Richard-
The 20 KHz filter is in front of the bandpass filter and really compromises the ultimate distortion performance. But its essential for some digital measurements.
The 20 KHz filter is in front of the bandpass filter and really compromises the ultimate distortion performance. But its essential for some digital measurements.
I just found there's saler who I know sell AM51, Prince is 28000 RMB.
It's too expensive for me. 🙂
It's too expensive for me. 🙂
That isnt what I said. As I said, the link is they are both built/manufactured by the same company: Matsushita Communications Industry.
The VP7723a does IM distortion also but the lowest THD level is not as low as the -7722. I had one of the VP-7723A here but sold it because it didnt go to the absolute lowest THd level.
Both brands are good to use.
THx-RNMarsh
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shameless self Promotion 😎)
http://www.diyaudio.com/forums/swap-meet/266360-fs-vienna-audio-analyzer-panasonic-vp-7722a.html
http://www.diyaudio.com/forums/swap-meet/266360-fs-vienna-audio-analyzer-panasonic-vp-7722a.html
Shibasoku is not part of Masushita ("parent of National Panasonic"). How did you figure out they were a common company? There is limited overlap in products. Shibasoku is still made in Japan and the Panasonic test stuff was sold to a Chinese company with a weird name. I do not see the connection. Even the relays don't come from Panasonic in the Shibasoku.
The Japanese are known for copying each other aggressively to the max possible. Try to find a significant difference between a Toyota and a Nissan before 2000. But they are also fierce competitors.
The Japanese are known for copying each other aggressively to the max possible. Try to find a significant difference between a Toyota and a Nissan before 2000. But they are also fierce competitors.
Again, I didnt say they were a common company. Just who builds them. There are plenty of clues. #1 is the footnote on manuals for the Shibasoku which material is (C) by Matsushita. Read the fine print. #2 is the Panasonic has it silk screened on the rear panel. The ShibaSoku just says, on the back, Made in Japan. But I havent assumed who designed each.... though they seem to share similar design concepts and topology.
-RNM
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Masushita is or used to be a general manufacture in Japan. It is possible they did the manufacturing for Shibasoku. This would have to be verified. Names get tossed around a lot and there is no telling who manufactured what from year to year. Luxman is a very good example of this.
Years ago I had a Samsung and an RCA VCR sitting side by side on the repair bench. The only difference between them was the front panel and a few features. The idler assy was a weak part and required replacement after a few years of use. The part from RCA was 80.00 CAD. From Samsung it was 13.95 CAD. It was an identical part. Guess which one we used. And who manufactured these two separate competing brands.
Samsung is my guess.
Years ago I had a Samsung and an RCA VCR sitting side by side on the repair bench. The only difference between them was the front panel and a few features. The idler assy was a weak part and required replacement after a few years of use. The part from RCA was 80.00 CAD. From Samsung it was 13.95 CAD. It was an identical part. Guess which one we used. And who manufactured these two separate competing brands.
Samsung is my guess.
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If you look at the history of Matsushita Panasonic - Wikipedia, the free encyclopedia it was never an ODM or assembly house. Since Sanyo was started by the founders brother it makes sense they were joined at the hip and they did OEM their products to the big USA brands (most of which are now owned by Japanese or Chinese companies). But they were nowt in the business of building customer designs. That would be a Foxconn or Flextronics type of business.
Shibasoku made many different very complex and advanced video test products in small runs. That, like high end audio is an almost impossible business to farm out.
Shibasoku made many different very complex and advanced video test products in small runs. That, like high end audio is an almost impossible business to farm out.
More detailed history here.
http://www.encyclopedia.com/topic/Matsushita_Electric_Industrial_Co._Ltd.aspx
http://www.encyclopedia.com/topic/Matsushita_Electric_Industrial_Co._Ltd.aspx
Ok. Fine. What ever. Who cares! The Panasonic VP7722A, made by Matsushita Communications Industrial, are about as good and easier to find and reasonable cost.... includes both source generator and analyzer. Does the FFT for 2-5th harmonic. And, uses similar technology (if not the same) in how it works internally. Plus, it does IM as well.
The only difference is the 725D has balanced inputs as well as unbal. One might give the Panasonic VP-7722A a look if you want a great alternative and cant find a ShibaSoku 725_.
THx-RNMarsh
The only difference is the 725D has balanced inputs as well as unbal. One might give the Panasonic VP-7722A a look if you want a great alternative and cant find a ShibaSoku 725_.
THx-RNMarsh
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Here is the VP-7722A notch filter---
Seems a lot like the 725. When I compare the THD from super low generators... 725 vs 7722, they are the same.
So, a great alternative. I found it easy to get a manual for the 7722.
THx-RNMarsh
ShibaSoku is described (Wiki) as "Currently, is a sequence company...." . It might mean they work on one item at a time? Total number of employees is listed as 176.
-RNM
-RNM
A Panasonic VP-7725 ( a VP-7722A with GUI, no IMD, but balanced gen. )
... and looking for an AP SYS-2722A ( European Community based, or I would have to pay 10% customs and 20% VAT for unit AND shipping !!! )
Gary
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Its small corporate size might account for its hard to find 725. While the analyzers from Matsushita, with its 10,000 employees, has far more output and support.
The principle difference appears to be in the markets the companies sell to...... the ShibaSoku is for lab, studio, broadcast. Bal (XLR)/unbal input. The Panasonic is clearly aimed at production use. Mostly, consumer (no XLR). They have ability to store (internal battery backup) 99 front panel pre-set measurements/parameters. So with a push of the front panel button, or via GPIB, you have pre-set test setups. Some Matsushita/Panasonic models have filters for testing receivers. Such as 19kHz (FM).
THx-RNMarsh
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Matsushita, now Panasonic, has almost 300,000 employees. Levear (name reminds me of a soap company) is making the old line of audio analyzer products now.
The 7722 uses an analog multiplier and seems to get exceptional distortion performance. Which analog multiplier and what is the circuit? Would it be possible to clip and post that bit of circuitry? AP had to go down the multiplying DAC road to get there. One of the key features of the Shibasoku notch filters is that they are fixed-tuned so there are no nonlinear tuning elements.
The 7722 uses an analog multiplier and seems to get exceptional distortion performance. Which analog multiplier and what is the circuit? Would it be possible to clip and post that bit of circuitry? AP had to go down the multiplying DAC road to get there. One of the key features of the Shibasoku notch filters is that they are fixed-tuned so there are no nonlinear tuning elements.
