K4040 short circuited test

Good afternoon,

I’m french, so I hope you understand me :wink:

I’m building the K4040 amplifier and all seems to be good but there is one test that I don’t understand…

This is a link to the manual: clic here

On page 13, it write that to check short circuit on two connectors:

But I don’t understand if I have to check the contact between the two connectors or between each connector and the ground?

Moreover, I’ve done the two tests and I’ve a contact for each tests, that means I have a problem?
(I’ve used J26 as ground)
If you want more details, ask me :wink:

Thanks!

Best Regards.

Sgrunt

You just need to make sure that none of the two 6.3V windings are shorted, as this could destroy the transformer.

Good afternoon,

Thanks for this answer!

I’m really sorry but, I don’t understand where exactly I have to put my ohmmeter… Maybe I’m an idiot but actualy, I don’t understand the expression of the manual…

I’ve set my ohmmeter to 2000ohm and tryed 3 tests:

Test 1: image (big size) : The ohmmeter show me: 440ohm
Test 2: image (big size) : The ohmmeter show me: 440ohm
Test 3: image (big size) : The ohmmeter show me: 220ohm

That’s mean I’ve a problem? :S

For waiting, I’ve stopped the build of the amp. This is a very expensive Kit, so I don’t want to make mistakes :neutral_face:

Your help is very appreciated!

Best Regards!

PS: I’ve seen that you’re from belgium, do you speak french?

You’re measurements are correct. This is when the transformer is not connected, right?

Allowed languages for this forum are English (preferred) and French.

The power transformer isn’t connected but the two others are connected. Is it good?

In fact, I don’t undestand what they call a short circuit :S (maybe my traduction in french isn’t exact) For me, if the assembly is correct, I must have 0ohm (no contact) on my ohmmeter (at least for the third test that I’ve done). No?

If you said the measurements are correct, can I continue without risk? (because I have to turn on soon :slight_smile: )

There is others interesting tests to do that are not mentionned in the manual at this point?

Thanks very much for the help!

You can proceed, there is no problem with the 6.3VAC connectors. Please note that we cannot take responsability, we have to rely on the information you supply.
Besides the procedures mentioned in the manual, there are no other things to test.
One more thing: short circuit means 0 ohms between two points. If the manual says ‘check for shorts’ then you must make sure that there is an impedance larger than 0 ohms between two points.

Thanks very much for your help! I’ve understood now :slight_smile:

Hum… I’ve finished the connection of my amp tonight… All voltage and tests were good until the moment to put the EL34.
When I’ve switched on with EL34, little smoke was out from tubes. I directly turn off the amp when I see it. (all my bias trim were underclocked).
I’ve removed EL34 and now when I try to switch on the amp, the fuse burn :confused:

I think this kit wasn’t at my level :frowning:

1k€ gone up in smoke :confused:

Thanks for all your help :wink:

Best Regards

Maybe your Velleman distributor or a friend can take a look at your assembly.
We can take a brief look if you can provide links to HI-RES and SHARP pics of your assembly, both component and solderside.

If not, maybe it is best to return the amp for inspection/repair.
Careful: The amp is extremely fragile and warranty does not cover shipping damage.
Make sure it is extremely well packed.

Please return it to your Velleman distributor or to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

Good afternoon,

Unfortunately,I don’t have a good camera to do some pics :frowning:
But I’ll return it to a Tech department to repair it.
This probably my fault so I know that I have to pay for the reparation but, if I pay for that, is it possible to have a note from a tech to explain me my mistakes?
And not just a list of what they change.

Other question: Is there a velleman tech dept in france?

Thanks for your help!

Repair is just a fraction of the cost of the kit.
Transport is usually more expensive.
There is no service dept. in France.
The repair dept. usually includes a list of problems encountered.

Hello,

One or two weeks ago, I’ve sent my amp to the address that you’ve given to me.

But I don’t have any contact since I’ve sent it.

I don’t know if they have received it or have time to inspect my mount…

There is a e-mail address to contact this tech dept?

I couldn’t phone them because I’m not able to understand and speak in english.

Thanks if you can help me and I if you can understand my kind of english ^^

Best regards

For all info regarding your repair status, you can write to lvp (at) velleman (dot) be