[Yaesu] Re: Part for FT-100

Wed Dec 7 13:54:40 EST 2005

Yes, it's the same V/U power amp part for the D & non-D model.
One alternative is to remove the device, jumper the driver stage to 
the output filter section & use (an) external amplifier(s). This is 
inconvenient at least, but still makes use of the V/U portions of the 
rig. Of course, under computer control the 100/100D would make a fine 
scanning receiver for the base station/shack; perhaps useful for 
contesting in that role.
At 12:23 PM 12/7/2005, you wrote:
>Gregory,
>The service manual that I have is for the FT-100/FT-100D and both 
>radios have the same transistor. I called Yaesu service today and 
>asked if they had any suggestions as to who may have the transistor 
>and they suggested RF Parts(this company was recommended by another 
>reflector reader as well). A quick call to them revealed that they 
>do not have it. If yours is still working 100% then now might be the 
>time to unload it while they are still bringing good money.
>Paul, N5PS
>P.S. I also checked with AES and Burghardt's service department and 
>they don't have any. They are both at a loss as to what to do about it too.
>>Gregory Andracke wrote:
>>>i've been reading the mail on this and wonder if it
>>also applies to the FT100D?
>>>>--- "Paul S. Serio" <pss at tecinfo.com> wrote:
>>>>>>>>>Bob,
>>>Poor choice of words on my part. What I should have
>>>said was that Yaesu
>>>had no more of the transistors and would not be
>>>getting any more. I had
>>>not realized that the MRF166W was a 28 volt device
>>>but I did verify that
>>>with a quick look at the spec sheet. Also the SK701,
>>>SK702 and BLF546,
>>>BLF548 are too. I could not find the BLF549 listed
>>>on Phillips site so it
>>>too may be discontinued. In light of this info I
>>>think that I will just
>>>list the radio on eBay as a "tech special". One
>>>might could get decent
>>>power out of the BLF548 at 13.8 volts since at 28
>>>volts it is rated at 160
>>>watts out but then again you may not. I can't see
>>>how the FT-100 series is
>>>still bringing fairly decent money on the used
>>>market with this bad news
>>>hanging over its head. I guess in the future the rig
>>>will be referred to
>>>as a HF/6 meter rig with VHF/UHF receive capability.
>>>Looked at in that
>>>light the used price will probably settle somewhere
>>>around 350ドル to 400ドル
>>>where the Alinco DX-70s are now. Oh well. Live and
>>>learn. I was told as a
>>>young man that those lessons learned the hard way
>>>were the ones best
>>>learned. 73
>>>Paul, N5PS
>>>>>>>>>>>>>YAESU discontinued the RADIO, not the part!
>>>>>>>YAESU had to stop
>>>>>>>>>>production
>>>>of the FT-100 because MOTOROLA stopped making the
>>>transistor! (It was
>>>>>>>>>>NOT
>>>>Yaesu's desire that things happened this way, and
>>>>>>>there is NO equal
>>>>>>>>>>replacement
>>>>for the part.) The closest alternate parts are
>>>>>>>intended for 24 to 28 volt
>>>>>>>>>>operation, and will give only 15 to 20 watts
>>>>>>>after careful circuit
>>>>>>>>>>modifications, on 13.8 volts. POLYFET transistor
>>>company has said they
>>>>>>>>>>are working on a
>>>>similar device for 12 to 14 volt operation, but I
>>>>>>>have yet to see or
>>>>>>>>>>obtain
>>>>one.
>>>> I believe the original device was made
>>>>>>>ESPECIALLY FOR the FT-100, by
>>>>>>>>>>MOTOROLA, and sold ONLY to YAESU, so it is VERY
>>>>>>>UNLIKELY that you will
>>>>>>>>>>find a
>>>>substitute with EQUAL performance, unless POLYFET
>>>>>>>or another manufacturer
>>>>>>>>>>decides
>>>>to create a similar device.
>>>> Sorry for the BAD news.------------73, and Happy
>>>>>>>Holidays!-Bob Curry,
>>>>>>>>>>KC3VO
>>>>>>>>>>>>----------------------------------------------------------------------------------------
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Thanks,
Robin Midgett K4IDC
615-322-5836 office - rolls to pager
615-835-7699 pager
615-301-1642 home
K4IDC at comcast.net
robin.midgett at vanderbilt.edu
http://www.people.vanderbilt.edu/~robin.midgett/index.htm