Plinius III 80 watt p/c class AB Amplifier - Page 3

Butcher · 12th January 2012, 08:34 AM

Check your email Steve.

Butcher · 12th January 2012, 09:01 AM

Yerk! I figured out how to upload the schematic!

Tony.

srh · 12th January 2012, 06:54 PM

Got it. Thanks very much. Do you have any info on the pre-amp and/or its power supply arrangement? I have a 2c without a power supply that I would like to get going.
Regards, Steve.

Butcher · 12th January 2012, 07:04 PM

Er, hi Steve! I remember (from few months back) that Plinius created external preamps after the Amp/Preamp line. I would like to see a photo (maby internal and external) as I have never layed eyes on one.

You could build one... All that is inside the Plinius III amp is a +- 15V rails. It is feed to the Plinius II preamp via a DIN plug. I will post the schematic for the Playmaster 60 - 60 Power Supply Section. I would decouple ALL the capacitors with 100nF and 10nF Film type capacitors.

Tony.

Butcher · 12th January 2012, 07:08 PM

Try this...

Butcher · 12th January 2012, 07:11 PM

Also use four 1uF Tantalum, two per rail. directly across the 3 pin regulators. For decoupling. WATCH POLARITY!!!! I often blow tantalums up if I'm in a dopey mood! Especially with - rails!

Tony.

srh · 12th January 2012, 07:21 PM

Hi Tony, in the pre-amp there is a muting relay on the pre-amp output that is controlled by the poweramp. So the amp feeds + - 15v, 0v and a control signal for the muting relay. I will take some pix and send them to you tonight.
Regards,
Steve.

Butcher · 12th January 2012, 07:26 PM

Thanks Steve. In my (brown) model, the mute relay is inside the Amplifier. Therefore NOT inside my model of Preamp!

Look forward to that srh!

Oh, and I am going to take some photos of my setup (modified) Plinius II and III (brown) and post them here for preservation of these old amps. I have gotten mine to sound like s*x. A 15 year project, I learnt SO much by doing this. Thanks guys...

Tony.

Butcher · 12th January 2012, 07:45 PM

There you go...

Tony.

Butcher · 12th January 2012, 07:45 PM

Needs a paint job one day!

Tony.

12th January 2012, 06:54 PM	#23
srh diyAudio Member Join Date: Mar 2004 Location: Whangarei. NZ	Got it. Thanks very much. Do you have any info on the pre-amp and/or its power supply arrangement? I have a 2c without a power supply that I would like to get going. Regards, Steve. __________________ The older I get, the more simplicity appeals.

12th January 2012, 07:21 PM	#27
srh diyAudio Member Join Date: Mar 2004 Location: Whangarei. NZ	Hi Tony, in the pre-amp there is a muting relay on the pre-amp output that is controlled by the poweramp. So the amp feeds + - 15v, 0v and a control signal for the muting relay. I will take some pix and send them to you tonight. Regards, Steve. __________________ The older I get, the more simplicity appeals.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
80 Watt class-b amp 'L6' Ver 5.0	nyqxmfj	Analog Line Level	2	30th November 2009 06:13 AM
2500 watt class AB	hienrich	Solid State	21	4th October 2007 10:03 AM
Class AB Amplifier	USFishin	Solid State	1	28th March 2004 03:25 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier.	novtango	Pass Labs	2	21st October 2002 01:50 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

12th January 2012, 08:34 AM	#21
Butcher diyAudio Member Join Date: Oct 2011	Check your email Steve.

12th January 2012, 07:04 PM	#24
Butcher diyAudio Member Join Date: Oct 2011	Er, hi Steve! I remember (from few months back) that Plinius created external preamps after the Amp/Preamp line. I would like to see a photo (maby internal and external) as I have never layed eyes on one. You could build one... All that is inside the Plinius III amp is a +- 15V rails. It is feed to the Plinius II preamp via a DIN plug. I will post the schematic for the Playmaster 60 - 60 Power Supply Section. I would decouple ALL the capacitors with 100nF and 10nF Film type capacitors. Tony.

12th January 2012, 07:11 PM	#26
Butcher diyAudio Member Join Date: Oct 2011	Also use four 1uF Tantalum, two per rail. directly across the 3 pin regulators. For decoupling. WATCH POLARITY!!!! I often blow tantalums up if I'm in a dopey mood! Especially with - rails! Tony.

12th January 2012, 07:26 PM	#28
Butcher diyAudio Member Join Date: Oct 2011	Thanks Steve. In my (brown) model, the mute relay is inside the Amplifier. Therefore NOT inside my model of Preamp! Look forward to that srh! Oh, and I am going to take some photos of my setup (modified) Plinius II and III (brown) and post them here for preservation of these old amps. I have gotten mine to sound like s*x. A 15 year project, I learnt SO much by doing this. Thanks guys... Tony.

12th January 2012, 07:45 PM	#30
Butcher diyAudio Member Join Date: Oct 2011	Needs a paint job one day! Tony.