#238 Hammarlund HQ 140 X Repair Part 1

[Music] well hello everyone welcome back to the shop on the bench today we have the Hamelin HQ 140 X communication receiver now this was gifted to me some time ago and just haven't had the time to get around to it I do know there is multiple problems with this receiver and I just wanted to do it with a quick video get started on it find out what's causing it to produce the problems that he had then it has its receivers down doesn't receive that good it supposedly had been recapped and there's a lot of noise in it so I'll turn it on here's some of the noise that's going on hitting let it warm up okay we're picking up on the 40 meter band then I told the camera roll it won't do it but asking that guys a little popping noise in it [Music] [Music] I'm trying to find someone single-sideband activity but there is none this morning I will tell you the we had a storm the other week and most of my dipoles or hanging straight down so uh that's something I got to get out there watching me today is not looking that good either so we probably won't be able to get out there today and do anything to it but it's still you know I've had some other receivers up here this week and it's maybe seem pretty good on it but when you find a single sideband station it's almost next to impossible to tune it in so I said there's some noise and we don't know where the tuning is on this thing so uh knowing that some of the problems of this hasn't at this point we can go ahead and remove the unit from the chassis remove these six screws and don't think there's nothing on the bottom of this and we should then slide this out another thing I'm gonna look at on this chassis is that I while here on this front corner panel is bent a little bit and it seems to be pushed in so we need to see by straightening that out all right guys what bottom side and you know looking at the bottom is very clean in here it looks real nice and we can see already that's two of them what our wax caps have been replaced now the good thing about this rig is that the 140 ex doesn't having a lot of paper caps in it they use these disc capacitors throughout just about the whole rig so you know we've got two caps that had to be replaced there we've come on up you can see that's one down the backside of the speaker Jack and over and just under the audio tube there was a electrolytic here that's been replaced and there's one other wax cap I've already removed the two nuts off the front top side we'll pull that open and yes it's been replaced also so it looks like the onliest capacitors that hasn't been replaced is that three section main quarter cap just under the UH this choke here you can see it down in there this big resistor going to it that has not been replaced I think it's a 10 in to 20s at 450 volts so we'll probably need to get that changed out well guys if this was smellivision you could smell what I'm smelling and no it's not vintage electronics you can see this goldish tent to everything you notice the band spread down it was a real yellow also and you can see it on just about all the Transformers here the fact on the thing you can see what it's like something has run down the front and illness top you can really see it good this top edge here there's nicotine but we got sick and we get ahold of that claim though anyway you see that man killed a cat that's still in here and looking at the it looks original to the unit other than the nicotine it looks real nice on the top side also little rusting around the transformer that's no problem that's normal anyway you'll see that a lot of them just like this thing heated up that nicotine smell got stronger okay so here's a view from the back side you got the correct fuse installed and you know the chassis is in excellent shape it's it's very clean there's some dust on it I don't know why there's no I've seen them at the nicotine on that on the discover or the there's gain capacitors in there but you can definitely see only the backside here just how yellowed everything is just tribal what something here and just see how far this stuff is to go get off you know exactly what they do you cheating you see that corner there just comes just as pretty and clean now some folks claim that nicotine on the electronic equipment can be a good thing if it's not gotten inside of law like well we're resistance and stuff that it actually won't see it coats the metalhead protects it from oxidizing and and changing color so and it looks real good underneath of it but I'm not suggesting go everybody go out for smoking them to cover that equipment and nicotine because steam yes printer so I'll have to disassemble the front faceplate and get back me wash it in some dish detergent some warm water undo some claim there might better clean right on the chassis and not have to remove them I hope so I don't want to get a whole lot of residue running down the meat the bottom here but other than that now be the dial faces and it's pretty much not a whole lot you can't brush it off this there's not a whole lot I can do to those getting there and you try to clean too much you know take the leather and run off of it so we'll have to look at that and see the first thing I want to do is go ahead and off we placed the capacitors from that multi section