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Another China SET data point

80.62.119.121
Posted on May 13, 2014 at 02:26:25
Frihed89
Audiophile

Posts: 15703
Location: Copenhagen
Joined: March 21, 2005

The attachment refers to design and implementation flaws of an un-named 300B amp. J&K Audio Design is an Asian transformer builder (primarily).

Read for yourself. I have seen a number of such comments, but this is the first one i have documented.

Of course, J&K Audio could be wrong!

 

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RE: Another China SET data point, posted on May 13, 2014 at 04:02:20
danlaudionut
Audiophile

Posts: 5480
Location: Schenectady
Joined: June 6, 2002
 You attached the Link URL on the image URL line.
Here it is ...

DanL



 

RE: Another China SET data point, posted on May 13, 2014 at 06:43:35
Frihed89
Audiophile

Posts: 15703
Location: Copenhagen
Joined: March 21, 2005
 It still works, no? Nonetheless....

 

RE: Another China SET data point, posted on May 13, 2014 at 08:03:05
Paul Joppa
Industry Professional

Posts: 7296
Location: Seattle, WA
Joined: April 23, 2001
 None of the objections are necessarily "flaws" IMHO - depending in the implementation. Devil in the details and all that.

 

RE: Another China SET data point, posted on May 13, 2014 at 10:44:19
Geary Lyons
Audiophile

Posts: 231
Location: Lincoln, California
Joined: April 10, 2007
 IMO, This statement destroys all credibility of this particular vendor.

"Upon opening the chassis, it turned out to be a nightmare! At the end, as the design was too bad, owner preferred to just repair the amplifier and sell it. Original funds will be used to build a brand new J&K 300B SET instead (Like!)."

It is more a "data point" to not do business with J&K, based on ethical and credibility concerns, than a observation on Chinese SET builds.

Cheers,
Geary

 

RE: Another China SET data point, posted on May 15, 2014 at 07:55:54
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
 It would've been nice for the post to include frequency response and distortion at rated power at various frequencies.

A lot of what's in there is opinion. I'd rather have DC on my driver tubes as a manufacturer because you can regulate that and not worry about changes in line voltage.

DC on the 300B filaments is also helpful, if you have 110dB horns, AC just isn't going to cut it.

It looks like the big flaw here is the choice of capacitor for the low voltage supplies.

 

Thanks for that observation, posted on May 16, 2014 at 00:49:25
Frihed89
Audiophile

Posts: 15703
Location: Copenhagen
Joined: March 21, 2005
 When I saw them on the WWW, I was initially, but cautiously, interested in having them build me some SE OPTs. (I just posted on the DIY board, here). This comment of yours makes me more cautious (and so do their low prices).

 

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