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When you get "Serious" about building SE amplifiers you get ones of these

72.211.138.248

Posted on February 9, 2017 at 19:30:45
used-hifi
Audiophile

Posts: 473
Location: portage IN
Joined: March 18, 2003




well when you become serious about building real good SE amplifiers you need one of these

"Digital Bridge"

Test parameters:L,C,R,ESR
Basic accuracy:0.3%-0.5%
Range Mode:Auto
Test Speed:Fast: 2.5, medium : 2, Slow: 1 (times / sec.)
Calibration function:Auto
Test terminal configuration:The BNC test line
Display:2004 LCD
Test signal frequency:100Hz, 1kHz,7.8kHz
Test signal level:1.75Vrms(max)
Test Range:
R:0.0002 Ω - 10.000MΩ
C:0.1 pF - 10000uF or more
L:0.01 μH - 1000 H


If you pickup one of these from ebpay make sure they send you the Correct power transfomrer mine came with 220v pri and it was suppose to be 110v

so I just happen to have some old totally enclosed Radioshack center tapped transformer around and mounted it outside the case close to the IEC connector In my thinking it was an upgrade :)


Lawrence

 

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I'd Rather Use a Genrad, posted on February 10, 2017 at 08:23:00
Triode_Kingdom
Audiophile

Posts: 5807
Location: Texas
Joined: September 24, 2006
The Genrad LCR Digibridge is much higher quality. More expensive, yes, but not made in China. At $200-300, the used Genrads are a "serious" bargain.


--------------------------
Buy Chinese. Bury freedom.

 

RE: I'd Rather Use a Genrad, posted on February 10, 2017 at 09:02:32
used-hifi
Audiophile

Posts: 473
Location: portage IN
Joined: March 18, 2003
Hi TK my particular model was compared directly to the very expensive agilent units the difference was .115%!

Hell they use the same Autobalancing Bridge principle just like good expensive ones :)

and for you guys needing to use an inexpensive tool to measure primary IMP this will do it!!! it will also measure the shunt capacity across choke reactor.

Lawrence

 

But for how long? Tomorrow?, posted on February 10, 2017 at 10:27:42
gusser
Audiophile

Posts: 2377
Location: So. California
Joined: September 6, 2006
"Hi TK my particular model was compared directly to the very expensive agilent units the difference was .115%!"

Getting an analog circuit to hit a specification is rather easy. Keeping it there in light of environmental as well as component aging is a totally different matter.

That's what you buy with HP, Tektronix, and other established test equipment manufactures.

 

RE: But for how long? Tomorrow?, posted on February 10, 2017 at 10:49:04
used-hifi
Audiophile

Posts: 473
Location: portage IN
Joined: March 18, 2003
yeah you go ahead by them dinosaurs of test equipment and keep paying to have then calibrated every other year...

Mine just hit a button and it calibrates itself!!


plus its NEW not some 20 year old machine that takes 20 mins to stabilize before you can even use it. you guys are missing the point its as good as the expensive stuff and if it dies in 5 years they will have an even better unit i can buy just as inexpensive and be good for however long.

really you have to look at the bigger picture plus if there was a competing USA company that made a similar product/similar price I would be all over it but we dont and so my money goes much farther in this hobby

you guys have fun

Lawrence

 

RE: When you get "Serious" about building SE amplifiers you get ones of these, posted on February 10, 2017 at 11:31:35
LinuxGuru
Audiophile

Posts: 537
Location: European Union
Joined: November 11, 2008
For a hobby Chinese products are a real budget savers.
You can find on this device here:
http://www.eevblog.com/forum/testgear/xjw01-auto-lcr-meter-review-($120-bench-top-lcr-meter)/

Additionally, there are positive feedback posts on Russian DIY forums.

PS. I'm dealing quite a lot with Chinese parts, hardware and machinery. While they may cost much less then comparable from USA, EU or Japan manufacturers, these cost savings often come with questionable precision, awkward workarounds and hackwork, buggy software. Not always, but quite often.

For example, I have Atten oscilloscope with large screen which was great for its cost (at least on paper) and comparable to Agilent at one third of the price.

It arrived in time and it works. However:

1) It's input amplifier have poor signal/noise ratio compared to Pro counterparts. Still OK because I have relatively high signal levels.

2) Software is buggy, when one try to write readings on USB memory stick, it may do so, and may not, only god knows why. Manufacturer agreed to reflash software free o charge, but request to send oscilloscope back to China, for shipping and customs at my expense both ways. It doesn't make any sense, however.

