How to repair EF Johnson Viking Valiant transmitter VFO Drift 18K Resistor
ฝัง
- เผยแพร่เมื่อ 18 ต.ค. 2024
- More cool Johnson repairs by D-lab electronics. This resistor in the VFO compartment is a real troublemaker and tough to replace due to its location. I have changed many of them over the years. You need patience and a steady hand for the task. This is a highly recommended procedure. Many classic Johnson transmitters have suffered damage due to the neglect of this impending doom. If you do not feel comfortable performing this repair, contact D-lab.
I wish my wife could bring a beer when I'm on duty at the firestation?
It's always pleasant seeing Marcia in the videos,even though it was not planned! Another great repair by D-Lab.
No wonder you didn't get pulled over by the Hallway Patrol, I counted about 3 glasses of wine , isn't it great to have this much fun at home !! You had me cracking up Terry ,good video.Peace.
Excellent presentation.
My dad is from Waseca, MN and his best friend in high school was a ham. He'd get a new rig from Johnson and test it out for them, and give them feedback. He'd get to keep the rig after testing.
I have an indirect connection (via my dad's friend), but still feel a connection to these things. Love them.
This is Radio Proctology at its finest! Lol. Weller to the rescue! Seriously, such an important repair to be done on these things. Great job!
Terry thanks for these great videos! I’m picking up a valiant of my own very soon which should go great with my Viking ranger 2 and r390a. These videos will come in handy for sure. Hopefully I’ll catch you on the air soon. 73 de W8NAP
Terry you are the best Tech on youtube hands down.
Great vid Terry last time, about a year ago, you put it underneath the chassis to keep it cooler. And remove as much heat out of the Vfo.
That was the Johnson Navigator repair. Actually that resistor was already mounted in that position. I normally keep it in the VFO compartment. Updating to the 5watt resistor lowers the operating temp.
You like wine and she Likes beer it makes her a jolly
Good fellow.
Reminds me of an old song from Tom
T Hall. Nice Job on the old radios.
I was thinking that a "see snake" digital inspection camera like a furnace tech/auto mechanic can get would do the trick.. I had a furnace inspected with one, and I never forgot how cool that would be to have that in my tool collection. Nowadays, there's a budget version for sale online or at a harbor freight store.
Hey Marsha !!! Nice to meet you, you are an awesome partner for Terry... nice job. !! Cool camera and glad it passed the sniff test.. LOL To get those pigtails clean I think you could have used some 90% alcohol and an acid brush but the exact deal works well too. Thanks for explaining this one... very good to know... Thanks my FRIENDS !!
Hello Ron, Marcia says HI!
Another great video Terry. I appreciate you doing videos on these old rigs. You are the professional!.
Thank you for a very informative review of replacement resistor in this VFO Sir.
Thank you for sharing such useful information also presented with a unique sense of humor! I really like that and I enjoyed every second.
Thanks Reb, I try to keep it clean & fun
You have some great videos learning a lot I have a viking also the 5 V 4 gets hot. I changed 2 Cap's that go to the socket of the five V4 did not solve the problem
Mission Impossible!!! Congratulations Terry from Spain. José Luís ea5bii
Love your videos too....
Inspiring me to build something....
I never have ..but have wired many guitars and I know this is a big jump from that......Question.....can u do a video on how to wire up an eye tube? To reflect the guitar signal??
Say a 6e5 I have an old Curtis Mathes that I checked for continuity was interested in using it ...
Thanks
I also have an old sears police scanner..like the with the punch cards for frequencies....was thinking of hitting and using the chassis for my first build .would be cool to incorporate the 6E5 onto the front panel
Wine makes everything smooth and stable!
I just couldn't 'resit' the opportunity to look into the 'access hole'...LOL
If you take the new resistor and super glue it to the aluminum of the box to increase the heat dissipation of the resistor it improves it operation. It works great and can be removed later if needed.
Nice job Terry!
I have a ranger that needs a look and just bought a valiant yesterday. Scared to death to ship them, but may consider freight. What is a good way to contact you?
Hello, I am in Battle Creek, MI e-mail is: n6tlu@comcast.net
Ok I've given in and subscribed. Boat anchors !! arggh!! Too interesting though to ignore.
Something stinks about all this!!...LOL Nice job, great humour!
Since it's normally covered by the side plate, would there be any harm in using a Dremmel tool and cutting an larger opening on the side nearest the front to open things up for general maintenance?
I was wondering on what type of solder you use
Typucally I would use 60 40 tin/lead, that is a three state solder
I now use 63 37 a eutectic 2 state solder.
60 40 can give you cold solder joints if the wire is moved befor the solder goes solid
63 37 goes from luquid to solid, boom, no cold solder joints.
What is you thpughts???
nicely done
Have you might have ever found a a spray paint similar to a Johnson Viking Valiant transmitter case cover color? Please share with us if you have found it? I think of it as a purple/black-
Chuck W9KR
Hi I was wondering if you could give me some info on a johnson viking 4740 radio , I'm trying to find a good side band mic for it
Hi Terry... since you work on these old school radios, I figured I'd ask you... I have a Shure 707a style mic that needs a crystal/ceramic element. I'm not picky on having an exact element, just a high impedance one with strong output. Do you have a source? or are you a source?
Hey man, sorry not something I'm into
Ok, I figured somebody you knew might have some info. Can't blame me for trying.
You can get little inspection cameras like that (hook to your phone) for under $20 from China. Go to Ali or Banggood, and look up USB endoscope.
Terry,Marcia what's a keyster????.. Rob. From England.
Same as a Bum
I once asked my dentist what he did with his dental tools when they wore out. He said he has a pile of them he no longer uses. I asked if might have one for my electronics hobby. He pulled out a bundle and asked which one I wanted, then just handed them all to me. Never hurts to ask the doctor!
first exellent vid terry!! :-)
Wine assistant!
Now change all of those old paper caps before applying power.
Funny, I have overhauled and used a half dozen valiants over the last 30 years, and never once felt the need to mess around with this resistor. I think this is one of the great old wives tales or myths of ham radio. It is necessary to warm up these radios thoroughly, which takes a half hour or more.. but after that.. whats the problem ? Sadly, there is one guy prominent on ebay, who subjects rangers to a huge raft of ill-advised and unnecessary mods.. he calls "upgrades". these old radios have plenty of problems that all most all go away, after you shot gun the old paper and electrolytics, clean the rig thoroughly , with real attention to the switches and tube sockets, finding any wildly out of value resistors, and giving the thing a set of really decent new tubes. Then any real problems will surface and cant hide or masquerade. I see stuff like shorts and arcs in wiring harnesses, and other arc related problems. But the basic design was sound.. and seldom does it need "fixing".
Asking as a non-native speaker...Why is it called "trinoble-resistor"?
chernobyl-restistor...got it
You need to give that wine delivery unit a break...
I remove the resistor and OA2 using a zener and mounting the resistor to the lower chassis reducing HEAT! My drift is 30% of what it was before the changes shown in my utube : th-cam.com/video/z3FRLLt25Jk/w-d-xo.html . The rig looks and works fine now, drifty vfos are a pain in the butt. Enjoy W 😀 😅 D Y
IF IT AINT BROKE... DON'T FIX IT...
My typing is terrible
Mee too. a 1 finger plucker!!
I love your videos. I watch some others doing repairs but yours are so informative and have a such a winning formula that I watch them 4 or 5 times.
Terry Mohawk or apache fix