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Rs: need help fixing a Yeasu ft-101-es

 

Hi All. Re: I reasnly got a partly working Yeasu FT-101-ES. I got it asis from a pawn shop. The Pawn shop got the 101 in an estate sale. The 101 came Complete expect for no A/C or DC power cord. I got an A/C power cord from eBay. The A/C
cord arrived about a week ago. the 101 powers up BUT there is very little
sound, just a tinny bit of static and when I turn on my FT-890 HF rig (It works great) to 3.980mhz and turned the antenna switch to the
FT-101-ES and turned the mod on the 101 to tune and moved the ptt
switch to MOX I got a very loud tone out of the transmit on the 101 and about 30 watts power reading on my MFJ-941E tuner with the 101 preselect, plate and load tuned right. I can hear my own voice on the FT-890 when I speak in the mic on the 101. All 3 tube filaments light up. So that tells me that the TX is working up to the
driver tube and probably the finals are putting some power out.? It also tells me that the 3 ganged tuned IF cans haven't been messed with (thank God for that). It has been many years since I last worked on any FT-101 anything. I am going to need some guidance on fixing this rig. All I have for test gear is an old Echo tube driven RF GEN and a Ideal 61-340 digital VOM. I sold my portable tube checker a few years back.
BTW When I tried to TX on the FT-890 I heard NOTHING on the FT-101-ES
?
?
?
Steve,??kc7byp@...
From the desk of the Amateur radio station of?KC7BYP
1/24/2024
 

Hi Steve,

I have the FT-101E but have never heard of the ES.? I checked online to see if any schematics were available but did not locate one.? I did find out the below information about it.? Maybe that's why I'm not finding any documentation on it.? It looks to have been manufactured in the late 70's.? Since you have three tubes your transceiver must have been modified for more power output.? I assume that the input power was changed from 100VAC to the US 120VAC requirement.? Using your VOM you could measure the supply voltages.? A schematic from another model might help verifying if your unit is close to that to determine voltages.? The unit is old enough that you may have high ESR, leaking capacitors throughout.? That should be an easy check to measure some of the smaller caps with an ESR meter and you can do it in circuit as long as the caps have been discharged before measuring.? You mentioned working on these units before, so you probably know all this.? I'm not an expert but plan on powering up my 101E but using a dim bulb tester I need to build.? I bought my Yaesu it the late 70's and would hate to see any smoke as most parts are obsolete.??

Good luck and let us know how it goes.

  • The?FT-101ES?was a special FT-101E model for the Japanese market only with a single 6JS6C tube and 50-watt output.

Dan
--
73, KK7JNR
 

best i can do.


On Fri, Jan 26, 2024 at 2:27?AM Steven Eizenberg <kc7byp@...> wrote:
Hi All. Re: I reasnly got a partly working Yeasu FT-101-ES. I got it asis from a pawn shop. The Pawn shop got the 101 in an estate sale. The 101 came Complete expect for no A/C or DC power cord. I got an A/C power cord from eBay. The A/C
cord arrived about a week ago. the 101 powers up BUT there is very little
sound, just a tinny bit of static and when I turn on my FT-890 HF rig (It works great) to 3.980mhz and turned the antenna switch to the
FT-101-ES and turned the mod on the 101 to tune and moved the ptt
switch to MOX I got a very loud tone out of the transmit on the 101 and about 30 watts power reading on my MFJ-941E tuner with the 101 preselect, plate and load tuned right. I can hear my own voice on the FT-890 when I speak in the mic on the 101. All 3 tube filaments light up. So that tells me that the TX is working up to the
driver tube and probably the finals are putting some power out.? It also tells me that the 3 ganged tuned IF cans haven't been messed with (thank God for that). It has been many years since I last worked on any FT-101 anything. I am going to need some guidance on fixing this rig. All I have for test gear is an old Echo tube driven RF GEN and a Ideal 61-340 digital VOM. I sold my portable tube checker a few years back.
BTW When I tried to TX on the FT-890 I heard NOTHING on the FT-101-ES
?
?
?
Steve,??kc7byp@...
From the desk of the Amateur radio station of?KC7BYP
1/24/2024

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