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Old 13th January 2007, 11:18 AM   #1
Tyimo is offline Tyimo  Hungary
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Default 1:1 output transformer question

Hi!

I would like to try a SS amp with 1:1 output transformer.
Yes, yes I know it is a stupid idea, but I have heard so many oppinions pro and contra about output transformers, that now I would like to test it myself.
I now the sound of the direct coupled and also the capacitor coupled amps. Now here is the time to get acquainted with the transformer coupled amps.
I would like to try it, for example with the good reference amp the JLH69 (if it is possible at all.... ) or with another ca. 15W capacitor coupled SS amp instead of the output caps.
Could somebody help me how can I calculate the parameters of such an 1:1 output transformer?

Greets:

Tyimo
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Old 13th January 2007, 11:50 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
since we here in SS deal in lots of everything, I suggest lots of iron and lots of copper and lots of patience.
That rewinding will drive you to depression or worse.

or

ask the valve heads how to.
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Old 13th January 2007, 12:35 PM   #3
Tyimo is offline Tyimo  Hungary
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Hi Andrew T!

Quote:
I suggest lots of iron and lots of copper and lots of patience.
Good answer....! Thanks

I need a little bit more info!

Tyimo
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Old 13th January 2007, 12:45 PM   #4
sajti is offline sajti  Hungary
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Quote:
Originally posted by Tyimo
Hi Andrew T!



Good answer....! Thanks

I need a little bit more info!

Tyimo

The design should be same as the tube output transformers. You know the input, and output voltages, and the impedances. The structure must be same as well

sajti
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Old 13th January 2007, 01:02 PM   #5
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The first SS amps used germanium transistors and output transformers....
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Old 13th January 2007, 02:11 PM   #6
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I have had good success with using toroidal mains transformers in low output impedence tube circuits.
Consider experimenting with toroidal isolation transformers. Otherwise you will have to build your own EI types (not fun).

Shoog
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Old 13th January 2007, 05:42 PM   #7
Tyimo is offline Tyimo  Hungary
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Quote:
You know the input, and output voltages, and the impedances. The structure must be same as well
Thanks Sajti!
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Old 13th January 2007, 05:43 PM   #8
Tyimo is offline Tyimo  Hungary
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Quote:
Consider experimenting with toroidal isolation transformers.
Thanks Shoog! I thought on the same....

Tyimo
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Old 14th January 2007, 06:01 AM   #9
Tyimo is offline Tyimo  Hungary
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Hi Sajti!

Quote:
The design should be same as the tube output transformers. You know the input, and output voltages, and the impedances. The structure must be same as well
Could you be a bit more detailed?

One of my amps has:
- +/- 12Vrms output
- 2A bias
- 8R speaker

I don't know the output impedance of my amp.
I use 4.700uF output caps and I would like to try the 1:1 output transformer in stead the caps.

Tyimo
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Old 14th January 2007, 06:50 AM   #10
sajti is offline sajti  Hungary
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Quote:
Originally posted by Tyimo
Hi Sajti!



Could you be a bit more detailed?

One of my amps has:
- +/- 12Vrms output
- 2A bias
- 8R speaker

I don't know the output impedance of my amp.
I use 4.700uF output caps and I would like to try the 1:1 output transformer in stead the caps.

Tyimo
If You have symmetrical PSU, You don't need output capacitor. There is no chance for the output transformer, if You have DC offset on the output of the amplifier.

So first You have to get the size of the iron, which is depended by the power. If You have it, You can count the number of the turns, which is depended by the voltage. In practice the primary, and the secondary turns can be same

sajti
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