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Post by Tombstone (R.I.P.) on Aug 30, 2008 7:56:47 GMT -5
That might work as long as the .01 uf cap isn't an electrolytic??
Tombstone
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Post by Deleted on Aug 30, 2008 8:39:02 GMT -5
I think most electrolytic are high value, like 1 uf and up. I have some ceramic discs lying around. I verified this 4-5 times. I like to make sure before I post. So I don't look like a horse's ass !
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Post by Tombstone (R.I.P.) on Aug 30, 2008 13:53:48 GMT -5
I tend to kludge up posts myself, like maybe this one. If you're putting in another disc capacitor of that .01 value it should be ok. I think that disk caps are fairly forgiving, could be wrong. Just be ready to yank the power cord out of the outlet just in case something smokes.
Tombstone
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Post by Deleted on Aug 30, 2008 15:06:44 GMT -5
It wasn't the problem. It attenuated the signal, but if I put a hi enough signal thru, it would come out, just lower in amplitude. I verified it with a simliar cap. I figured these things never go bad. Just has me scracting my head more.
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Post by Tombstone (R.I.P.) on Aug 31, 2008 9:52:59 GMT -5
It's a dilemma allright, you'll have to go with the signal generator.
Tombstone
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Post by SIX-SHOOTER on Mar 26, 2018 18:18:07 GMT -5
I own the Model T,GTX-5000,T-123B,& T-240D & each of them either has this issue or has had this issue with receive.The GTX-5000 also has it on transmit sometimes & the T-123B & T-240D both have the squelch issue.I am taking the T-240D to a friends shop this week so he may give it a complete going thru.It is a MINT radio & I want it 100% operational.I will get them all checked one at a time that still have any issues but the 240D is my 1st priority then the GTX-5000.
SIX-SHOOTER
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Post by Deleted on Mar 26, 2018 22:05:49 GMT -5
Why is this thread re-opened? LOL
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Sandbagger
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Post by Sandbagger on Mar 27, 2018 18:42:53 GMT -5
Why is this thread re-opened? LOL Talk about moldy...... This thread is 10 years old now...... |
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Post by SIX-SHOOTER on Mar 28, 2018 11:32:30 GMT -5
Why is this thread re-opened? LOL Maybe because I just purchased a MINT (In appearance) ROBYN T-240D & it has the same issue? I own several of the other models as well that are the same radio under a different brand name & each has some small issue with them as well.I am sharing my experience with them & I'm sure there are plenty of others in the group who own one or more of these radios & they may or may not be experiencing some of these issues as well & some of those members may not have been a member when this thread was started years ago.The group is for sharing info & that's what I am doing.What do you use the group for if not sharing information & experiences with radios that you own or have owned in the past?  SIX-SHOOTER |
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Post by 2600 on Mar 28, 2018 12:59:49 GMT -5
The "same issue"?
As in weak receiver sensitivity?
Sure that's one issue. Like "my car runs rough when it gets past 30 miles per hour". Could be a clogged fuel filter, dirty carburetor, bad plug wires, weak ignition coil, burned valves, etc, etc. One issue, multiple possible causes.
More than one possible cause of the receiver problem.
Those radios were built by Panasonic, aka National Electronics, aka Matsushita. Multiple name brands and models were based on the same series of chassis designs.
Biggest headache for us was the hard enamel paint they would dribble down the inside of the coil forms in the IF/RF 'can' transformers and coils. This served to lock the tuning slugs in place for the trip across the Pacific ocean. But you can't adjust them to compensate for age or when a tube connected to that coil gets changed. More than once, aligning this kind of radio would cure the sensitivity problem all by itself.
But only after you got the tuning slugs to turn. It's a nerve-wracking and laborious process to dribble toluene into the coil form, and get the slug to turn without cracking it. Once it cracks, the tuning tool causes the broken halves of the slug to press outwards against the inside of the coil form and lock it in place. Like the centrifugal clutch on a go-kart. If you overdo the solvent, it dissolves the glue holding the plastic coil form in place. Turning the tool makes the coil form itself start to turn inside the can, ripping the windings' tiny frog-hair wires away from the terminal lugs inside the can.
Most common thing we see is that the slugs are already cracked. Someone will insert a metal hex key into the slug and twist it until the slug cracks, and then the damage is done.
These were great little radios 40 years ago. They were popular for good reasons. But they ran hot and aged quickly. I don't discourage anyone from taking on a repair, but the routine challenges of this radio are still part of the picture.
A tube tester may be helpful. Only takes one weak tube to knock back the receiver performance.
73
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Sandbagger
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Post by Sandbagger on Mar 28, 2018 15:52:02 GMT -5
Why is this thread re-opened? LOL Maybe because I just purchased a MINT (In appearance) ROBYN T-240D & it has the same issue? I own several of the other models as well that are the same radio under a different brand name & each has some small issue with them as well.I am sharing my experience with them & I'm sure there are plenty of others in the group who own one or more of these radios & they may or may not be experiencing some of these issues as well & some of those members may not have been a member when this thread was started years ago.The group is for sharing info & that's what I am doing.What do you use the group for if not sharing information & experiences with radios that you own or have owned in the past? SIX-SHOOTER That's a good point, and it's the reason 10 year old threads are still here, rather than being purged due to age. There is lots of good information in these pages. One need only look. |
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Post by SIX-SHOOTER on Mar 29, 2018 22:06:03 GMT -5
Maybe because I just purchased a MINT (In appearance) ROBYN T-240D & it has the same issue? I own several of the other models as well that are the same radio under a different brand name & each has some small issue with them as well.I am sharing my experience with them & I'm sure there are plenty of others in the group who own one or more of these radios & they may or may not be experiencing some of these issues as well & some of those members may not have been a member when this thread was started years ago.The group is for sharing info & that's what I am doing.What do you use the group for if not sharing information & experiences with radios that you own or have owned in the past? SIX-SHOOTER That's a good point, and it's the reason 10 year old threads are still here, rather than being purged due to age. There is lots of good information in these pages. One need only look. I did not own any of the radios I own now 10 years ago that I can recall.I use the information that I can find here & on other groups so I don't need too ask a bunch of questions that have already been answered dozens of times somewhere on the world wide web.Google is your friend if you just remember that everything people posts is NOT a fact.Such as one post I read about the T-240D on another site where the person stated that the Range Boost switch was for the receiver when in fact is is on the transmitter section.Don't know what he was smoking but it's much better giving no information than the wrong information in most cases.God bless. SIX-SHOOTER |
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Sandbagger
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Post by Sandbagger on Mar 30, 2018 17:16:00 GMT -5
That's a good point, and it's the reason 10 year old threads are still here, rather than being purged due to age. There is lots of good information in these pages. One need only look. I did not own any of the radios I own now 10 years ago that I can recall.I use the information that I can find here & on other groups so I don't need too ask a bunch of questions that have already been answered dozens of times somewhere on the world wide web.Google is your friend if you just remember that everything people posts is NOT a fact.Such as one post I read about the T-240D on another site where the person stated that the Range Boost switch was for the receiver when in fact is is on the transmitter section.Don't know what he was smoking but it's much better giving no information than the wrong information in most cases.God bless. SIX-SHOOTER That's almost as bad as the people who thought that "input power" was a receiver rating back in the day. Not sure how they would figure that, but they did. |
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