The 'Why and How' of an RF alignment - Tube Radio Restoration Back to Basics part 12

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Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ ➠ ➠ ➠ Doing an RF alignment on a tube radio is actually quite a simple process, provided you have detailed alignment instructions for that particular set. If you don't, it can get messy. The solution is to understand why you're doing what you're doing, as this takes the guessing out of the procedure. A little learning can go a long way to saving you lots of time and frustration in the future, so here we go ...
Enjoy the video.
🎥 Other videos in this series:
■ Back to Basics 1 - Tube Radio Anatomy: • The Parts That Make Up...
■ Back to Basics 2 - Tube Radio Anatomy: • Checking the Power Sup...
■ Back to Basics 3 - Follow the B+: • How to Check the B+ Sa...
■ Back to Basics 4 - Testing the power output: • How To Check the Power...
■ Back to Basics 5 - How to safely test the output tube: • How to safely test the...
■ Back to Basics 6 - Preamp, Tone Shaping and of lots of detail: • Preamp, Tone Shaping a...
■ Back to Basics 7 - What do those tone presets really look like?: • What do those Tone Pre...
■ Back to Basics 8 - We've got LW and SW, but where is the MW?: • We've got LW and SW, b...
■ Back to Basics 9 - Do we have FM, and how does it work?: • Do we have FM, and how...
■ Back to Basics 10 - The all-important IF alignment of the AM.: • The all-important IF a...
■ Back to Basics 11 - How tough can the FM IF alignment be?: • How tough can the FM I...
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5 июл 2024

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Комментарии : 43

@DavidSmith-zx7wz 24 дня назад

You are really getting good at this theory stuff with your software, taking apart the schematic the way you are doing!! Really great stuff. Thanks again.

@electronicsoldandnew 24 дня назад

Pleasure

@jameslester3861 Месяц назад

I studied electronics and Radio-Television repair in trade school from 1977-1980 and IF/RF alignments were always a favorite of mine. My career centered on audio-visual equipment repair for a large school system and never touched a radio receiver during that time. I am retired now but still have my generators and meters. watching videos like these bring back some good memories. Vacuum tube equipment was just about obsolete in use when I started school but the curriculum had a thorough course of it with hands on training before teaching transistor theory.

@electronicsoldandnew Месяц назад

These “old” technologies are fascinating to me, because when I was at university the tube era was over. Fortunately, the internet has made all the info available.

@BobAndersson Месяц назад

Thanks Manuel. That simplified schematic really helped to make it obvious why the trimmer cap has more effect at the high frequency end of the dial. I confess I was looking at your replacement dial glass with some envy as I have a Nordmende Othello in the queue with a dial glass in three pieces. 😢

@electronicsoldandnew Месяц назад

😊 I was lucky that someone out there had one to offer. It was a gift and I really appreciate it

@user-kv7jj6gt4f Месяц назад

Greetings from Germany... EO&N was my inspiration for building my 1:1 Isolation Transformer that incorporated the similar Dim Bulb tester as EO&N. Some where along the way I learned the 'Rule of Thumb' keep one hand behind your back or in your pocket for your own protection. Mean while my 'Go To' RU-vid channel has been my main channel for vintage German Tube Radio Repair & Restorations Tips and Tricks. Paralleling EO&N is Mr. Carlson's Lab.

@electronicsoldandnew Месяц назад

Thanks for the kind words.

@petersdelucaaa2vg306 Месяц назад

Having read a number of RF alignment instructions, I can’t recall any of them asking me to be sure the pointer is correctly placed on the dial string as you explained. I’m guilty of “not seeing the forest through the trees”. As it turns out my blaupunkt just needs a pointer adjustment…. Thanks for having us see the big picture first. Great video.

@electronicsoldandnew Месяц назад

👍

@raymondmenard5444 Месяц назад

My God this is a good series, well put together Manuel, i watched it in 1 1/2 day, thank you for sharing. I knew some of the hows, but very little about the whys i admit. I feel i'll be better prepared for my next repair project which is a Telefunken 5116 WK, console with pick up. Should get it on the bench any time now, owner says it's completely dead. I repaired a Grundig 2220 CA last winter and it went well and gave me enough confidence to tackle the big console. I just love the German radios :-)

@electronicsoldandnew Месяц назад

Happy to know it’s proving interesting. Good luck with the Telefunken.

@raymondmenard5444 Месяц назад

@@electronicsoldandnew Oh yeah it's downright fascinating to me, sometimes i can't believe i brought radios back to life all by myself , this new hobby is making retirement so much more enjoyable thank's to guys like you and David Tipton namely. David has helped me so much already, i'm forever grateful. Without good and generous people like you guys this would be a dying art. Hard to believe you can't get formal training in this field anymore, at least not in my neck of the woods. Luckily we have the internet and You Tube. Thank you again and be well Manuel.

