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HUAGAO SEMICONDUCTOR CO., LTD.

unit_399

EL CAPO
Jun 17, 2008
1,651
1,529
173
ALEJANDRIA, COLOMBIA SA


2011915162638627.jpg
Huagao Semiconductor Co., Ltd. is a Chinese high-tech company which has passed the standard attestation of ISO 9001:2008 Quality Management Systems. We focus on the R & D and manufacturing of RF power transistors including related ceramic packages. We boast the manufacturing history of RF power transistors for 20 years. We are well-known in China...


This company looks pretty promising. Extensive line of RF power transistors, including 2SC 2166, 1969, 2312, and 2879. VERY competitive pricing. I've placed an order for an assortment for testing and evaluation. I will post the results. Wish they had a 2SC 1306/1307.

http://www.hgsemi.com/



- 399
 

Robb

Yup
Dec 18, 2008
11,433
3,566
323
Silicon Valley CA, Storm Lake IA

View attachment 15846
Huagao Semiconductor Co., Ltd. is a Chinese high-tech company which has passed the standard attestation of ISO 9001:2008 Quality Management Systems. We focus on the R & D and manufacturing of RF power transistors including related ceramic packages. We boast the manufacturing history of RF power transistors for 20 years. We are well-known in China...


This company looks pretty promising. Extensive line of RF power transistors, including 2SC 2166, 1969, 2312, and 2879. VERY competitive pricing. I've placed an order for an assortment for testing and evaluation. I will post the results. Wish they had a 2SC 1306/1307.

http://www.hgsemi.com/



- 399
Why so?
 

unit_399

EL CAPO
Jun 17, 2008
1,651
1,529
173
ALEJANDRIA, COLOMBIA SA
Robb -
Huagao Semiconductors are very popular here in the electronics repair trade. From what I've been told, they have the performance and quality of OEM parts. At least in the commercial audio equipment field. No one I know seems to have had any experience with their RF transistors, so I thought I would give them a look-see. It would be nice to have a source for NLA devices other than RF Parts and Ebay (and their high pricing).

- 399
 
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Crusher

Well-Known Member
May 12, 2007
838
370
73
That looks like the HG Semi transistors I bought about 4 or 5 years ago. I hope their quality control is better than it was then. I got 1 key out of a pair of 2879's. Only used a 2w DK. They blew on second key.
 

BBB

Well-Known Member
Jan 17, 2012
744
402
73
Huagao 2sc2879 spec sheet found here:

http://www.hgsemi.com/UploadFiles/20119605454164.pdf

I understand they can print whatever they fancy and lie at will. Here is a report of their MRF477's in a RF amp from their site:

http://www.hgsemi.com/case.asp?id=1

And a review from a Ham operator that put them in his Emperor TS-5010 :

http://www.hgsemi.com/case.asp?id=13

They list 2sc2290's at @ $17 ea. and the 2sc2290A'a at @ $22 ea. I'm not sure what the difference is between the the two yet. The SD1446 list at @ $18 ea. The 2sc2879's list at about $20 ea. If these pan out, we should do a group buy for a discount. If they're fakes, forget it.

Hopefully there is enough demand for these 2879's transistors to get them closer to the old Toshiba specs in the field. The Chinese tube makers seemed to get the 3-500zg tubes right, so why can't they get these right.
 
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BBB

Well-Known Member
Jan 17, 2012
744
402
73
Too good to be true? Word on other forums is that these HG made 2879's are not any good yet. Don't have any so I can't say for sure... just parroting. Let us know what you find either way.
 

LeapFrog

Wielding Hanlon's Razor
Feb 15, 2016
1,706
877
123
Near Tampa, Florida
Doesn't have a technical background. He copies other people's work.
To be fair, many 11 meter amplifier builders copy a very old design. I'm curious who first engineered this classic design?

Time will tell if the qc is really any different.

Some serious side-by-side testing with original Toshibas is in order.
I mean tests done in a scientific manner, not here's my 4 x 2sc2879 box with HG transistors, now here it is with Toshiba transistors. Those are simple watt meter tests, not enough control over the variables to provide significant data, just a crude way to show the gain.

I think it's great and all that the pp100 & HG transistors are on the market (good for replacing burnt parts "on the cheap") but to be honest I think it's about time we (as a whole) stepped into the 21st century when it comes to amp design, more efficient components have since been created.
JMHO
EDIT: And I just about bumped a 1 year old thread... Doh!
 
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