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Old 11th October 2001, 08:48 AM   #1
Jason is offline Jason  Australia
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Hi,

Believe it or not, at this point in my life completing a large class A project is something I don't have enough time for. As time goes on, and I sit and listen to how badly my present tube amp drives my 88db speakers, and dream of owning a big fat class A.

I certainly look forward to having the time to sit down and construct my own 'baby', but it's not going to happen any time soon!

In the meantime, an opportunity to purchase a second hand Plinius SA-250 has come my way, obviously for a second hand price.

I was wondering if any of you had any experience or comments in regards to plinius or this amp. From the reviews I've read it sounds like it could be a good building block for my 'reference' system.

Any feedback welcome!

<a href="http://www.pliniusaudio.com/pro/pro01.htm">Product Information from the Plinius site</a>

<center>
<img src="http://www.pliniusaudio.com/secimages/photos/sa250s_lg.jpg">
<p>
<img src="http://www.pliniusaudio.com/secimages/photos/sa250in01_lg.jpg">
<p>
<img src="http://www.pliniusaudio.com/secimages/photos/sa250in02_lg.jpg">
</center>

Jason.
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Old 11th October 2001, 02:29 PM   #2
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I'd like to know where they get their heatsinks. Mmmm h-e-a-t s-i-n-k-s.
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Old 11th October 2001, 03:52 PM   #3
Jason is offline Jason  Australia
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Yeah. "Nice heatsinks". Sounds like a good line for a Tshirt ;)

The one I'm looking at is sadly finished in Matt black. I suppose it would be fopar to pull it apart and sandblast it back to silver? ;)

Then again, once I started modifications it wouldn't stop. Next would be replacing those long toggle switches, leds, and of course obligatory temperature, idle dissipation and output meters. :)
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Old 11th October 2001, 03:57 PM   #4
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the heatsinks looks better in matt black though....but anyway it's a good buy.Plinius makes fine amps.
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Old 11th October 2001, 07:31 PM   #5
paulb is offline paulb  Canada
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Wow, cool looking amp. Lots of parts in there. Reminds me of looking under the hood of a Jaguar XJ-12. I'd leave the cover off...
What are those wires sticking out? And where are the input, output, and power connections? I just see switches.
Sorry I don't have anything useful to say...just that you could buy it for looks alone.
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Old 11th October 2001, 07:55 PM   #6
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Is that a good arrangement for the Trans.? Do they interfer with eachother?

The 2 bottom pix are w/ the handles off. You can see the inputs in the backside.

[Edited by vdi_nenna on 10-11-2001 at 02:58 PM]
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Old 11th October 2001, 08:10 PM   #7
Jon T. is offline Jon T.  United States
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I own the baby of the Plinius line, the 8100 integrated. It's a great amp -- very smooth, but still detailed. The circuit topology is similar to the big class A bruisers, but it's a class AB amp.





I've heard the SA-250s several times and they're great amps, too. If you can get one for cheap, you're a very lucky man.




It might be interesting from a DIY perspective to try to reverse engineer one of the Plinius amps. They have some rather interesting design quirks.





The 4 transformers in the pictures you posted are due to the fact that they use two transformers per side: on for the positive rail, one for the negative. They claim it's better than a single large transformer per channel.





The amplifier circuit, too, is quirky. Plinius only uses NPN transistors for the output. And contrary to popular belief, they do use MOSFETs -- there's a IRF9620 in my amp, I believe as the phase splitter.





Maybe I'll try to work out the circuit some weekend when I'm free...





-Jon


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Old 11th October 2001, 09:44 PM   #8
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Having heard one of these baby's they sound tremendious, Effortless and detailed. They are indeed fine amps. That said, they do have a character to their sound that is unique to their amps. I quickly grew to like the character, as it is very subtle. It is not like any tube or other solid state amp I have heard.

Being made in a city i spent many years living in, I may be a fraction biased though.

Cheers, Adrian
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Old 11th October 2001, 11:37 PM   #9
Super is offline Super  United States
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Thats one gorgeous looking amp. I'm scared to know what the thing ways. I've seen the amp/company before, but have never seen their pricing. Anyone have any idea as to how much these things are going for? I'm just curious.
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Old 11th October 2001, 11:47 PM   #10
Jason is offline Jason  Australia
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More information can be found <a href="http://www.pliniusaudio.com/pro/pro01.htm">on the Plinius website</a>.

It weighs 145 pounds, and seems to retail for around 8,500 (US, or Australian (and in one review I read, UK pounds)). Bizarre, considering the exchange rates and shipping costs. I am looking at picking it up for about half that.

This is for me still a rediculous amount of money, but its probably not a terrible investment as I feel it should hold the price for a few years to come should I need to get rid of it (and for example, swap it for a small car ;).


[Edited by Jason on 10-11-2001 at 07:53 PM]
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