canyon and we're gonna leave the candy and I've already moved the screws from this chunk we can take it just swing it right out of the way and now we have access to our multi section capacitor notice is a three section capacitor it has four terminals on it but only three active capacitors - other than it's just a a ground and it has like straight to go in there you can see that little better you can see that that one lug right here on the top that doesn't have a designator to it it's just ties directly to ground so taking a quick peek yo schematic you can see right here beside the rectifier tube but there's a 10 microfarad cap here another 20 here and the 20 here and the 10th of that 500 volts the two 20s at 450 I don't think I have a 10 at 500 I don't look but I believe everything I got is a 450 so I might have to put in two 20s and soomi's there just to make up that boenish difference so the point is well I went ahead and took and cut another 20 micro farad after 20 and the red and white is a 10 and just clip the top of the terminals off this capacitor and I left the ground rug but still attached I took a terminal strip and straighten the tab out and what I'm gonna do is solder it directly to that terminal lug this will keep everything low profile then I can run the 3 capacitors out over this way and put one single ground type point on the other side we can get that done okay I got all the caps installed I'm actually tuck down to the bottom of the chassis I'm gonna him put a little hot glue on them got these two grounders on a little tumble strip over here just behind this can and I installed and I ground the 10 Y it up to this tube chassis so I got to do now is I reinstall the choke and that should be all the capacitors that you got worried about this thing you know I can say this is full of these little green ceramic discs and they'll ever prone to leaking you don't have to worry about that that's one good thing about the 140 X now if he gets up to 120 and different models like this all these are gonna be paper caps so then I got the power supply capacitors taking care of non-being start looking for reasons Wilding sensitivity so well long this receiver now the gain control this right up here I love this as soon as I turned that gain control to you know turn the sensitivity down it just about loses all of its receive it's that quick it's like it's you know off and on low to check the part the part is fine it's just that the sensitivity of this receiver is in very bad shape now I don't know where the alignment is I know the dial accuracy is up quite a bit so that tells me that somebody has probably been in here turning and screwing around on things that they shouldn't be messing with but one of the things that a lot of people fail to really look at is like these wafer switches you know you got your I if you're already up in your antenna switching throughout this whole gang here and we getting out here we'll take a close look at this ceramic waste for a switch on the front end and you might just spot some of the problems right to start with unless if I can get you into that when you can see but this sort of contact ring is completely black and there is a lot of tarnish on there so that's going to you know cause more problem with the sensitivity of this receiver it also can be causing something that popping that we're hearing if these little penguins are not making good contact on that certain rain then this signal is not going to get from luck issue it and this writing on I can see dust and little debris all over them so they have got to be cleaned then looking at the front side of it it's not really that bad yeah it's got some Tony showing it but it's not black and what it is this is easy to get to but on the other side of these wafers they are just terrible so I'm gonna go ahead and get in then clean them up a little bit I'm one of the best tools I use it trying to clean these fact and the good thing about this being select switch it just you can continually rotate it you know you know don't have a stop in it it just keeps right on rotating and you can see we're using this pencil eraser and you see just how dirty this thing has got and so what I'm doing is just finding the place where I can get down in there and touch the ring and then rotating it then you see all that black stuff that's coming off in there then we get in then we can wash it out with some cleaner and then go back and use some deoxy d5 on it who didn't look across the banners and say well I lament that I've got the ban spread on 100 and the main tune and I was on point 600 and I'm feeling the signal into it [Music] so it looks like the point 54 to one point three two megahertz banners probably spot on there I'm batting in the band go over to the other end of the bands we've got a win mega hurt and will punish one mega heart into the generator and I'm hearing nothing that's about 1 2002 5 megahertz so that one is all quite a bit on the pain we'll go down to 1.3 ran out to the Logan it'll ban we could about 1.35 megahertz and it's pretty much spot-on back into the band going up to the hiring of the band say three megahertz that's about eight point one one megahertz again the first two veins of sparked on on the low side but off on the hot side that tells a little bit of a