Bendex AA5 Repair, Testing All Coils

[@saturn5tony]

Most awesome explanation of coil testing. Like Ron said (below) I had a cup of coffee and the this way of coil testing was a great way to start the day. Thanks Rick

[@Ronbob59]

Nothing like a hot cup of tea and a Rick McWhorter video to start the day. Now I understand perfectly how to check coils. Your videos are like peanuts; you're never satisfied with just one. Thanks for another lesson, Rick.

[@f0ggy2006]

Brilliant Video .Thanks for showing us how its done Rick

[@THOMMGB]

Rick, I really appreciate that you show the basics. I'm still learning and your video of how to check the coils, while comparing the actual wiring to the schematic, is invaluable. I also like your idea of using a 9 volt battery to check out the speaker and secondary of the output transformer. Regards, Tom

[@scothans]

I just bought my first AA5 (RCA 65X1) and I'm about to try a restore on it. This was priceless information. Thank you!

[@AllAmericanFiveRadio]

Thanks Douglas Tees

[@AllAmericanFiveRadio]

Thenk Andy It's not a great number of open circuits. But it is enough so that I always test first, rather than replace all the capacitors and then find out a coil is open that I can't get. So if I can't repair the coil I've got new's in a radio I can't fix. Regards Rick

[@AllAmericanFiveRadio]

Thanks Ron Pearson

[@flingwinger1]

Thank you sooo much for all of your videos! they are always informative and easy to understand, even for a dummy like me. I am passionate abut restoring old radios and totally enjoy the hobby. be safe...73, Greg in TN.

[@AllAmericanFiveRadio]

Thanks TheEMEME

[@AllAmericanFiveRadio]

Thanks Bret Frohwein I opened up one of the IF cans in the next video. But I don't recommend doing that unless you absolutely have to.

[@cheops210]

I just finished your book on the AA5, excellent writing. I have been working on various radios (all with Transformer PS or solid state) 40 plus years but never an AA5. I learned a lot especially about the grounding system used vs chassis ground. Thank you ever so much, Perhaps I could have gotten there without th book but I am very happy I didn't have to. Again excellent book. Bill WD5DZG

[@AllAmericanFiveRadio]

I always do the easy stuff first, test all the tubes. Also changing any wax capacitors and electrolytic capacitors, usually fixes any problems. Now this is true for almost any audio equipment.

[@mikedevita7184]

Excellent tutorial. Questions: Any way to test IF coils when there is a resistor across either of the primary or secondary and enclosed within the can with can removal? Also, had any of the coils showed an open what would have been your next course of action? thanks again for a very informative video.

[@TechTins_Projects]

Brilliant! Now I know how to check the coils! Thanks Richard!

[@AllAmericanFiveRadio]

Thank you.

[@AllAmericanFiveRadio]

Thanks hed wig I look for parts radios that I can pick up at a flea market for about five dollars. The harder coil to replace would be the oscillator. Also check out chapter 10 of my e-book.

[@AllAmericanFiveRadio]

I got the schematics from nostalgicair and there is a link to this diagram in the show more of this video

[@BretFrohwein]

Thanks Rick, it's nice to see a little more of your techniques. I wonder if you'll find any more pill-bug carcases in the IF cans.. :-)

[@AllAmericanFiveRadio]

Thanks ostrand11 That is correct

[@AllAmericanFiveRadio]

Thanks starlite2991

[@dwtees]

Tony and Rick, I completed repairs on an AA5 Truetone all wave radio my late Dad gave me in 1974. I found similar resistance readings on all the coils in my radio. Are these readings fairly normal for AA5 radio's? Thanks for more insight as to your repair techniques. Another great lesson and video.

[@AllAmericanFiveRadio]

Hey Gary I find it really irritating to replace all the capacitors and then the set doesn't work because of an open coil. And it is very irritating if I can't get the coil or repair the coil. Regards Rick

[@AllAmericanFiveRadio]

Thanks Tony T. Douglas Tees is right, these are typical values. And I've check so many I don't think about it anymore.

[@briansmith2363]

What does vdc and mfd mean on older style capacitors?

[@AllAmericanFiveRadio]

Volts Direct Current, Microfarad

[@mikethuman9456]

If the clicking is very,very faint using the 9volt battery to test the secondary and voice coil,is that a sign of problems? I did the same test on a second working radio and the clicking was much louder,first radio has no sound but good voltage through out

[@AllAmericanFiveRadio]

9VDC across the primary should produce a click out of the speaker. This proofs the primary, secondary, and voice coil are good.

[@mikethuman9456]

AllAmericanFiveRadio thank you, its very very low compared to my other radio but if I put my ear to the speaker I can hear a slight click so I'm going to assume the test was a success . I love your videos and all American five radio book.

[@AllAmericanFiveRadio]

Try 18VDC the primary should handle 100V+

[@mikethuman9456]

AllAmericanFiveRadio Tried up to 4 9vds connected together there is still a very very low click. Nothing on the on/off middle lug when powered up briefly. It's a pt-7 philco ,I had to change out lots of wires ,caps,resistors so I think I must have something not connected properly.Cant be to bad as it powers up with good voltage.I thank you for your help and videos,books .I won't take up your time anymore, it's close so I will go over my notes ,re-check all my work etc. It just hummed two weeks ago with lots of dry rotted wires so I think I can figure that the out put transformer and voice coil are working . Just need to find my error, once again thank you. ( I have lots to learn and your videos are extremely helpful for me )

[@AllAmericanFiveRadio]

Check Plate voltages

[@hedwig85]

hi rick, great view of your testing method !! I was wondering, what would you do if you found one or more open coils?

[@TonyButchT]

Thank you for another great lesson! How did you determine what resistance values to look for? Like the 26, 24, 21, 27, 164 ohms...etc.

[@AllAmericanFiveRadio]

Thanks scott hanson

[@AndyDaviesByTheSea]

Nice clear explanation Rick, have you had many open circuit inductors? Regards ... Andy

[@billybonewhacker]

awsome job!

[@AllAmericanFiveRadio]

Thanks billybonewhacker

[@swale12]

thank you

[@AllAmericanFiveRadio]

Thanks f0ggy2006

[@flingwinger1]

Where do you get your beautiful schematics???

[@MrUbiquitousTech]

That's a great tutorial, thanks for sharing! A couple of questions though: That chart shows three sets of values, listed as 294/198/175, I gather from your readings you used the 294 column. What are the other two columns for and what do the numbers mean? And is there a generic value we can use if our schematic does not have coil values on it? Thank you!

[@AllAmericanFiveRadio]

Thank you.

[@AllAmericanFiveRadio]

Thanks Helios Haul That is correct it says 4-9-46

[@helioshaul3924]

What year is that radio from, Thanks.

[@AllAmericanFiveRadio]

Thanks saturn5tony

[@saulomoura9402]

I do like so much this video help me and give me information about repair oldies radios. Thanks.

[@mikedevita7184]

without can removal

[@dalegirard8453]

Red red red is 33k

[@AllAmericanFiveRadio]

www.newark.com/resistor-colour-code-calculator

[@dalegirard8453]

@@AllAmericanFiveRadio ur right orange orange orange 33k

[@sssttt6533]

Nice

[@AllAmericanFiveRadio]

Thanks THOMMGB

[@AllAmericanFiveRadio]

Thanks swale12