Grundig 3160 tube radio restoration, part 5. More cleaning and IF alignment of the AM.

Cleaning is always on the list of ToDo's, so I get a little done whenever I can. The result is amazing, though, so I always feel good when more and more parts of the radio start to look done.
However, the good bits cannot be ignored. Re-capping and checking the RF stages was on the list as well, so that got done too.
An alignment of the IF for the AM bands gave the set a bit more selectivity, and finally, we get to see the results in a reception test.
Enjoy, and stay safe.
See the full info for this set at:
www.radiomuseu...
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#tuberadios #antiqueradio #radiorestoration
_____________________________________________________________
DIY TEST GEAR: The title says it all:
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RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment:
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[@preiter20]

Meticulous restoration Manuel. When you were talking about cleaning the knobs, I was thinking "I wonder in he put them in the dishwasher" lol. Thanks again for another great video.

[@electronicsoldandnew]

You can actually do that but my wife gives me hell :) If you do, be careful as the screws can get lost.

[@reglard]

Thanks, I am learning so much between you and Mr Carlson's lab, and the first part of learning is knowing how much you don't know.

[@electronicsoldandnew]

Don’t worry. I have begun to know how much I don’t know myself :) Mr Carlson’s lab is great as he has a very methodical way of presenting the subject. My channel is more random and unorganised. My knowledge is also a long way below the level that he is at.

[@geirendre]

This is just really great. Both interesting and entertaining at the same time. This set is turning into a beauty. I normally work on stuff from the 70's and 80's, but your videos makes me want to try something more oldschool. Thanks for sharing.

[@electronicsoldandnew]

My pleasure.

[@EsotericArctos]

It was great to hear this running again. There seems to be a decent amount of sensitivity in the AM bands. You've done a fantastic job making this look almost as good as new again, not to mention working just as good, if not better.

[@electronicsoldandnew]

It is quite sensitive, especially on MW and LW in the evenings.

[@pd1jdw630]

This radio brings back some memories. Looks like one my father had. Good to see this one is getting a good treatment.

[@egilhansen8857]

I have used fishing line for dial cord on several occasions, and with good results. I use the braided variety (Fireline or similar brand). It has very low elasticity and tremendous strength

[@tenareze32]

I recently found your channel which I greatly enjoy, especially as I had a Portuguese South African friend in the Algarve, also an engineer. I was particularly interested in the Counterpoint MOSFET amplifier as I was given one of the first MOSFET (VFET) amplifiers to come on the market, a Sony TA-4650. I made it work for while, but the special Sony transistors were expensive and I gave up and put another power amplifier in the Sony case. I like repairing stuff, but I am not in your division. To pass time at the moment I have been repairing a few old oscilloscopes (1980s), mostly transistorised, but one had a few valves. You can still get NOS valves here in France. Reparing and restoring venerable, quality equipment is satisfying, although it is very time consuming and I don’t have your meticulous patience for restoration. Tiro o chapéu

[@electronicsoldandnew]

I've never tackled scope repairs, but will try one sometime. This hobby is very time-consuming, so efficiency is not an issue. Patience is ... which sometimes is in short supply. I usually love having time at home to do my stuff, but being forced to is another matter. Stay well, and enjoy the hobby. Regards form Madeira.

[@vintageradiosfernandoberna6041]

Great job, You explain very well each detail of restoration. Your english sounds very easy to undesrtand. I wait next video. Thanks for make these videos. Congratulations - Sao Paulo - Brazil

[@electronicsoldandnew]

É um prazer, Fernando.

[@dl7majstefan753]

Great work as usual and stay healthy!

[@electronicsoldandnew]

Thank you Stefan. You too.

[@andybbeck2043]

Great work .looking forward to seeing you doing the case work Too lovely job .

[@electronicsoldandnew]

The case, oh the case! Yep, I’ll have to stop moaning and just get to it.

[@paulbache3940]

great work, makes me determined to start work on my 70s CODA receiver

[@mariocomeq1961]

I had one of these, and the sound was fantastic.

[@electronicsoldandnew]

👍

[@lyntonprescott3412]

Splendid work as usual. Great attention to detail. I made some of your polishing mops for use on The Hallicrafters. Worked very well.

