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31st August 2004, 08:16 AM
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#1 |
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diyAudio Moderator
Join Date: Mar 2003
Location: searching...
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Help with VTL preamp...
Hi,
I have a VTL Integrator linestage/preamp and when connected to an amp, the speakers (woofers) moves forward and back in a random fashion. I have checked the heater supply ad found it to be ok. It is supplied ith a solid state rectifier giving an output voltage of 280V and uses 2 pieces of 12Au7. Any ideas on what I should check, obviously i'm out of ideas.  Thanks, JojoD |
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31st August 2004, 09:24 AM
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#3 |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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If its accompanied by a tearing sort of noise, then I'd point the finger at those 12AU7. If it's a slow pumping at about 1Hz that happens in phase between channels, then I'd suspect a motorboating power supply and electrolytic capacitors that have failed.
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference... |
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31st August 2004, 04:14 PM
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#4 | |
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diyAudio Moderator
Join Date: Mar 2003
Location: searching...
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Quote:
Yes yes yes! That's it! It's like 1Hz that happens exactly the same on both channels. So it's really in the psu. I forgot to include that I have already replced the tubes but still have that 1Hz pumping in and out. Ok, so I will try and connect a separate known good power supply and see if it disappears. Thanks! |
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6th September 2004, 12:55 PM
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#6 |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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Glad to be of help.
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference... |
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