Hello, honorable forum group. This is my first post, so I bow my head to you. As usual, I registered here to look for help in the problem that touched me and it is so difficult to solve that I need help of kind people and good audio professionals. So to the point - I'm happy owner of the Parasound PLD 1100 preamplifier, which unfortunately has failed. The problem started a few months ago with minor ailments in the form of quieter operation of one channel after warming up of the unit. The equipment went to the local service for inspection but this did not say anything. Just after receiving the PRE from the "review" for a few days it was OK. Then, unexpectedly, the equipment stopped working - first I checked the fuse above the power socket on the rear panel and it turned out that it was burnt. After putting on a new one and connecting it to the mains it was OK again, but only for 1 day because after returning from work next day I felt an unpleasant burning smell and immediately thought that something was wrong. Of course, my intuitions turned out to be right - unfortunately the transformer burned in the PLD 1100 :-(. I really want to save this unit, but I don't want to incur the cost of buying a new ori transformer because its cost with the replacement service exceeds the value of the equipment itself on the secondary market. My electronics engineer suggested that he will repair this transormator or select another one from the local market in Poland, but he must know the voltage parameters on the secondary side of the transformer in order to match the replacement that would be made by one of the local companies specializing in such services. Unfortunately, there is no information in the manual or service diagrams that I need to save the equipment so that it can continue to serve me and enjoy my ears. If someone has such a unit and can take measurements, I will be very grateful for Your help. With it I will be able to save this noble preamplifier. Please let me know if anyone is able to help with this problem.
This should help.
Parasound P/LD-1100 Line Drive Preamplifier Manual | HiFi Engine
Appears to be a dual 18VAC secondary, 25W or more, transformer.
You should be able to buy this standard (shielded) transformer off the shelf cheaply.
You have to check the rectifier diodes and the filter capacitors to start.
Something is causing the problem. Troubleshoot this preamp, don't just replace parts.
As you have found out, that does not work.
Parasound P/LD-1100 Line Drive Preamplifier Manual | HiFi Engine
Appears to be a dual 18VAC secondary, 25W or more, transformer.
You should be able to buy this standard (shielded) transformer off the shelf cheaply.
You have to check the rectifier diodes and the filter capacitors to start.
Something is causing the problem. Troubleshoot this preamp, don't just replace parts.
As you have found out, that does not work.
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@rayma thank You very much for Your reply.
I sent a link to this discussion to my electronics engineer who will probably find the information he needs. From the initial information, I know that, apart from the transformer, nothing has been hurt, but it will turn out after a more in-depth analysis, which will probably be carried out by AudioAzyl.
If anyone else would like to add something to the topic, please feel free to do so. Any info is welcome.
I sent a link to this discussion to my electronics engineer who will probably find the information he needs. From the initial information, I know that, apart from the transformer, nothing has been hurt, but it will turn out after a more in-depth analysis, which will probably be carried out by AudioAzyl.
If anyone else would like to add something to the topic, please feel free to do so. Any info is welcome.
Try running the unit on an external +/-24VDC power supply and see if it otherwise seems
to work well enough. Make sure that the rectifier diodes and filter capacitors are working properly.
There is a reasonable chance that something external in the circuit caused the transformer to fail.
to work well enough. Make sure that the rectifier diodes and filter capacitors are working properly.
There is a reasonable chance that something external in the circuit caused the transformer to fail.
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