AU-X1

[Ronito6]

I believe the toroidal from g9000 won't do , the voltages might be different.

Time to find out.

Both Toroidals are from the same manufacturing epoch 1979-1983.

Chances are quite good that they are the same.

We shall see.

 

[Hyperion]

That's a huge shame about the transformer - - in the absence of a multi-voltage replacement - perhaps another 100V (JDM) one?

 

[Willy6]

That's a huge shame about the transformer - - in the absence of a multi-voltage replacement - perhaps another 100V (JDM) one?

I might be testing it wrong.when it's all wired in to board 2781 it shows short on the dbt and when I unplug the power wire from the toroidal transformer to board 2781 the relay clicks and all the lights come on so I pulled the transformer out and applied power in and measured voltages out.on the schematic the yellow wires are 14v and I'm getting 18v and on the green and purple wires 48v and I'm getting 50v

 

[Hyperion]

Firstly 'well done' on using the DBT however I am a little puzzled by what you say, I have a few questions.

Is the amp fully assembled? - if not what is the assembly status?
The toroidal transformer should have secondary windings with a pair of greens and a pair of purples - but you say yellow ???
When you say lights come on and relays click - is it just the soft start? or speaker relay as well?
What lights come on ?
Are the output transistors connected? (driver assemblies installed ?)

 

[Willy6]

I'll post some pics of how I am bench testing the transformer in case I'm missing something.I had the amp fully assembled then i plugged it into the dbt turned it on and the light bulb stayed on bright so then I unplugged the red power wire from the transformer and the bulb went dim and the soft start relay clicked and the lights on the front panel lit up that's why I suspected the toroidal transformer.I now have the transformer removed and on the bench

 

[Ronito6]

Trouble shooting is the hard part.

Pics would be most helpful. A video maybe more so.

Protect those output transistors and keep the speaker switch in the OFF position until everything around the driver modules is working right.

 

[Willy6]

Trouble shooting is the hard part.

Pics would be most helpful. A video maybe more so.

Protect those output transistors and keep the speaker switch in the OFF position until everything around the driver modules is working right.

Right now I have the Mj21194g, 93g's in there.I'll post some pics later when I get home

 

[Willy6]

I believe the toroidal from g9000 won't do , the voltages might be different.

Yep voltages are different x1 toroidal transformer output voltage is 48v and the g9000 is 45v....

 

[Ronito6]

Yep voltages are different x1 toroidal transformer output voltage is 48v and the g9000 is 45v....

What a shame that is.

I asked Kale and he confirmed the incompatibility.

Maybe it's time for a lesson in: Picking the Right Toroidal for your Amp.

 

[Willy6]

What a shame that is.

I asked Kale and he confirmed the incompatibility.

Maybe it's time for a lesson in: Picking the Right Toroidal for your Amp.

I might just put the 100v one back in and buy a step down transformer to run it with.

 

[Willy6]

What a shame that is.

I asked Kale and he confirmed the incompatibility.

Maybe it's time for a lesson in: Picking the Right Toroidal for your Amp.

I was also wondering if anyone knows of a good company that rebuilds them?

 

[Ronito6]

Look at this. Note the toroids.

I'm rather certain this was created and posted to YouTube by AK member ARGOU

Here is part 1.

 

[Willy6]

Firstly 'well done' on using the DBT however I am a little puzzled by what you say, I have a few questions.

Is the amp fully assembled? - if not what is the assembly status?
The toroidal transformer should have secondary windings with a pair of greens and a pair of purples - but you say yellow ???
When you say lights come on and relays click - is it just the soft start? or speaker relay as well?
What lights come on ?
Are the output transistors connected? (driver assemblies installed ?)

OK here is how I bench tested it using my dbt.

 

[Willy6]

I connected to center tap white and power out purple and center tap black and power out Green and both sides read around 50.4v and I directly connected to blue and yellow for power to left and orange and brown to power right I get the same voltage reading if I set the adjuster to 120v and hook to power in red and brown

 

[Hyperion]

OK, so what happens if you connect from purple to purple and from green to green - what voltages do you see?

 

[Ronito6]

OK, so what happens if you connect from purple to purple and from green to green - what voltages do you see?

This is getting down to basics.

Nube Q: Do you mean apply the probe to the other green or purple wire to test that one as well to get a value, or to actually jumper both green and both purple wires together.

I imagine the former.

 

[Hyperion]

The correct way to test this would be from the centre tap of the 'purple' winding, to each purple wire, and then moving to the CT for the 'green' winding and doing the same.

While you are doing the testing make SURE none of the secondary winding wires can short to anything, especially other wires - or bad things could and will happen, first and final warning.

 

[Ronito6]

The correct way to test this would be from the centre tap of the 'purple' winding, to each purple wire, and then moving to the CT for the 'green' winding and doing the same.

While you are doing the testing make SURE none of the secondary winding wires can't short to anything, especially other wires - or bad things could and will happen, first and final warning.

 

[Willy6]

OK, so what happens if you connect from purple to purple and from green to green - what voltages do you see?

Are you saying measure between purple wire and purple wire and green to green?Both purples test 50.4v and both greens test 50.4 from center tap.

 

[JOMARK911]

This looks good to me. And In between them , the two purples should show 100,8 right?