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Yaesu FT-101EE

Discussion in 'Ham Equipment' started by Radio Tech, Aug 7, 2009.

  1. Radio Tech

    Radio Tech Radio Operator

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    Ant one have any good quality pictures of the bottom side of this rig?
    Or have a rig torn down at the moment?



    Had one come into the shop today with the final tubes removed. one was cracked. He had took it to another tech that just started pulling stuff out and he stopped him. There was a burnt component under the tube socket that has been removed. By looking at the two pieces I can not tell if it was a resistor or a diode let along just where it was mounted at.

    Oh, has anyone ever replaced the 6JS6 with 6KD6? My info says they are the same.
     
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  2. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    They are quite similar but be aware that pin 9 of the 6KD6 is connected internally to the grid while the same pin on the 6JS6 has no internal connection.
     
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  3. Sonwatcher

    Sonwatcher Administrator

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    I just checked a tube database and it lists the 6KD6 as a substitute. You could go here-

    NJ7P Tube Database Search

    and compare the specs of both tubes. I was also told that the 6LB6 works .
     
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  4. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    I couldn't find my cross referance so I just compared the specs of both tubes. They are very similar in specs and should be interchangable. In fact the 6KD6 has 33 watts plate dissapation compared to the 6JS6's 30 watts. The 6KD6 makes a nice litte RF amp tube. When I was still in school I built a small amp using a pair of them and ran an easy 100 watts on SSB with it.
     
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  5. Sonwatcher

    Sonwatcher Administrator

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    Garth, how do you think the 6LB6 compares to the 6JS6C ? I was told by someone they have used this tube as a direct substitute.
     
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  6. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    My old Sylvania tube manual shows them to be quite compatable,in fact they have the exact same pin-outs. the 6KD6 has the pin 9 to consider as I mentioned above. I would at least try either the 6KD6 or the 6LB6 but do it in pairs. NEVER mix tube types.
     
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  7. Sonwatcher

    Sonwatcher Administrator

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    Thanks !:)
     
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  8. MisterFatty

    MisterFatty Poppin Fresh!

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    There has been quite a few discussions on Tube subs for the 101, I would suggest Googling the subject before making any decisions on the matter. I will say from experience, because the tube us listed as a sub does not mean it will work well in a particular circuit.
     
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  9. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    That's why I look at the individual tube specs and compare them rather than rely on a simple yes/no answer regarding subs.
     
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  10. MisterFatty

    MisterFatty Poppin Fresh!

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    Even when you do this it is not enough with this radio, it just does not work well with any tubes that spec close/the same..

    The 101 can be a crapper, and it IS worth a little Research before changing the tubes for it.
     
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  11. Sonwatcher

    Sonwatcher Administrator

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    When changing to an American tube from the original Japanese tubes there has to be a modification done to the neutralizing circuit .

    http://www.qsl.net/nw2m/ft101.html
     
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  12. Sonwatcher

    Sonwatcher Administrator

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    This is another comment from RFParts-

    Read This Before Installing Tubes
     
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  13. MisterFatty

    MisterFatty Poppin Fresh!

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    Yes thats common knowledge, was a factory service bulletin regarding the cap change... You'll have to dig a bit deeper for the discussion on various sweep tubes as replacements for the 6JS6.. Even the swap for 6146 tubes can be problematic..

     
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  14. Radio Tech

    Radio Tech Radio Operator

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    QRN, I saw the pin 9 difference. I was thinking that it would not be a problem since the Yaesu has this pin socket open. There is nothing connected to it. I just checked the one tube that is not cracked and it shows 90 percent with no shorts. So going to look around and see if I can find another to match it.



    EDIT
    After going through a box of NOS tubes I picked up a few months ago I found three 6JS6. They check good so tube is not a problem now.



    Still trying to track down the missing component.
     
    #14
    Last edited: Aug 7, 2009
  15. Sonwatcher

    Sonwatcher Administrator

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    Yeah, I've heard a lot of problems changing over to that tube.I personally would probably stick with the 6js6c tube and cap change if the originals were not available.
     
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