Re: Help needed for FT-101EE
Update:
Naturally...right after I posted this thread, I went back in and did some snooping.
Took out relay RL-1 for examination under a microscope and found many of the contacts welded shut and/or very carbonized and dirty.? Upon a very thorough cleaning and burnishing, everything seems back to normal - or at least back to the way it was before.
Mike KD7VRG
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-------- Original message -------- From: mikemm58 <mmcauley@...> Date: 1/4/23 11:59 PM (GMT-07:00) Subject: [Yaesu-FT-101] Help needed for FT-101EE
Hello group, My 101EE has taken ill and I need your help with troubleshooting. I'll try to lay out the events chronologically in order to explain what's going on. * Unit was used primarily on 80m achieving 100 watts out for about a year. No real issues * Unit then sat unused for about six months. * Unit brought back up but with considerably less power out (~20 watts max on 80m and far ??? less on higher bands. * Checked the 12BY7 driver tube on a tester and it showed marginal. * Replaced with another 12BY7 (tube had no markings, but was in a box labeled "12BY7' and ?? it had same form factor as 12BY7. * About 5 seconds after turning heaters on, smoke appeared. Specific location of smoke source was not obvious. * Turned unit off immediately after seeing smoke. (Maybe about two seconds worth of smoke) *? Replacement tube was apparently NOT a 12BY7!! * Upon extensive visual inspection, I cannot see ANY fried, melted, cracked, blackened, ?? or otherwise damaged components or wiring. Everything all *looks* normal. *? Unit still receives perfectly fine, but... *? Will not key the relays when PTT or MOX is activated. Stays in RCV mode. I'm wondering if I can get some help with trying to figure out what got damaged and what I should do to troubleshoot and get this thing back working. Any help appreciated... 73's Mike KD7VRG
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You can view my ratings as a trader on the feedback forum in the classified advertisement section of qth.com. ?-- 73 de Carl N8VZ
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Re: FT-101EE shield for 12BY7?
You're probably right Bruce.?
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Hello group,
My 101EE has taken ill and I need your help with troubleshooting.
I'll try to lay out the events chronologically in order to explain what's going on.
* Unit was used primarily on 80m achieving 100 watts out for about a year. No real issues
* Unit then sat unused for about six months.
* Unit brought back up but with considerably less power out (~20 watts max on 80m and far
??? less on higher bands.
* Checked the 12BY7 driver tube on a tester and it showed marginal.
* Replaced with another 12BY7 (tube had no markings, but was in a box labeled "12BY7' and
?? it had same form factor as 12BY7.
* About 5 seconds after turning heaters on, smoke appeared. Specific location of smoke source was not obvious.
* Turned unit off immediately after seeing smoke. (Maybe about two seconds worth of smoke)
*? Replacement tube was apparently NOT a 12BY7!!
* Upon extensive visual inspection, I cannot see ANY fried, melted, cracked, blackened,
?? or otherwise damaged components or wiring. Everything all *looks* normal.
*? Unit still receives perfectly fine, but...
*? Will not key the relays when PTT or MOX is activated. Stays in RCV mode.
I'm wondering if I can get some help with trying to figure out what got damaged
and what I should do to troubleshoot and get this thing back working.
Any help appreciated...
73's
Mike
KD7VRG
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Did Yaesu ever make a matching antenna tuner for the FT-101 series transceiver?
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Re: FT-101EE shield for 12BY7?
I wonder if the tube shield would just hit the ant loading capacitor shaft. ?
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Re: FT-101EE shield for 12BY7?
Thanks everyone for all your input! I will leave it as is.
Regards...
Mike KD7VRG
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-------- Original message -------- From: Jim Shorney <jimNU0C@...> Date: 12/24/22 6:42 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101EE shield for 12BY7?
To shield the bottom portion of the tube. This was not an uncommon practice. 73 -Jim NU0C On Fri, 23 Dec 2022 22:55:57 -0800 "Tony VA7TF, VE7ACF" <20junk20@...> wrote: > All the FT-101 series I have owned and still own, there was never a shield covering the 12BY7. Unknown why Yaesu used that type of socket. > > ? > > ? > > ? > > Regards, > > Tony > > VA7TF? VE7ACF. > > ? > > From: mikemm58 > Sent: December 23, 2022 9:42 PM > To: [email protected]> Subject: [Yaesu-FT-101] FT-101EE shield for 12BY7? > > ? > > Hello again group, > > On my FT-101EE, I see that the tube socket for the 12BY7 driver tube > is designed for a bayonet type metal shield. Is this factory design? or > did someone in the past modify?? Thinking I better get a shield for it... > > Mike > KD7VRG > > ? > >
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Re: FT-101EE shield for 12BY7?
To shield the bottom portion of the tube. This was not an uncommon practice. 73 -Jim NU0C On Fri, 23 Dec 2022 22:55:57 -0800 "Tony VA7TF, VE7ACF" <20junk20@...> wrote: All the FT-101 series I have owned and still own, there was never a shield covering the 12BY7. Unknown why Yaesu used that type of socket.
?
?
?
Regards,
Tony
VA7TF? VE7ACF.
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From: mikemm58
Sent: December 23, 2022 9:42 PM
To: [email protected]
Subject: [Yaesu-FT-101] FT-101EE shield for 12BY7?
?
Hello again group,
On my FT-101EE, I see that the tube socket for the 12BY7 driver tube
is designed for a bayonet type metal shield. Is this factory design? or
did someone in the past modify?? Thinking I better get a shield for it...
Mike
KD7VRG
?
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Re: FT-101EE shield for 12BY7?
I wouldn't put a shield over the 12BY7 as they run very hot as is. I suspect that the designers found that they got the required amount of shielding required with just the lower part of the tube shielded.
