The amplifier is Audison vrx 1.500.2. I've rebuild the PS section .Nothing shorted or burnt in output section.
Amp starts fine, green light, after 3 seconds RL1 (relay 1 which is nais tq-12v), or something around it starts multiple clicking, buzzing and producing awful sounds and I mean loud sounds.
Amp gradually draws more and more current and I look quickly to turn it off. Can't find anything heating up.
Removing RL1 (relay 1) nais tq-12v - removes the awkward clicking and amp draws 1.3A stable.
I've found partial schematics for the earlier revision Audison vrx 1.500 (not the Audison vrx 1.500."2") in the thread over here:
https://www.diyaudio.com/community/threads/audison-vrx-1-500-2-clamps.299921/
Am I being right that this relay turn on the output stage ?
Any ideas what to look for ? Rail voltages are fine +-70v.
Amp starts fine, green light, after 3 seconds RL1 (relay 1 which is nais tq-12v), or something around it starts multiple clicking, buzzing and producing awful sounds and I mean loud sounds.
Amp gradually draws more and more current and I look quickly to turn it off. Can't find anything heating up.
Removing RL1 (relay 1) nais tq-12v - removes the awkward clicking and amp draws 1.3A stable.
I've found partial schematics for the earlier revision Audison vrx 1.500 (not the Audison vrx 1.500."2") in the thread over here:
https://www.diyaudio.com/community/threads/audison-vrx-1-500-2-clamps.299921/
Am I being right that this relay turn on the output stage ?
Any ideas what to look for ? Rail voltages are fine +-70v.
If you touch a load across it, does the voltage drain off?
Do you see an increase in current draw with the load?
Do you see an increase in current draw with the load?
That would tend to indicate that the problem is on the driver board, in the feedback circuit or in the power supply (regulated supplies?).
I don't know anything about the driver board for this amp.
I don't know anything about the driver board for this amp.
I found the full schematics from audison for all of their Vrx series...but even in this file there is no description or anything about dhf.1 board, what is I suppose the driver for the final output section in the output amplifier.
If I start the amp without the dhf.1 board, no clicking from the relay, no dc. Power supply works fine, but of course there won't be any output without the dhf.1 board. Nevertheless this doesn't mean the board is faulty...
If I start the amp without the dhf.1 board, no clicking from the relay, no dc. Power supply works fine, but of course there won't be any output without the dhf.1 board. Nevertheless this doesn't mean the board is faulty...
510 pages about 50mb pdf file. I've tried to send it to You Perry, but the website would not let me do that.
The 560 page version (I can't post) has the dhf.1 board diagram and other information starting on page 239.