1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice
Dismiss Notice
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.

HUAGAO SEMICONDUCTOR CO., LTD.

Discussion in 'General CB Services Discussion' started by unit_399, Jun 3, 2015.

  1. unit_399

    unit_399 EL CAPO

    Joined:
    Jun 17, 2008
    Messages:
    1,538
    Likes Received:
    1,124


    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 and tecnicoloco like this.

  2. Robb

    Robb Yup

    Joined:
    Dec 18, 2008
    Messages:
    11,394
    Likes Received:
    3,394
    Why so?
     
  3. unit_399

    unit_399 EL CAPO

    Joined:
    Jun 17, 2008
    Messages:
    1,538
    Likes Received:
    1,124
    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
     
    Hurricane95 likes this.
  4. firerunner

    firerunner Well-Known Member

    Joined:
    Oct 24, 2014
    Messages:
    162
    Likes Received:
    101
    Be interesting to see what you find out.
     
  5. Robb

    Robb Yup

    Joined:
    Dec 18, 2008
    Messages:
    11,394
    Likes Received:
    3,394
    Sounds OK. Why the interest in the 2SC1306/1307s? Nostalgia/restoration? Thought one can easily replace those with the 2SC2166/1969?
     
  6. unit_399

    unit_399 EL CAPO

    Joined:
    Jun 17, 2008
    Messages:
    1,538
    Likes Received:
    1,124
    I have several 858SSB radios that have 1969 finals, and I would like to restore them to stock condition. Like you said, a nostalgia/restoration thing. Also, the 1307 has a max collector current rating of 8A. The 1969 and 2312 only do 6A. I never push my radios to the max, but I like the extra headroom the 1307 affords.

    - 399
     
    bobl9355, NZ8N, rabbiporkchop and 2 others like this.
  7. Robb

    Robb Yup

    Joined:
    Dec 18, 2008
    Messages:
    11,394
    Likes Received:
    3,394
    I never looked at the specs of the 1307; but now that makes sense.
    Thanks . . .
     
    NZ8N likes this.
  8. Crusher

    Crusher Well-Known Member

    Joined:
    May 12, 2007
    Messages:
    822
    Likes Received:
    324
    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.
     
  9. unit_399

    unit_399 EL CAPO

    Joined:
    Jun 17, 2008
    Messages:
    1,538
    Likes Received:
    1,124
    I hope so too. When the order gets here, I will post whatever I find out.

    - 399
     
    222DBFL and Mudfoot like this.
  10. BBB

    BBB Well-Known Member

    Joined:
    Jan 17, 2012
    Messages:
    744
    Likes Received:
    396
    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.
     
    #10 BBB, Jun 3, 2015
    Last edited: Jun 3, 2015
  11. BBB

    BBB Well-Known Member

    Joined:
    Jan 17, 2012
    Messages:
    744
    Likes Received:
    396
    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.
     
  12. StrangeBrew

    StrangeBrew Sr. Member

    Joined:
    Aug 15, 2011
    Messages:
    779
    Likes Received:
    722
    Badda-BUMP

    Gatekeeper amps has a couple videos on youtube in regards to the HG2879's



    Anyone know anything about Gatekeeper?
     
  13. rabbiporkchop

    rabbiporkchop Sr. Member

    Joined:
    Jan 18, 2007
    Messages:
    1,830
    Likes Received:
    727
    Doesn't have a technical background. He copies other people's work.
     
    543_Dallas likes this.
  14. LeapFrog

    LeapFrog Wielding Hanlon's Razor

    Joined:
    Feb 15, 2016
    Messages:
    1,695
    Likes Received:
    829
    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!
     
    #14 LeapFrog, Jul 9, 2016
    Last edited: Jul 9, 2016
    rabbiporkchop likes this.
  15. 543_Dallas

    543_Dallas Sr. Member

    Joined:
    Jul 25, 2011
    Messages:
    2,854
    Likes Received:
    3,964
    Needs to trim his fingernails too.
     
    rabbiporkchop and Mudduckmobile like this.

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!