 

RE: When you get "Serious" about building SE amplifiers you get ones of these, posted on February 10, 2017 at 11:47:52
used-hifi
Audiophile

Posts: 473
Location: portage IN
Joined: March 18, 2003
I totally agree you really need to know what your getting yourself into


2 china products that are very good one is this digital LCR and another is this signal generator http://www.ebay.com/itm/221508521898?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

has a very good square wave Rise and fall time of ≤100ns perfect for amplifier testing without adding rc filter to slow it down and music is much slower then 100ns but its a good test plus this unit has real good bandwidth for audio testing/sweeping. IMO EXCELLENT

 

Calibrates it's self?, posted on February 10, 2017 at 14:02:59
gusser
Audiophile

Posts: 2377
Location: So. California
Joined: September 6, 2006
Against what? How stable is the calibration reference?

Hint, why did Dynaco choose 1.56 volts for the bias setting in their famous amps. That required a non standard cathode resistor. Why 1.56 volts?

It's all about the accuracy of the reference. Otherwise any so called calibration is relative.

Also, you only need to calibrate those old dinosaurs once a year if you are doing work that requires traceable calibration certificates. That doesn't mean they need yearly calibration to remain accurate - and surly accurate enough for hobbyist audio use.

 

RE: When you get "Serious" about building SE amplifiers you get ones of these, posted on February 10, 2017 at 14:48:43
megasat16
Audiophile

Posts: 196
Location: SoCal
Joined: April 15, 2015
Serious SET hobbyist needs LCR meter that can measure inductance of the OPT at variable frequency from 20Hz-20KHz. Any LCR meter that is fixed to measure at 100Hz/1KHz/10KHz; etc. points are not very useful IMO.

Also, variable Voltage signal of about 20Vrms and selectable Vsource of 30/ 50 /600 /1K ohms.
.
.
.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.

 

RE: When you get "Serious" about building SE amplifiers you get ones of these, posted on February 10, 2017 at 15:12:22
LinuxGuru
Audiophile

Posts: 537
Location: European Union
Joined: November 11, 2008
> Serious SET hobbyist needs LCR meter that can measure variable inductance from 20Hz-20KHz.

Certainly exists yet too expensive for hobby use.
Generator, resistor and true RMS voltmeter is enough for this purpose.The rest is simple calc job.

 

RE: Calibrates it's self?, posted on February 11, 2017 at 20:51:43
Triode_Kingdom
Audiophile

Posts: 5807
Location: Texas
Joined: September 24, 2006
Even this well-considered argument is captive to the necessity of the unit remaining functional. Chinese products carry an inherent risk of default in that regard. :)








--------------------------
Buy Chinese. Bury freedom.

 

missing link?, posted on February 12, 2017 at 06:03:07
tweakydee
Audiophile

Posts: 400
Location: Gainesville Virginia
Joined: February 27, 2004
Did you mean to post a link to a digital LCR?

 

I would not use an alkaline battery... ~nT, posted on February 12, 2017 at 07:44:01
Cleantimestream
Audiophile

Posts: 6578
Location: Kentucky
Joined: June 30, 2005
~!
The Mind has No Firewall~ U.S. Army War College.

 

RE: missing link?, posted on February 12, 2017 at 07:56:30
LinuxGuru
Audiophile

Posts: 537
Location: European Union
Joined: November 11, 2008
Look for XJW01 LCR meter on Amazon, eBay and Aliexpress. This model seems to be discontinued.
On Aliexpress they are available at around $100 but assembly is UNFINISHED, as stated in listings. I don't know what is missing.

 

RE: missing link?, posted on February 12, 2017 at 09:09:27
used-hifi
Audiophile

Posts: 473
Location: portage IN
Joined: March 18, 2003
This LCR was a "KIT" the main board was stuffed and soldered but you have to put it all together and make some cabling


Yes there maybe a new model that will/can test at 100kc but for what we do this unit is works fine. IMO every experimenter should have one just for matching R's L's C's plus so much more



Lawrence

 

RE: I would not use an alkaline battery... ~nT, posted on February 13, 2017 at 07:05:50
dave slagle
Manufacturer

Posts: 4754
Location: NYC
Joined: April 27, 2001




Alkaline batteries did not commercially exist back then.

dave

 

RE: I would not use an alkaline battery... ~nT, posted on February 18, 2017 at 12:13:22
Cleantimestream
Audiophile

Posts: 6578
Location: Kentucky
Joined: June 30, 2005
Am aware Dave... merely implying that alkaline tend to run higher voltages... in my experience.
The Mind has No Firewall~ U.S. Army War College.

 

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