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Parasound P/LD-1500 schematics
Parasound P/LD-1500 schematics
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Old 25th January 2010, 11:10 AM   #1
Kabal_MSU is offline Kabal_MSU  Germany
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Default Parasound P/LD-1500 schematics

Hi guys,

I'm looking for schematics for my newly purchased P/LD-1500. I'll appreciate for any help! (This time Tony couldn't help due to vintage of preamp...)

Regards,
Kabal
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Old 26th January 2010, 06:59 PM   #2
john curl is offline john curl  United States
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Is it broken?
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Old 27th January 2010, 08:44 AM   #3
Kabal_MSU is offline Kabal_MSU  Germany
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Hi, Mr. Curl!

No. I hope it will not happen, but if it happen... I also wanted to use schematics as "Owner's Manual" to see the meaning of direct input and output.
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Old 27th January 2010, 02:15 PM   #4
john curl is offline john curl  United States
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No coupling caps on input or output.
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Old 3rd February 2010, 10:02 AM   #5
Kabal_MSU is offline Kabal_MSU  Germany
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Hi Mr. Curl!

I'm here again with some questions...

This weekend I got time to look inside of my preamp. It's great :-) Here we go with questions...

1. Am I right that direct input is being selected via relay and not via chip?
2. Don't you know/remember by chance the type of diodes used in power supply?
3. Do you have any tweak suggestions? OP amps, etc...

Regards,
Kabal_MSU
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Old 3rd February 2010, 03:17 PM   #6
john curl is offline john curl  United States
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Your questions are reasonable, but I do not have the schematic in front of me or on my computer. You should leave the diodes alone, and the op amps. The interconnecting wire is suspect, but that is beyond this website to discuss, and will only lead to big trouble around here. Keep it clean on the inside and enjoy it. That is the best that I can offer.
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Old 3rd February 2010, 03:45 PM   #7
Kabal_MSU is offline Kabal_MSU  Germany
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Hi Mr. Curl!

Quote:
Originally Posted by john curl View Post
The interconnecting wire is suspect
What are you talking about? If we're talking about the way the signal from direct input comes to main circuitry, I meant that it goes through small relay from OMRON and not through chip similar to TC9152P in my old P/HP-850.

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Kabal_MSU
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Old 3rd February 2010, 04:04 PM   #8
john curl is offline john curl  United States
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I have nothing further to contribute on this preamp.
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Old 9th March 2010, 03:55 PM   #9
Kabal_MSU is offline Kabal_MSU  Germany
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Quote:
Originally Posted by john curl View Post
Is it broken?
Hi Mr. Curl,

sorry for necro-posting , but now I need your advice.

So, just by chance I found out that my preamp runs quite hot - top cover is
about 36 - 40 Celsius. After removing the cover, I can't touch the heatsinks
next 3 - 4 minutes. I also noticed that big white capacitors on the preamp board are a little bit sooty on the side turned to heatsinks.

My question is quite simple: is it OK or not? (Unit is not blocked from above,
room temperature is about 22 Celsius.) If not - I'll appreciate for any helpful
hint! (Should I check the bias?)

Regards,
Kabal_MSU
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Old 9th March 2010, 06:07 PM   #10
john curl is offline john curl  United States
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How warm is the room?
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