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2sc1969 vs 2sc2312

Discussion in 'CB and Export Equipment and Accessories' started by jbenally33, Apr 7, 2009.

  1. jbenally33

    jbenally33 Member

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    which final is good to use and is better? 1969 is cheaper than 2312. wanted to replace finals in dx88 which uses the 2312. finals are 2078 now.


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  2. Moleculo

    Moleculo Administrator Staff Member

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    "Better?" I don't know.

    However the specs look practically identical:

    2SC2312

    2SC1969
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  3. niterider

    niterider Member

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    Why use either, with the newer transistor replacements out today.. There is kits to mod them to even older radio models, and I've seen cobra 29LTDs with 35 watts plus swing with them!!!
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  4. jbenally33

    jbenally33 Member

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    what kind of transistors
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  5. Moleculo

    Moleculo Administrator Staff Member

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    The 1969 is a great transistor and they're still widely available. You can get way more than 35 watts out of a 1969 in a Cobra29. I routinely get 45-50 out without messing with the output filter coils. Personally I like that mod the best because if you ever want to put it back to stock, it's not that hard to do.

    Anyway, if you want to go the FET route, you can use the ERF2030 for 25-30 watts or the IRF520 if you want 40-50 watts.
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  6. theshortcircuit

    theshortcircuit Member

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    You're DX88 currently has 2078s? Were these replacements?

    Once had a tech look in my radio (that wasn't bought from him) and remark that it had 2312s which to him indicated the manufactorer used a better quality of components when building the radio. He stated individually the 2312 transistor's performance was not that much greater than a 1969 to notice the difference, however in his opinion they would outlast a 1969.

    Just as some today will argue while a MOSFET may get you more watts on the meter it may not have as clean of audio and may be more prone to intolerance resulting in failure.

    What it all boils down to is; who is tuning the radio and how much they attempt to obtain with regard to component limitations.
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  7. 9C1Driver

    9C1Driver Well-Known Member

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    I think most older Galaxy 88's used the dual 1969 set-up. Yours has either been swapped out at one time or maybe Galaxy ended up with a batch or 2312's so they used em. The 2312 is slightly stronger but I doubt anyone would notice.
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  8. jbenally33

    jbenally33 Member

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    thanks for all the inputs on this matter, yes, the 2078 was an experiment that i want to try. it had 2166 in all finals. found that out after i had radio fixed. power is real low. i probably get a couple of 1969 and replace the finals now. i just wanted to find out which one was better. i just want to get it back to close to normal. don't want to do any mosfets on it, due to sound quality after these kinds of mods. Thanks everyone!
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  9. dudmuck

    dudmuck Active Member

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    Something is fishy about these numbers:
    Collector Power Dissipation (TA = +25°C), PD 1.7W
    Collector Power Dissipation (TC = +50°C), PD 20W

    That 1.7 watts looks wrong, maybe they mean 17 watts dissipation.
    Or maybe they mean 1.7 watts without a heatsink. who knows.
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  10. tdill49

    tdill49 Member

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    My Cobra 29 LTD Classic swings 30 with original final

    I did some mods to my Cobra 29 (1991) but never changed the final simply because I didn't have a 1969 handy. I set mine up for a 2 - 3 watt DK with a normal swing of 25 - 30 watts.
    What are the mods that people use to get the 45 - 50 watts out ? As far as which final is better, the final alone will not give you more output will it?
    I mean if you can't drive it any harder you can't expect a whole lot of improvement can you?
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  11. Moleculo

    Moleculo Administrator Staff Member

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    There are a number of ways to do it, but here is one:

    http://www.worldwidedx.com/radio-ra...bra-29-high-power-mod-2sc1969-transistor.html

    On that mod, some of the steps are more about audio characteristics change than the power output. Regardless, I every time I do one of these radios and put it on the air the locals say it sounds great.

