Just recieved a plinius 2b pre that has been rather badly 'fixed', mainly re-soldering some dodgy PCB tracks. Anyway.... in the process things would appear to have gone badly wrong. Anybody have a schemtic for this otherwise very tidy preamp so I can bring her back from the dead? Ta in advance.
ooops, anyone with scematic for Plinius IIb pre will need this brasses@xtra.co.nz to send it to. Ta much
Hi Tony, I am a Avionics engineer at Air NZ and fix amps for my mates I do love the old stuff as we can relate to it. The Plinius IIc and Plinius VIIb combination from 1984 landed with me. Please if jou have a schematic for the VIIb power amp. Email tierventer@xtra.co.nz
Plinius VIIc
Just answering my own question, I confirm that the Schematic for the III is good for the VIIIc. I traced it out only diff is that the power supply feed tru the emitter resistors to the rails. Will post the Schematic for others to use plus pictures. Keep a lookout! Also the drivers and output transistors are the Toshiba ones that is now obsolete 2SA1302 and 2SC3281 Be warned there is some fake ones out there!
Just answering my own question, I confirm that the Schematic for the III is good for the VIIIc. I traced it out only diff is that the power supply feed tru the emitter resistors to the rails. Will post the Schematic for others to use plus pictures. Keep a lookout! Also the drivers and output transistors are the Toshiba ones that is now obsolete 2SA1302 and 2SC3281 Be warned there is some fake ones out there!
I think you'll find that the early Plinius amps, early 1980's, are a slightly simplified Tigersaurus amp copy.
http://www.diyaudio.com/forums/soli...ersaurus-250w-amp-simulation.html#post2594809
http://www.diyaudio.com/forums/soli...ersaurus-250w-amp-simulation.html#post2594809
Happy new year... looks like this thread has stalled so Ill add my 2cents..
Ive been given a IIc preamp without PS so I did some digging and found that there are 2 different voltage options +/-23 and +/-33 (see Plinius Tech Note..) . The S/N 68985 so I assumed the option for this unit was 33V... after setting up a low noise adj PS at 33V and plugging it in I find the output driver transistors running VERY hot so I quickly wound the PS down to 23 only to find the muting relay dropped out..?
Adjusting the PS up to 25V seemed to work fine although the transistors feel warm (but not hot..) this IMO is unusual when you consider 2N5087 are only rated for 0.6W.. so my question is can someone assist with a schematic and/or any advice on how to proceed with this.
I plan to give this a full recapping with ELNA and a few extra tweaks here and there - def the PS PCB tracks are well in need of attention
Ive been given a IIc preamp without PS so I did some digging and found that there are 2 different voltage options +/-23 and +/-33 (see Plinius Tech Note..) . The S/N 68985 so I assumed the option for this unit was 33V... after setting up a low noise adj PS at 33V and plugging it in I find the output driver transistors running VERY hot so I quickly wound the PS down to 23 only to find the muting relay dropped out..?
Adjusting the PS up to 25V seemed to work fine although the transistors feel warm (but not hot..) this IMO is unusual when you consider 2N5087 are only rated for 0.6W.. so my question is can someone assist with a schematic and/or any advice on how to proceed with this.
I plan to give this a full recapping with ELNA and a few extra tweaks here and there - def the PS PCB tracks are well in need of attention
Hi there,
as French dealers do not show any interest into being of any helpto solve my problem don't hesitate to mail if you can
I am looking for PLINIUS SA 50 MKIII / SA 100 MKIII schematic.
Best regards and happy new year .
Rock
I may be able to help but I'm away on holidays at present.
Hi there - resurrecting this thread AGAIN.
Im in NZ and I just scored a Plinius IIc. It needs a lot of work including building a powersupply. The pdf at post #73 above was VERY useful - thanks.
Im wondering about the mute relay activation - if I feed that particular pin the required voltage, that shoudl hold it closed? thanks again.
Im in NZ and I just scored a Plinius IIc. It needs a lot of work including building a powersupply. The pdf at post #73 above was VERY useful - thanks.
Im wondering about the mute relay activation - if I feed that particular pin the required voltage, that shoudl hold it closed? thanks again.
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