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  1. C

    donkeystomper amps

    Hey 543, not all copies are right. Some of the relay placements and extra long leads mess with the circuit. All are not created equal. But you knew that. But a lot of thes e guys don't
  2. C

    erf7530 mosfets

    I'm sure the 448 they mentioned cost more than a dollar or 2.
  3. C

    erf7530 mosfets

    Interesting on the 260n. Almost twice the gate capacitance as the 250n. Interesting to build an amplifier using 2 of each. See what happens. You know on the LDMOS amps, they have been able to parallel several. I wonder if same could be done with these.
  4. C

    erf7530 mosfets

    A lot of input capacitance.
  5. C

    erf7530 mosfets

    They are dirt cheap too
  6. C

    erf7530 mosfets

    http://www.ebay.com/itm/180W-Linear-SSB-CW-Power-Amplifier-amp-Kits-For-Transceiver-Intercom-Radio-HF-/311465270121?hash=item4884c6db69:g:vrwAAOSwAYtWH43I Looks like a irfp250n? Hmmm.
  7. C

    erf7530 mosfets

    You should look at eBay stuff. Some of the Chinese stuff is using some mosfet stuff that looks similar to erf7530. I bought some last year, but never did anything with.
  8. C

    erf7530 mosfets

    The erf7530 is in a TO-218 case. Much bigger than a to-220 case.
  9. C

    erf7530 mosfets

    Haven't paid attention to these in a year or so, looks like they are non existent now. Guess I'll sit on the few I have left.
  10. C

    Quick and Dirty Class "AB" mod for KL300p

    I still like the Motorola design I modified. Holds steady. No fluctuation in voltage. Glad to see you on here Bob
  11. C

    Strait 4 pill pp100s Xforce 400hd possible bad relay or popped pill?

    If you put new transistors in, might wanna check tuning. Pp100 transistors tune a little different. Not all the capacitor parts may be the same needed for Toshiba 2879's.
  12. C

    Ferrite Transformers, Core Material Type for 28 Mhz operation (43 or 61)?

    Since you don't want to take the time to understand the differences like permeability. Are you actually building amp or copying off of another's design? Just wondering because of tuning. Also if you are building for 28mhz/ 10M. Hopefully going more for quality. Not quantity. Are you going to...
  13. C

    Ferrite Transformers, Core Material Type for 28 Mhz operation (43 or 61)?

    Since you stated only those 2 materials, yes 61 is better. But on output, you may also want to play with 67. I have used that on some of the LDMOS stuff with great results.
  14. C

    Replacement 2879's

    You could also try using Macom MRF454 or MRF421.
  15. C

    Replacement 2879's

    4 years ago I had really bad luck with them. But I have had friends buy from them recently. Within last few months and it seems they have gotten their act together. So far no issues. Don't know if they have tried biasing them yet.
  16. C

    HUAGAO SEMICONDUCTOR CO., LTD.

    I think you are forgetting, LDMOS are not forgiving when it comes to overdrive. On the inputs they are not forgiving. Overdrive them just a little and pop. They will easily destruct and I mean easily. Example blf188. 3-4w pep drive is all that is needed. I overdrive one twice with 6w pep and...
  17. C

    Welding with a CB linear

    Lol, he's trying to keep the heat inside.
  18. C

    Twister Amps (buyer beware)

    Lol, it's going to take a lot of work to get it where it needs to be.
  19. C

    Thinking outside the box

    CK hit the nail on the head. The average CB user just cares about wattmeter readings and price. The cheaper the better.
  20. C

    Twister Amps (buyer beware)

    The 5-10pf part I was referring to the input circuit. The input plays a major part in these amps for both effiency and cleanliness of signal
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