    The other way to do is is to use the IRF520 FET as the final and do the appropriate mods for that.
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  12. Onelasttime

    Onelasttime Member

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    I amnot repeat not an Electronic Technician..... I apprenticed in a shop that did repair radar equipment, broadcast equipment and warranty center for most major brands of two way radio's. Unlike the guys using light bulbs and dosey meter's in shacks and truck stops with names like "Wizard" we used scopes, signal generators, etc..........no cut and snip in this shop......I routinely saw a single 2SC1969 do as much or more then two 2SC2312's or 2166's in various dual final exports compared to sigal final FCC type approved SSB radio's when doing a proper alignment or like the locals used to call it "Peak and Tweak".....LOL No radio or radio amplifer combo ever left our shop with bad wave forms, splater box any other issue's to gain some watt's on a cheap meter ever.

    Before I was allowed to touch the good stuff I did a lot of CB's.........I prob. " peaked and tweaked 500 Uniden Grants and CObra 148's for instance around this time in the early 1990's. I could routinely get 26-36 watt's of nice clean power on SSB out of either of the Uniden or Cobra's mentioned above.....The dual final RCI's could never match the power output on side band of the single final Cobra or Uniden well not stock out of the box at least"regulator issues" that is another story though. My dual final 1st gen RCI 2950 23 clean watts on SSB I can still recall how disappointed I was my friends Cobra 148 had more power on SSB. I prob. realigned that radio 5 times that night and could not get it above 23w. I give it to my boss keep in mind back then HRO sold the 2950 for $495 he got ready for it 23w's!!!

    The only reason 1969's kind of get a bad rap for durability is people over biasing them for a few more dirty nasty watt's. Heat soak climbs fast as you over bias a transistor and sound quality and inter-mod deteriorate quickly and it's ability to survive SWR spikes like wise starts to drop. I do not have access to how this transistors behaves as the heat climbs but unless designed to deal with lots of heat few transistors really behave well as you heat them up beyond their initial design specifications. No one says " I am going to design a transistor to be an RF final that Rednecks can't easily kill even over biasing them in Gerogia and Texas Heat and sending harmonics and large swinging power spikes through day in and day out from their hot car or truck!" LOL!!! So really the 1969 impressed me from the stand point of taking more abuse then the designer could have ever predicted it would need to take!

    To get any better I would want to see more gain at the same power output etc..........This way you could turn the power down let the added gain do it's job and run the componet cooler for longer life. If it had vastly better intermod I could see calling them better as well but I just not see it. Just opinion mind not like I was out testing 5000 of these to put trending data together.
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  13. ExitThirteen

    ExitThirteen Grumpy, Cranky Repairman

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    Go with a matched pair of 2SC1969's. They have to be matched, however, and make sure that what you're getting are genuine Mitsubishi C1969's. So many fakes out there. Good luck!

    ~Cheers~
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  14. AudioShockwav

    AudioShockwav Extraterrestrial Admin Staff Member

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    ( 3 year old post)
    A Pair of matched Mitsi 1969`s can still be had, but it is going to cost you, RFParts in San Marcos CA still has them for $31.90 a pair, And they are the only ones I would trust to sell you a true Mitsi Part.
    Almost everything else you find on-line now days is some re-branded Chinese fake.
    Durham radio up in Canada "might" have some left, don`t know, they are also trustworthy.
    There is a replacement called a CB-20 made by Eleflow, as far as I know there only distributor is a gentleman that goes by weazle66 on E-bay and the cost is about $6.50 each.
    To make it worthwhile you need to buy a dozen or so to bring down the cost of shipping from ($13.72) the UK, cost`s him the same to ship one or a dozen.


    73
    Jeff
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  15. Rb30

    Rb30 43WR30

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    I can vouch for weazle66
    I have got a few eleflow transistors from him and they are all good (2166 & 2312's) for my gen 1 rci 2950. He also sells a mrf477 by eleflow which will be my next purchase to fix up my old 2510
    #15


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