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Author Topic: The Per-Anders Sjostrom QRV-08 Appreciation thread  (Read 7684 times)

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AstralStorm

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #10 on: January 13, 2014, 07:48:24 AM »
Considering it has so high frequency response (even with filter), does it amplify the dreaded GPRS signal?
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Hroðulf

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #11 on: January 13, 2014, 08:04:42 AM »
Agree on the small 'lytics - the pads are okay for oven soldering, but for hand soldering you have to be extra careful to not cover up the other pad when sliding on the can. Sjostrom's buffer boards (also highly recommended) are better as the pads are longer.

The board design is sound with some traces being a bit too close for comfort to pads that must not be connected. Some markings are a bit harder to decipher, but all in all it's understandable for such a densely populated board.

As for the QRV-01... TEMPT ME NOT, HEATHEN!

But seriously, I'm not convinced it will be better than the 08. Also it looks like PA isn't too eager to deal with them judging by the price of the board.
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Hroðulf

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #12 on: January 13, 2014, 08:11:06 AM »
Quote from: AstralStorm on January 13, 2014, 07:48:24 AM
Considering it has so high frequency response (even with filter), does it amplify the dreaded GPRS signal?

I haven't noticed any audible artifacts and I don't have an oscilloscope at hand to check higher frequencies. I was able, however to make it oscillate by using improper grounding and long cruddy wires.
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AstralStorm

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #13 on: January 13, 2014, 08:19:56 AM »
Oh, so it can be made to oscillate by BA IEMs most likely - they have high capacitances in the drivers and crossovers.

(Of course it is too high gain for these anyway.)
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Hroðulf

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #14 on: January 13, 2014, 08:24:18 AM »
No dice with my SM3v2. Plays nicely with them.
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Hroðulf

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #15 on: January 22, 2014, 09:08:05 PM »
Finally found a dac that's worthy to complement the Swede.

http://www.customworks.cz/dac/dac_1/

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funkmeister

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #16 on: January 23, 2014, 04:10:52 AM »
You need to start a thread on that DAC if you put one together.
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peranders

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #17 on: January 31, 2014, 06:52:44 PM »
RudeWolf, well done. Not many in the world has this amp so it's quite unique and pretty hardcore when it comes to soldering. For those who might don't know, I am the person behind this design.
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shipsupt

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #18 on: January 31, 2014, 07:24:04 PM »
Welcome to our little place on the inter web Per.  Seems you've got some fans here, and others really interested in the stuff you're designing.   :)p1

Got anything really cool brewing?

Thanks for stopping in!
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fishski13

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Re: The Per-Anders Sjostrom QRV-08 Appreciation thread
« Reply #19 on: January 31, 2014, 08:55:26 PM »
Welcome PA!
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