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  1. C

    Twister Amps (buyer beware)

    If you put feedback circuits on it, maybe get rid of coil/ inductor on input and put trimmers across all transformers and retune amp properly. I bet it will do better. Probably has 330 across input transformers when it should be closer to a 910pf or 1000pf. That would alleviate need for...
  2. C

    WHo Makes TWISTER Amps now?

    Looking at that amp you posted, where is the feedback circuits. Lol. It's an incomplete amp.
  3. C

    KLV-1000 - Junk - or not . . .

    I wish ppl would read the datasheet on the tubes or devices they are using. And look at rated output power. Would solve a lot of issues if they followed guidelines.
  4. C

    Amp recommendations/ box builders

    543, like you said. The average " Builder " doesn't understand biasing let alone thermal tracking. You need to track it. Otherwise as it heats up, device will start pulling some amps even while in standby. It's really not a hard design. But most are used to the Toshiba that so many have taken...
  5. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    8 transistor minimum if going for fairly clean signal. And I'm sure that radio has variable, you don't need it wide open.
  6. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    Good info. I have always done it on paper or figured out rough idea in my head. It's gotten me by so far. But I bookmarked that site for future experimentation.
  7. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    If you want something closer to 2879 flange type, look at sd2933 or sd2943. But those are 50v VDMos type devices.
  8. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    Look at device. Yes it's different style mounting flange.
  9. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    That's pep of course.
  10. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    Rf parts has them for about $33 each. Check it out. Has datasheet as well. I believe they use a pair of them in final section on some of the icom/ kenwood HF radios. Like the LDMOS stuff, not much drive is needed. 6-7 W per device
  11. C

    Have you hit the wall looking for 2879's? Here is a possible replacement

    I've had good luck with the RD100HHF1 mosfets. 12v device. Not a powerhouse. But respectable
  12. C

    Welding with a CB linear

    lol, did anyone else notice static in background? It sounded to me like the switching supplies weren't matched up correctly and fighting each other. Anyone that has stacked a bunch of these will know what I'm talking about. I wonder if he actually built the boards himself or if he is using...
  13. C

    Power Pill 60,80, and 100

    Isn't MaCom making the Motorola replacements now like the MRF454 and MRF421?
  14. C

    Amp recommendations/ box builders

    BMT does very nice clean work.
  15. C

    ldmos.....BBI

    7-10KV? I have seen 15kv and I can honestly say. That's some scary $hit.
  16. C

    Which Of thesewould you choose?

    Lol, the last 3cx3000A7 amp I worked on had a 158lb plate transformer. It was a beast. Nice big oil Caps as well. But a beast to move around.
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