Parasound P/LD-1500 schematics

Kabal_MSU · 25th January 2010, 11:10 AM

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

john curl · 26th January 2010, 06:59 PM

Is it broken?

Kabal_MSU · 27th January 2010, 08:44 AM

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.

john curl · 27th January 2010, 02:15 PM

No coupling caps on input or output.

Kabal_MSU · 3rd February 2010, 10:02 AM

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

john curl · 3rd February 2010, 03:17 PM

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.

Kabal_MSU · 3rd February 2010, 03:45 PM

Hi Mr. Curl!

Quote:

Originally Posted by john curl

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.

Regards,
Kabal_MSU

john curl · 3rd February 2010, 04:04 PM

I have nothing further to contribute on this preamp.

Kabal_MSU · 9th March 2010, 03:55 PM

Quote:

Originally Posted by john curl

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 - 40º 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 22º Celsius.) If not - I'll appreciate for any helpful
hint! (Should I check the bias?)

Regards,
Kabal_MSU

john curl · 9th March 2010, 06:07 PM

How warm is the room?

25th January 2010, 11:10 AM	#1
Kabal_MSU diyAudio Member Join Date: Oct 2009	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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26th January 2010, 06:59 PM	#2
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Is it broken?

27th January 2010, 08:44 AM	#3
Kabal_MSU diyAudio Member Join Date: Oct 2009	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.

27th January 2010, 02:15 PM	#4
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	No coupling caps on input or output.

3rd February 2010, 10:02 AM	#5
Kabal_MSU diyAudio Member Join Date: Oct 2009	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

3rd February 2010, 03:17 PM	#6
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	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.

3rd February 2010, 04:04 PM	#8
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	I have nothing further to contribute on this preamp.

9th March 2010, 06:07 PM	#10
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	How warm is the room?

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