story there also we're going to 3.2 to 5.7 go ahead and punch in 3.2 then you see it's off to scale mine is up on 5.6 megahertz and that one's correct you know it's very close on the high side but abated five point seven to ten megahertz but point 70 megahertz he is not even in the valley arrange just take it over to six megahertz that's about by only eight on the low side we'll get on up to ten [Music] it's about 9.95 you can see ten megahertz is just outside the band man look at the sensitivity one with nice about minus 57 DBM eternity baby see y'all you can barely get it that's my leau77 GBM very northern with the ABC oh you'll never hear there it is coming back because that shows us how far down the sensitivity years eighteen megahertz [Music] get out right there just outside of 18 megahertz we'll carry it on over to 30 megahertz and that's very close on my toes you see Bane coverage is just about everywhere yes I closed on some means off on the other ones and then at the same time it's fall off on the bottom the end but you know about right on the the high ends so yeah like I said before it's been a a lot of tuning done on this radio okay so before we can go any further at this point what I need to do is go ahead and remove all the knobs in the two switches take this front faceplate out give it a good cleaning clean up the dials again when you're cleaning these dials you got to be very very careful so you don't wipe the numbering off of them because that planet will come off easily and smothered right in the middle of this glass and it looks like it's on the inside I need to take that apart and clean that and check this meter out and make sure it's all working like it's supposed to and you see it's drifting back down to zero now and once to get the faceplate off and clean design go and start cleaning in the inside of the chassis and trying to clean these yellowish off the insides shouldn't be too hard to do so this is the graph I book this is a selectivity curve in that way you actually look at them with a spectrum analyzer it's this way and this kind of shows you how those curves should really look you see that and then look at this it's nothing like it even when I turn the selectivity switch onto the first notch which would be the widest yeah yes it's nowhere even close so again a lot of screwing has been done through the adjustment points on this radio we didn't remove the four screws holding this cover on and the two lights now we can take a look under the old girls apron see how things are looking under there and here you can see the maintaining gang you know three different capacitors in each compartment so I'll connect to one shaft so that when you tune one it turns the other and this is the band spread tuning game here in the middle we have the antenna trouble that's located just below this s meter and it looks real good in the applet I need to get in here and clean these contacts where the ground tabs off so we make sure we don't have any problem there but other that it looks real good that should better clean up with no problem whatsoever okay - you know kind of know exactly where this receiver sit we already know that the receiver gain is down and we know that the DFO dials or not aligned correctly and we did hear some popping and snapping a little bit at the beginning when we were listening to it so we know that here's some problems but it's kind of what I would like to do at this point is see where the alignment is sitting there and unlike a lot of other receivers like you know this this off receiver operates on 455 kilohertz so instead of taking 15 455 kilohertz into it and peaking out the cause for the maximum gain you have to kind of do this one with a visual method yeah I know some people say that you know and help going in and align these by ear off with a scope and something but to really get it the way it's supposed to be is you you need to do in a visual and and in your manual you'll see these curves here and this is the IEF you see us at the widest point and then as you turn through the crystal selectivity switch you start narrowing it up so forth you know standard am listening it would be in the off position and you can see this one curve right here this nice round peak and comes back down but then as you start engaging the selectivity you start narrowing up this peak and this really helps especially home CW you know trying to pull out signals but we just want to see well this is that because the alignment on this thing takes quite a bit of time and there's a lot of work put into it so here I got the you see these two boxes are connected into the receiver I have the tracking generator clipped onto the body of our six which is a hundred K resistor and that's off coming off of ten seven of v2 and it's not touching the terminals it's just you know clamped around the the body of the resistor and the spectrum analyzer input is clipped on to this capacitor that's coming off a pin to of b7 and again you know it's just clipped you the capacitor and not actually touching deep terminals so we'll turn the tracking keying on we'll put a center frequency of 155 kilohertz and then put it off ten below I can't above and we'll look at that area of the IEF and see what it looks like okay so to look at this we own the broadcast man I