Michelson & Austin TVA-1 how to Change Output transformer from 8 to 4ohm

[tikiroo]

Or just follow the wires

 

[euro21]

sorry euro21 but which beeber function you mean ?

 

[waltube]

Hello together,
I want to change from 8ohm to 4 ohm has anybody an Idea how the wiring shoud be done for an 4ohm application ?

Cheers
salwa

this is another digram of TVa 1

 

[salwa]

ok thanks!

That matches only when wires have same thicknes ?

 

[salwa]

excuse me waltube have youn an link ? the picture is not good to see.....

 

[waltube]

sorry at moment I cant make these check at my own , the amp is at maintenence and I try to check out how the situation is with the Outputtransormer...

But I will contact my technican that he makes some pictures and these mesurement you suggested......

The photo on post 16 there is, on the right side, the section to output.
On tap 8 ohm there is a grey cable and orange cable, this one goes to + of loudspeaker connection?
Then follow the cable from - of loudspeaker connection to the trafo, it is 0
But if you look on the top of connrction you can see a big cable, maybe it is 0, check the way to binding post.
So the connections are in reverse mode.

 

[waltube]

excuse me waltube have youn an link ? the picture is not good to see.....

look here
https://www.vintage-radio.net/forum/showthread.php?t=52103

 

[salwa]

Ok I have spoken with my technican, he will make these beeper check he nows what you mean euro21......

 

[salwa]

so you all right my is reverse here the correction of picture in #16:

 

[salwa]

I think the direction is now clear!

In the orginal manual is nothing mentioned about 4ohm application ?

 

[waltube]

In the orginal manual is nothing mentioned about 4ohm application ?

My opinion is that if you move the cable from + binding post to the tap 4 ohm you can solve the problem

Walter

 

[salwa]

okay..........it is realy strange that nothing is available in manual........

 

[tikiroo]

My opinion is that if you move the cable from + binding post to the tap 4 ohm you can solve the problem

Walter

I'm not so sure. The second winding will not be used at all if you do that. The "4-8" section and the "0-16" winding must have the same number of turns as they are currently connected in parallel. So I think they are both "4 ohm" windings.