K4000

Kits Audio Hi Fi Projects
1

My Problem is the outputsignal of may K4000. You can hear the highs rightly good, but there is no power on the bass. when you turn lauder, the bass crashes totaly down.

Here is the Voltage-Check

without any Velves - Speakers on 8ohm output - Input open

6,3 Terminal: left = 6,15VAC right = 6,15VAC

Fuseholder F2 and F3 : 407VDC

with Valve 12AU7 at V6 and ECC83S on V5 left and right:

left right
+V1 403VDC +V1 403VDC
+V3 356VDC +V3 352VDC
-V -45VDC -V -44VDC

point 3 on soket V1 trough V4

left = 403VDC right = 403VDC

with every valve:

TP1 through TP4…left and right 0,4VDC

left right

+V1 389VDC +V1 389VDC
+V3 343VDC +V3 340VDC
-V -50VDC -V -44VDC

6,3 Terminal : 5,98VAC left and right

Terminal for output-Transformator:

left
violett, green, black, black, brown, orange = 388VDC on ground each

right
violett, grenn, black, black, brown, orange = 386VDC on ground each

without E34L:

left
Violett, green, black, black, brown, orange = 403VDC on ground each

right
violett, green, black, black, brown, orange = 403VDC on ground each

I hope you can help me now.

Thanks

Fritz

2

Please do not start a new topic for each reply.

These voltages look normal.
‘No power on the bass’ is subjective.
What speakers are you using and what are their specs ?
At this time, we cannot determine if there is anything wrong or not.
If you have an oscilloscope at your disposal, you could check if there is oscillation or other problem at low frequencies.
If not, you can return the amp for inspection.
If you decide to return it, make sure it is well-packed, as we cannot take responsability for damage during shipping.

3

I send it to you, that you can check it! Please send me the adress.

Thank you for help!

Fritz

4

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

Make sure that it is extremely well packed !!
We do not accept responsability for damage or loss !!
Hint: Have it insured for damage and/or loss

5

Hallo.

Do you get the Amplifier?

6

Please use the proper channels for repair info.
You can contact the repair dept. at lvp@velleman.be