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  1. S

    president grant low am modulation and power after reconnecting r130 and r131

    TR24 is fine. I recut the resistors lol. Doesn't seem to be bleeding so I'll try this out for awhile.
  2. S

    president grant low am modulation and power after reconnecting r130 and r131

    audio was good on both am and ssb with the resistors cut with a turner +2 mic and a cobra xl350 through an old super magnum 1/2 wave. I adjusted the mic gain on am and ssb by listening on headphones through a 148 with rf gain down and no antenna. Both seemed clear with am liking more mic gain...
  3. S

    president grant low am modulation and power after reconnecting r130 and r131

    I got a president grant with a 8719. r130 and 131 were cut, so I resoldered them, but now I have low ouput power and modulation on am. Ssb is fine. What do I need to do to remedy this?
  4. S

    how to tune this tube linear

    lol well I learned something I should have thought of before. There is no receive through the linear :whistle: I'm betting it was used with separate receiver/transmitter. Looks like I'll be spending some time reading the old copy of the Radio handbook I have or just get a bigger power supply...
  5. S

    how to tune this tube linear

    or do i need a keying circuit at all if it's direct rf in/out. Won't it just amplify the signal that's fed at the input?
  6. S

    how to tune this tube linear

    there is no relay inside the linear or rca jack on the outside of the linear.
  7. S

    how to tune this tube linear

    okay, so I'm making some slight progress with the small amount of free time I have. I got a tuner, albeit one only rated at 300 watts, and I'm working on the keying relay idea. Couldn't I use a simple dc relay powered from a power supply with the rf out of the transmitter connected to the...
  8. S

    questions about a uniden grant

    okay thanks for your help
  9. S

    questions about a uniden grant

    Okay, I was concerned about the clear goo in the top left picture, and was just trying to figure out what else had been done. I assumed the clarifier mod was done as well.
  10. S

    questions about a uniden grant

    Here are some more pics
  11. S

    questions about a uniden grant

    Purchased this today from a guy locally who said the radio was stock. Didn't take too long to figure out that it wasn't. I'm thinking it has had a channel mod done but I'm not sure what else. R131 looks to be intact so I believe the mod limiter is still there. I turned the am down a fuzz...
  12. S

    how to tune this tube linear

    I believe the rest of the taps are lower voltage. I'm okay with the 300 out as i already had a new pair of 811's sitting around. I do need to research the keying circuit and bias and see if I can attempt to do those mods
  13. S

    how to tune this tube linear

    it's a 10 henry choke
  14. S

    how to tune this tube linear

    wavrider, what all would be needed to make the linear function correctly? How much drive would this require? Can you give specifics about the bias and relay? I would like to sell it, but I'm also drawn to tubes :) so I may end up keeping it. What would the difference be in output if I put...
  15. S

    how to tune this tube linear

    Thank you very much for your help
  16. S

    how to tune this tube linear

    it's part of a silent key estate sale. There is probably a keying relay somewhere in the piles of stuff I took out of the basement, but I'm not sure I even want to mess with it. I'm by no means an electronic expert.
  17. S

    how to tune this tube linear

    here is the bottom
  18. S

    how to tune this tube linear

    I did turn it on and nothing went bang or put out any smoke :) will get a pic of the inside posted
  19. S

    how to tune this tube linear

    Here is the inside.
  20. S

    how to tune this tube linear

    I recently acquired this old tube amplifier from an estate sale, but have no idea how to tune it or test it as it does not appear to have the standard settings or knobs to tune. Any help would be greatly appreciated. Has 2 811-a and 2 3b28 tubes. Also, I'm assuming I need a vintage...