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DEI Transistors
- Thread starter Drifter
- Start date
Just as I suspected. Quite a difference when you pop the hood on these two 2879's. Not too hard to see absolutely zero effort was made to simulate a 2SC2879. Just look on the shelf for some existing bipolar transistor that could be re-stamped as a counterfeit 2879 and market it. It's not that I hold China responsible for taking advantage of the opportunity our incompetence has offered them. It's that many Chinese companies are very eager to lie and cheat their way into the market place. That creates an unfair advantage that allows them to force companies like ASI out of the marketplace. Preventing us from being able to purchase a real 2879 replacement today.
I own both a TS Sweet Sixteen with Toshiba transistors and a newer unit with the DEI transistors. Running both at 14 vdc there's about a 150 watt difference in output with the same drive level into a 50 ohm dummy load. DEI's draw less current. Running the collector voltage to 15.5 vdc the difference in output is about the same. Conclusion the DEI's don't have the same gain obviously, but continue to amplify fairly linear.
Didn't see any real RFI as a result of the DEI's nearing saturation. Toshiba's are better but will still get dirty when pushed. You want more head room then buy the Toshibas. The DEI's have their limitations but appear to perform as specified. I've been running a DEI based TS SS for more than a year on a 300 amp supply set at 15vdc. It's my base amp and have had it up to 16 vdc and it still going strong. Guess I got lucky. Funny thing is I just bought a new TS DX1600X and it too handles the increased collector voltage just fine too. Seeing 1400 watts output so I'm happy.
Didn't see any real RFI as a result of the DEI's nearing saturation. Toshiba's are better but will still get dirty when pushed. You want more head room then buy the Toshibas. The DEI's have their limitations but appear to perform as specified. I've been running a DEI based TS SS for more than a year on a 300 amp supply set at 15vdc. It's my base amp and have had it up to 16 vdc and it still going strong. Guess I got lucky. Funny thing is I just bought a new TS DX1600X and it too handles the increased collector voltage just fine too. Seeing 1400 watts output so I'm happy.
One local runs a Texas Star 1200 w/DEI's. He had to send it in TWICE to have it repaired w/ new pills. Less than one year in time - BTW . . .
Yes it works.
For a while . . .
Yes it works.
For a while . . .
The 14-4q batch so far seems like a much better run. I think they made some changes. But from what I have seen this production run is much better.
NTE has a replacement for the 2sc2879, look up NTE470. Unlike the DEI transistors NTE has a data sheet for their product and they are made in the U.S ( N.J ).
NTE makes only three things:
Money.
A cross-reference book.
And packaging of remarked components.
This has been their business model all along. Buy parts, scrub the original markings and print a new "NTE" number on it.
They are a marketing company. They do not own a factory.
73
Money.
A cross-reference book.
And packaging of remarked components.
This has been their business model all along. Buy parts, scrub the original markings and print a new "NTE" number on it.
They are a marketing company. They do not own a factory.
73
NTE also mean " Never Trust Everything" you read on the specification sheets.
you are correct, they are just a supplier and I was misinformed about us made products, with that being said all of the parts I have used with NTE logo have been good parts. I mentioned the nte ones to see if anyone has tried them yet. ( fell for the RF parts calling DEI replacements for Toshiba) I just couldn't see spending $104.00 per transistor without some other info than just a data sheet. Thanks for correcting my error. 73's
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Read this thread with great interest, always wondered why the same amp or export radio manufacturer still shows the same output figures when they changed over to DEI transistors from Toshiba and still charge the same price for the privilege.
Ive seen some using HG tranisistors now, maybe they are an improvement over the dei.
Ive seen some using HG tranisistors now, maybe they are an improvement over the dei.
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Just say no to DEI's. If it worth owning then fix it right with the best parts you get and then take care of it. I have some HG's but have not had them long enough or seen enough of a sample size to recommend them to anyone else. Amirtron was using DEI's and a bunch of other Chi-Com parts from questionable sources in their ALS-500 and between transistors and voltage regulators they where popping like Ovile Redenbacher popcorn!!! LOL Jiffy-Pop had nothing on them.
First I am not against Chinese made parts or good but they will sell you whatever you ask for. If dirt cheap is what you want that is what they will give you! Quality control cost's more! They do have nukes, a space program, stealth fighter's, automotive industry and all of our electronics from computers to appliances are made there!
So with the above said some companies and brands do a better job than other's!
Since we can still get good parts you should use them while you can. It will not be long and the supplies will be all dried up just like good SSB CB's and everyone will be crying and talking about the good old days.
If you really want cheap you can get a MP of HG's for less than the price of 1 2SC2879 how much cheaper do you want? Always better to either get a part that the OEM is willing to put their name on or a part that someone else is doing the quality control on for you like RF Parts HG house brand 2SC2879. DO not use cheap ceramic disc caps in place of silver dipped mica or metal clads. DO not use Chinese any name lytics unless you have no choice! If you use generic parts test every single part before you use it because at the price that high power rf bjt's are at it is stupid to blow one over the price of a cap, resistor or diode! Just some advice! If you do not have money to waste only buy from reputable dealers.
First I am not against Chinese made parts or good but they will sell you whatever you ask for. If dirt cheap is what you want that is what they will give you! Quality control cost's more! They do have nukes, a space program, stealth fighter's, automotive industry and all of our electronics from computers to appliances are made there!
So with the above said some companies and brands do a better job than other's!
Since we can still get good parts you should use them while you can. It will not be long and the supplies will be all dried up just like good SSB CB's and everyone will be crying and talking about the good old days.
If you really want cheap you can get a MP of HG's for less than the price of 1 2SC2879 how much cheaper do you want? Always better to either get a part that the OEM is willing to put their name on or a part that someone else is doing the quality control on for you like RF Parts HG house brand 2SC2879. DO not use cheap ceramic disc caps in place of silver dipped mica or metal clads. DO not use Chinese any name lytics unless you have no choice! If you use generic parts test every single part before you use it because at the price that high power rf bjt's are at it is stupid to blow one over the price of a cap, resistor or diode! Just some advice! If you do not have money to waste only buy from reputable dealers.