had the crystal selectivity tone to all the crystal phasing is on 12 o'clock we're on the arrow doesn't matter what the gain is you can turn it up and down it's completely fine we in the receive position limiters off the main tuning is that very low end of the bands and bands spread is on 100 so we're coming right around here and we'll look at the spectrum analyzer and see exactly what we're getting here so as you can see this signal that's across here it looks nothing like the signal I showed you on the paper just a moment ago which is here you can see just rounded peak at the top here and let's say we are in the opposite position of the crystal selectivity but you can see here we got some kind of humps some situation here that looks like a good signal but well this is not a good signal so when I reach over and turned the crystal selectivity we should see it narrow down you know I see there's a peak here and up a dip on this side so we go to position number two and see it did not a whole lot change position three not a lot changing position forward dropped a little bit position five you see it still caught a little bit so something is way off in this is section again that's all that's on position one now if I rotate the crystal phasing we should better pull up a notch on either side and you can see that notch coming up right here can I go back to 12 o'clock and we'll pull up the other sides but you see nothing happened until I got to about it's like a warren o'clock position but you can see now that notch is back there and we're in the 7 o'clock position that's over on the 10 o'clock position which is only 10 so yeah something is way off I'm go back to the 12 o'clock position and you can see that notch is still there that's back on the off position back on now you can see that notch is gone but we do have a little notch on this side again I've turned to crystal faith just as soon as I touch it and turn it you saw that notch come up and I'm not able to do anything with it yeah it's very erratic it's all over the place it's almost like the phase of control was not working like it's supposed to which tells me looks like there may be a problem inside this side here can I'm not sure yet to really get into it so yeah that's already a problem there now again we you know we said that the the frequency was off on the dials and it had a low gain well these IEF transformers not being aligned correctly or having a problem would definitely affect the gain of this receiver so it looks like we got quite a bit of troubleshooting in this IEF section to find out just what's going on plus a lot of alignment as well and it does take quite a bit of time to sit here and go through the alignment on this receiver so as you see with the up crystal selector all how wide this is I mean it's very wide you know way too wide what it should be it should be a lot now I'll come in here and go to Spain and go to 50 kilohertz nailed it on down that's about how I should look at 20 kilohertz so it's where y'all and you know bear we're still learning this off rygel spectrum analyzers working with these old type of our receivers yeah I'm pretty sure I got everything set correctly but uh yeah I'm still learning some things on this and this is actually going BB first receiver however adjusted using this the particular spectrum analyzer okay well we've got the spectrum analyzer connected back to it just so we can get one last look at the waveform that we're seeing over there on the spectrum analyzer and you can see I have an in the off position right on the court crystal selectivity over to one with the sea off pattern while wave form does not look like it should he's been in the off position you see the wave form is very spread out it's not narrow like it should and I'm trying to show that everything gonna be spectrum analyzer set correctly it's in a frequency 155 resolution badge we have this one killer heart bb-baby 30 Hertz got lost spans 20 kilohertz oops a stop-start looks good but we're just able to see that waveform how it really should look like from what we see in India in the manual returns this way this way form should have more peak here and wish you'd better measure about 60 be down and that's not even it's no ways close then when we select two crystal selective trees one we say our waveforms doesn't look that great and the judge drop down as you see in fact if we put the marker back you mean that's it - 35 that's -41 and as you can see when I go from put stop selectivity 1 to 2 nothing really happens we go to 3 it just moves just a tiny bit that's for it dropped down to minus forty five point two and then when we go to five it does drop quite a bit down - what - fifty three point five of someone that area so something is definitely going on with the IEF change and see I am in manual position so position one I'll rotate crystal phasing we can see it not trying to come up now but it's really not pronounced and we go back to the other side you can see what it not just trying to come up but then it just all goes away one of the problems I do see is that and you've seen earlier once in a while it'll just like it's hung up and turn into phase 2 control don't doesn't do anything so we definitely got something going in in this I have chain off in the phase and control crystal