[@electronicsoldandnew]

They do. And they’re incredibly cheap.

[@lyntonprescott3412]

Question from a novice. I have successfully followed your advice on ‘painting’ continuity on the circuit diagram and found it to be very helpful. However what can I do when I come across a capacitor? Is there any way to prove that the circuit continues unbroken? I have seen Shango using audio from his phone?? I have a small audio generator, could I use this (with a speaker) to prove the circuit beyond the capacitor? Lynton

[@sincerelyyours7538]

Very nice! Despite the tedium you sure do nice work cleaning your radios! About using acetone, I've not tried it yet because I don't have a painted chassis ready to try it on, but it occurs to me that plain old nail polish remover might make a good cleaning agent. The stuff I get is mostly a mixture of acetone and IPA. The IPA is there to dilute the acetone which would be too strong on the fingers if used straight. I use it as a toner transfer medium for making one-off circuit boards. These days it is hard to find IPA in the stores but if used carefully on chassis parts only, nail polish remover might make a good substitute.

[@electronicsoldandnew]

Correct. Nail polish remover is in fact a better choice as it is weaker. In fact, if I could weaken it even more I would so that the process is slower and more controlled.

[@DerekHerbst747]

I wasn't expecting to hear BBC 4 coming through on Longwave! I struggle to get it clearly where I am and I'm way closer to the UK. Great job!

[@electronicsoldandnew]

I tried last night and it sounded like it was coming from next door. Must be the open ocean between us. I believe the transmitting tower is on the south coast of England.

[@chairuser4]

fantastic clean up

[@electronicsoldandnew]

Thanks

[@alfredneumann4692]

Very good work with the scale rope. Which input impedance has the antenna input on LW, Shortwave and Middlewave? On UKW , if i remember right, it's 240 Ohms?

[@electronicsoldandnew]

I’m not sure. It varies depending on the frequency band, which makes the IF trap adjustment a little pointless, unfortunately, as the signal was coming from the signal generator with a 50 ohm impedance.

[@alfredneumann4692]

@@electronicsoldandnew I guess, there is a missunderstandig. I don't ask abt the if-trap. That was clear. I only would like to know the input-impedance of the antenna-inputs (on the backside of the radio). And keep yourself and your family save.

[@electronicsoldandnew]

I checked the back. The FM is stated at 240 ohms as you’d said, but there is no indication on the AM antenna.

[@danielsaturnino5715]

That is looking very nice. I have a question if I may. I got an old signal generator , its a C.I.T k24 that I have no clue if it works because it was at a junkyard. Looks as new inside and fairly decent outside. Is an osciloscope the way to go on checking its working operation and calibration? Thank you :)

[@electronicsoldandnew]

It’s a fairly simple circuit, and strictly speaking you don’t need a scope, but it would help. You’ll need to measure exact frequency, so a frequency counter would do. By the way, I didn’t know that they’d made these in Portugal. Nice.

[@danielsaturnino5715]

My father in lawn told me that these were sold as a kit at the time he was taking his electronics technician course. So a frequency counter... I'll figure something out when the time comes. Thanks again :)

[@migsvensurfing6310]

You could also use a radio.

[@jean-pierredesoza2340]

A possible replacement for the thread is nylon for fishing line.

[@electronicsoldandnew]

That might stretch a little too much, don’t you think?

[@jean-pierredesoza2340]

@@electronicsoldandnew It worked for me with a line with specs : 0.4mm / 9.5 kg or 20 lbs.

[@electronicsoldandnew]

Great. Thanks

[@watchyMCFCwatchy]

I've re strung a few sets in the past. Some are a real pain. In fact it has got to be one of the worst forms of torture yet devised by man.

[@electronicsoldandnew]

I agree. Especially when you don't want to dismantle the entire thing just to restring the set.

[@chairuser4]

i use that band aide cloth

[@electronicsoldandnew]

Very useful stuff.

[@lennartbenschop656]

Be very careful not to spill acetone on plastic parts as some plastics (like polystyrene) are easily dissolved in it.

[@electronicsoldandnew]

Yes, that can really spoil your day.