Plinius III 80 watt p/c class AB Amplifier - Page 3 - diyAudio
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Old 12th January 2012, 08:34 AM   #21
Butcher is offline Butcher  New Zealand
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Check your email Steve.
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Old 12th January 2012, 09:01 AM   #22
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Yerk! I figured out how to upload the schematic!

Tony.
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File Type: jpg Plinius Amp - Schematic ORIGINAL.jpg (514.4 KB, 560 views)
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Old 12th January 2012, 06:54 PM   #23
srh is offline srh  New Zealand
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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.
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Old 12th January 2012, 07:04 PM   #24
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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.
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Old 12th January 2012, 07:08 PM   #25
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Default Playmaster 60 - 60 Schematic (Power Supply)

Try this...
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File Type: jpg Playmaster 60 - 60 Schematic (Power Supply).jpg (51.6 KB, 512 views)
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Old 12th January 2012, 07:11 PM   #26
Butcher is offline Butcher  New Zealand
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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.
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Old 12th January 2012, 07:21 PM   #27
srh is offline srh  New Zealand
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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.
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Old 12th January 2012, 07:26 PM   #28
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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.
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Old 12th January 2012, 07:45 PM   #29
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Default Some photos I'd like to share.

There you go...

Tony.
Attached Images
File Type: jpg Back view (mains filter).jpg (38.7 KB, 394 views)
File Type: jpg DC offset (mod).jpg (64.0 KB, 323 views)
File Type: jpg Front view.jpg (32.5 KB, 306 views)
File Type: jpg Inside view.jpg (66.5 KB, 178 views)
File Type: jpg Power supply view (mains filter, bridge heatsinks).jpg (67.2 KB, 185 views)
File Type: jpg Side view (PCB).jpg (57.6 KB, 227 views)
File Type: jpg Star ground (mod), isolating preamp from power amp diodes (mod) - Birds Nest!.jpg (74.3 KB, 225 views)
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Old 12th January 2012, 07:45 PM   #30
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Needs a paint job one day!

Tony.
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