selectivity to sit down and troubleshoot that now they get some other things that if you want to do since I'm in position one I won putting the gang down and go over to be a bug now you said we're pretty much centered there now that's the way form how it should look as you see in the PLO control I turned the CW time we can see that move to either side of sound frequency just like it should and we turned that back in the middle yes that straight up on zero now so that seems to be a problem also just about thinking we have a problem with the babies see also and just since the reason well tell you there okay we want a broadcast band the antenna local Michigan and the WTF News Center hi this is Mike Davis mizura residence and now this is in the manual mode I must switch over to ABC they continue to clean the phones and offices and you see we just about lost all of our volume we're still going to go we got a good signal strength but the volume is totally gone so yeah I think something in the ABC circuit is having a little bit of difficulty also so we're gonna have to troubleshoot that so we got two sections that's just going crazy and first things come to mind voltages perhaps that some voltages in this rig that's that's not right our manual does have a voltage chart for all the tubes so we can pretty much go through that and check the voltages on the tubes see if we can figure out what's going on we're going to check the ABC voltage going to be grids of those other tubes or FM and so forth and see what's going on with that I went ahead and removed the front of this Hamlin hiv-1 40 X and we had started cleaning up stuff now you can see the dials or nice and white now if you remember in the shot of the corner you can see that it was just completely yellowed and all it was I was scared that the hematuria itself had yellowed but it wasn't it was just nothing but nicotine a little warm water some dishwashing soap let's clean them and turn them back nice and white when you're cleaning something like this you've got to be very careful go in the place where you know like on this edge holders numbering years and wash their because this isn't seen in the window and if you see these numbers come off don't go any further find something else sometimes just one water and a cloth will take a lot of it off but these was able to clean up pretty good I got pretty much got the front cleaned and got all the the shafts good and clean and I'm in the process now of putting these dials back on and realigning them and to do that you just set the capacitors full mesh so there's a level across the bottom and then you can push this shaft out there is two gears on the inside that's one G on the back of the shaft mesh with and they got two springs in them and what it is the gears work you know with each other to take the backlash out once you get it back in rotate the dial to the stop you'll see these two lines are pretty much straight up and then rotate them two gears from each other and push the main a little short shaft in the gear back together and that will hold the backlash out so I just wanted to let you see this before I put the faceplate back on I'm gonna say is it's cleaned up rather nice so well that part is looking good now so in point two of this we'll sit here and we'll go through the schematic and also go through the boldest chart no like I said we got voltages for the tubes the schematic itself has no voltages on it it doesn't even tell us what the voltage coming out of the power supply was off we know the rated voltage of the caps but we don't know the rated voltage of the power supply until we sat down and study it pretty good so maybe by going through this and going through this voters chart we can start checking some voltages and see just what is causing these two issues I wanted to go ahead and get it cleaned up by taking the panel and stuff off and had to take the dials off get all that cleaned up and put that together before we started any type of troubleshooting because once we start twelve of shooting we don't want to be taking things back apart that would just cause more headache for us you guys that's gonna be here for this part always there quite a bit of time in this don't want to make these videos too awful long before you think people just don't have the time to sit down look at a long video at one time but you know we'll break this up in and steps and woke up to it so uh maybe the next time we can get on in here and do some troubleshooting and find out just what's going on anyway you don't mind hit the like button haven't subscribed please do so and you can also check us out over on patreon so until the ends that we'll see in the next video bye now

Channel: The Radio Shop

Views: 7,283

Keywords: Hammarlund HQ-140-X, restore, restoration, tube, resistor, capacitor, vfo, bias, voltage, modulator, current, modulation, tune, align, circuit, ham radio, cb, boatanchor, meter, theradioshop, the radio shop, crystal, oscillator, electronics, tubes, transistor, troubleshoot, solder, vtvm, audio, switch, control, Hallicraters, Multi Elmac AF-67, power supply, plate, transformer, bands, alignment, repair, solid state, voice cw, morse code, diagram, schematic, reverse engineer

Id: SctQFfgKPqM

Length: 47min 40sec (2860 seconds)

Published: Sun May 31 2020