@electronicsoldandnew Месяц назад

Thank you 👍

@lyntonprescott3412 Месяц назад

My R.A.E. instructor always said "One over 2 Pi root LC gives you the resonant frequency! Still remember that even after over forty years! This series is so fascinating and and totaly compelling. I have been a radio ham for many years but I am still learning new things due to your excellent instructional videos. My interest was amateur radio, maing new contacts, building aerials, power supplies, RTTY terminals, even shared computer programs via VHF radio. I wish I had got into valve radio restoration many years ago. Seen so many sets sent to their destruction before my eyes! Thank you for the experience. Lynton G4XCQ 😁 P.S. How many of those radio stations on the dial still exist???

@electronicsoldandnew Месяц назад

I am always extremely pleased to hear that my videos are proving interesting and instructive. I’m humbled by the vast accumulated experience represented by the regular viewers of this channel, and thank you, Lynton, for your continued participation in this journey. As for the number of stations still around, I really don’t know, but unfortunately they’re being reduced month to month.

@techobaz55 Месяц назад

Just brilliant Manuel, Thank You !

@electronicsoldandnew Месяц назад

My pleasure

@danielsaturnino5715 Месяц назад

I need 101.9 😊 looking forward to the next video!

@electronicsoldandnew Месяц назад

That will probably be reachable. I normally extend it to about 102MHz.

@JonRig Месяц назад

Another excellent video!! Great series. Thanks again for sharing your knowledge and learnings in this in-depth way.

@electronicsoldandnew Месяц назад

👍

@mackfisher4487 Месяц назад

Manuel you Got Me, at 3:28 You mentioned "Drahtfunk" I'm still searching for some documentation, I'm speculating that they were using an early form of subcarriers like the phone companies using in the 20s on 4-wire circuits. I'm hoping some viewing will have some knowledge of the subject and help put rest to my curiosity.

@electronicsoldandnew Месяц назад

Here’s a link to one description: en.wikipedia.org/wiki/Carrier_current

@josephmagedanz4070 Месяц назад

Thanks again for another wonderfully informative video...great information!

@electronicsoldandnew Месяц назад

Pleasure

@lennartbenschop656 Месяц назад

This Drahtfunk thing was specific to Switzerland. Many locations in valleys had poor or no radio reception and they transported the signals over the phone lines on longwave frequencies. Later there was a very dense network of FM transmitters, which will soon be replaced by DAB+. Switzerland will then be the second country after Norway with no analog radio stations (your country Portugal is the one of the few EU countries with no DAB digital radio at all).

@electronicsoldandnew Месяц назад

Yes, progress … it’ll be a shame when these radios become completely silent.

@bofor3948 Месяц назад

Yes the Uk was supposed to switch to DAB a few years ago. Not DAB+. DAB has too low a bit rate resulting in a very flat sounding reproduction. It has coloured peoples view of the medium and generally here has been a poor uptake. The difference between Std digital TV and UHD TV is a good comparison, except of course it is audio. The powers that be want the change to squeeze the radio stations into a tighter band freeing up spectrum for other uses. Mobile phones with more bandwidth to expand their versatility. For me there are too many buttons on a phone now so I hope the AM and FM radio stations stay around a lot longer. Lost too many. That drahtfunk thing sounds similar to the WB900 unit (allowed two subs to use one pair privately, replacing party line switching, where you could hear the other user). Also WB1400 units used by BT in the 80's and 90's to put a number of subscribers on one pair of wires. They both allowed switching signals and the audio to be carried on different frequencies increasing line usage and privacy.

@electronicsoldandnew Месяц назад

👍

@tubeDude48 Месяц назад

👍 Well done, again!

@electronicsoldandnew Месяц назад

👍 😊

@psionl0 Месяц назад

One thing you could have added to the theory is why we adjust the inductance at the LF end of the band and the trimmer capacitors at the HF end of the band. It turns out that at the LF end of the band where the tuning capacitor is at a maximum, adjusting the trimmer capacitors has little effect on the total capacitance and thus resonant frequency. Therefore, only adjusting the inductance will change the resonant frequency. This leaves the trimmer capacitors to be adjusted at the high frequency end of the band where they will have a considerable effect on the total capacitance and thus resonant frequency.

@electronicsoldandnew Месяц назад

👍

@Forensic1Man 27 дней назад

Manuel, Wonderful, Wonderful, Wonderful! One can learn so much from your videos. They are great. Is it possible for us to get the .STL files so we can print the AM antenna loop?

@electronicsoldandnew 26 дней назад

Sure. Email me and I’ll send via email.

@renowden2010 Месяц назад

AT 33:50 after you had aligned MW and were describing what you had done, the meter was going all over the place. Either your hand moving around was affecting it or there was something affecting the signal.

@electronicsoldandnew Месяц назад

The antenna coil was wobbling around.

@pistachioaudiophile Месяц назад

I'm curious what do you do if you break a coil core?

@electronicsoldandnew Месяц назад

Firstly, you cry. Then you look at it sadly for a while. Then you swear. Then you try and find a replacement core from a trashed unit to replace the one you broke 😊