73 Roger VE7LB
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Re: FT-101EE shield for 12BY7?
Hi Mike,
No need to get a shield. ?Both of my FT101s came with a tube base that could take a shield, but neither one came with a shield.?
If you had a shield that would fit in your junk box, I don’t see anything wrong with putting it on, but it isn’t necessary.?
Graham VO1DZA grahamdillabough@... 1 709 770 6977 Skype: graham.dillabough
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On Dec 24, 2022, at 00:42, mikemm58 <mmcauley@...> wrote:
?Hello again group, On my FT-101EE, I see that the tube socket for the 12BY7 driver tube is designed for a bayonet type metal shield. Is this factory design? or did someone in the past modify?? Thinking I better get a shield for it... Mike KD7VRG
<20221223_191207.jpg>
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Re: FT-101EE shield for 12BY7?
All the FT-101 series I have owned and still own, there was never a shield covering the 12BY7. Unknown why Yaesu used that type of socket. ? ? ? Regards, Tony VA7TF? VE7ACF. ?
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From: mikemm58Sent: December 23, 2022 9:42 PM To: [email protected]Subject: [Yaesu-FT-101] FT-101EE shield for 12BY7? ? Hello again group,
On my FT-101EE, I see that the tube socket for the 12BY7 driver tube
is designed for a bayonet type metal shield. Is this factory design? or
did someone in the past modify?? Thinking I better get a shield for it...
Mike
KD7VRG
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FT-101EE shield for 12BY7?
Hello again group,
On my FT-101EE, I see that the tube socket for the 12BY7 driver tube
is designed for a bayonet type metal shield. Is this factory design? or
did someone in the past modify?? Thinking I better get a shield for it...
Mike
KD7VRG
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Re: FT101EE Mystery cut wire
Hi Roger, I dont think it is/was for the speech processor. My EE came pre wired for the user to install an SP if desired. All my SP wires are brought up to where the board would be installed.
Mike
KD7VRG
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Re: FT101EE Mystery cut wire
Hi Mike,
The FT-101EE didn't come with a speech processor. Possibly the wire was left for adding the processor later on.
73 Roger VE7LB
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Inspecting my 101EE, I discovered a wire that apparently at some point got snipped. I cannot see anything that looks like where it was originally supposed to go. It's located under the PB-1092 "TRIMMER B BOARD", and the remnant wire is connected to ground.
On another note, while looking at PB-1092, I see that there is no associated C107 that the schematic shows parallel with TC9. All the other trimmers on PB1092 have their respective fixed value cap.? TC9 is associated with trimming the 15m band.
Any idea what may be going on here?
Thanks...!
Mike
KD7VRG
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Re: FT-101EE voltage measurements
Thanks to all who replied. I think I'll take the readings with both high & low impedance meters and see if there's any noticeable difference.
Again...thanks!
Mike KD7VRG Tucson, AZ
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-------- Original message -------- From: "Peter Fardell G0LQU via groups.io" <peter.j.fardell@...> Date: 12/15/22 5:49 PM (GMT-07:00) Subject: Re: [Yaesu-FT-101] FT-101EE voltage measurements
Those voltages are nominal. Plus or minus 5% is fine. Use any voltmeter. Peter G0LQU Roger VE7LB wrote: > For measuring your transformer voltages all of your meters (VTVMs, > modern DVMs, Simpson 260 etc.) will work fine. The accuracy will be > determined by the calibration accuracy of each meter. Circuit loading > will have no effect. > 73 Roger VE7LB >
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Re: FT-101EE voltage measurements
Those voltages are nominal. Plus or minus 5% is fine. Use any voltmeter.
Peter G0LQU
Roger VE7LB wrote:
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For measuring your transformer voltages all of your meters (VTVMs, modern DVMs, Simpson 260 etc.) will work fine. The accuracy will be determined by the calibration accuracy of each meter. Circuit loading will have no effect.
73 Roger VE7LB
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Re: FT-101EE voltage measurements
For measuring your transformer voltages all of your meters (VTVMs, modern DVMs, Simpson 260 etc.) will work fine. The accuracy will be determined by the calibration accuracy of each meter. Circuit loading will have no effect.
73 Roger VE7LB
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Re: FT-101EE voltage measurements
If you want to use a high impedence digital voltmeter, parrallel the VOM? input probes with a 10k ohm resistor for up to 10 v. 50k for +10 to 50v, 250k for higher voltages. This will? "load" the circuit very close if a 1000r/1 volt sensitivity meter is required.
Regards,
Tony
On Thu., Dec. 15, 2022, 10:08 Bruce Collins, < kb0tj1@...> wrote: Somewhere in the service manual I thought I saw a comment about using vintage impedance voltmeters for everything accept some lightly loaded RF stages, where a high Z vacuum tube volt meter is more appropriate.?
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Re: FT-101EE voltage measurements
To measure the output of a transformer a good dvm will do the job, just remember the off load voltages will be higher than when its connected and under load.
I've just replaced the transformer on an FT101ZD3 the 900v anode feed had bad HV capacitors which caused it to burn out, if you have power problems i would definitely replace all the psu capacitors and any diodes as well, i disconnected all the outputs from the psu boards and made sure all the output voltages were perfect first and then connected the outputs one at a time and checked them as i went, it took a while to find all the bad HV capacitors in the RF power stages before i connected the final 900v section.
i still have a bit of calibration to do but all the supplies are now good.
Theres a good site that gives a lot of info on the 101EE and other models ?
although the page is mostly about conversion to different valves theres lots of highlighted parts that take you to other pages where theres circuits and other information to be had.
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Carl Jón Denbow N8VZ
Andrew
Bruce Collins
Jim Shorney
Tony VA7TF, VE7ACF
