematic.

At the end i have used the values from the sassi and everything works perfectly.
Any idea why this happens?
I believed that the schematic always corresponding with the real machine.

I really need to hear your opinions .

The first picture show the values of the sassi capacitors.
The second the schematic.
Attached Images
File Type: jpg IMG_20191103_220129.jpg (550.2 KB, 13 views)
File Type: png IMG_20191103_155755.png (828.1 KB, 15 views)
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Old 11-03-2019, 06:34 PM   #2
redwire
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Default Re: Different capacitors in the sassi and different values in the schematic !

Some capacitors can be higher or lower value, or voltage, they are not critical. If you need minimum 20K (0.02uF) but you have 25K (0.025uF) parts in stock, then you use them. Sometimes improvements are made during production, so the parts are different because the schematic did not get updated.
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Old 11-03-2019, 07:27 PM   #3
Lef de art
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Default Re: Different capacitors in the sassi and different values in the schematic !

Thanks again Redwire
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Old 11-04-2019, 05:22 AM   #4
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Default Re: Different capacitors in the sassi and different values in the schematic !

hello
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Old 11-04-2019, 05:32 AM   #5
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Cool Re: Different capacitors in the sassi and different values in the schematic !

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Old 11-04-2019, 12:25 PM   #6
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Default Re: Different capacitors in the sassi and different values in the schematic !

A capacitor with 250/5 inscription, what value it has ?
I know the 5 is the tolerance but the 250 what it is ?
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Old 11-04-2019, 12:35 PM   #7
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Default Re: Different capacitors in the sassi and different values in the schematic !

Or this capacitor . Is 500v , 5% tolerance
The 200 in what unit is ?
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Old 11-04-2019, 02:40 PM   #8
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Default Re: Different capacitors in the sassi and different values in the schematic !

Quote:
Originally Posted by Lef de art View Post
Or this capacitor . Is 500v , 5% tolerance
The 200 in what unit is ?
Looks like a polystyrene capacitor, possibly 200pF.
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Old 11-04-2019, 03:38 PM   #9
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Default Re: Different capacitors in the sassi and different values in the schematic !

Yes it's polystyrene capacitor. So it is pf
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Old 11-04-2019, 06:34 PM   #10
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Default Re: Different capacitors in the sassi and different values in the schematic !

They could be 200pf 500V Ducati Axial Electrolytic Capacitors
Here is a picture of 1300pf 600V Ducati Axial Electrolytic Capacitors
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Old 11-06-2019, 03:04 PM   #11
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Default Re: Different capacitors in the sassi and different values in the schematic !

Comparing the recording sound i have now with the sound i had before changing the capacitors i have the filing that i have lost enough bass, low frequencys.
As it is normal in the replacement capacitors process it wasn't easy to find the exactly value in capacitors. So some changes was made...
There is any chance the following replacements to be wrong?
What is your opinion?

0,005uf / 150v replaced with 0.0056 250v

0,002uf / 400v replaced with 0,0033 400v

0,025uf / 300v replaced with 0,027/ 400v

0,5uf / 150v replaced with 0,56/ 250v


Or this differences are not important?
Thanks in advance guys
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