Ultra Probe is a great device ! I was amazed when you started using it . Very smart Mr.C .

Mr. Carlson’s Lab is very likely the best channel on all of KZbin

Very good job merry Christmas

my radios are not older than the 70s- so I just use a little FM transmitter with a BT interface (ment for cars) that works pretty well and the quality is comparable to a real radio station with a strong signal. Would that be possible with AM?- or is the AM audio quality noticeably worse? (there are no AM Stations in my country any more and I can't remember how the quality was..)

Just write the value Philips

Stop playing with this. US people get crazy last weeks because of the lights... :p

Happy holidays sir ! Another magnificent job you did here 🏆. I'm glad you covered this topic since I've yet to perform a Bluetooth mod. But, enough people are inquiring about it now til I've accepted that day is coming for me. This video will serve as a useful guide when I finally delve into this. Having the function changeover switch tuner controlled is inspired. Hoping it'll be possible for me to arrange that or similar on the "lucky" radio I first tackle in this. I was also interested in your finding the cause of the excessive hum/buzz from this set. It seems Stromberg Carlson chassis are of a finicky nature due to their comparatively high gain audio designs, radio and otherwise. I once recapped one of their record players, a HiFi mono model PF-530 (Sams set 423 folder 21). Upon completion, it hummed excessively, the sound had an annoying "echo" quality, and blue glow was present in the 6V6 outputs. None of these conditions previously existed. The service was brought on by a too hot operating multicell filter capacitor. It was time for full service. After hours of struggling, I ended up relocating the cathode bypass capacitor BACK to being a section of the new twistlock pwr filter I had installed complete with observance of the original lead dress which I'd removed in favor an axial bypass close mounted and grounded right at the output tube sockets. Problem solved. It's the only time I've had that issue with a record player. Normally there's either no discernable difference or improvement moving the bypass closer to the outputs. One time, it apparently caused harm and it was a Stromberg. I think the problem was the removal of the original wire but either way everything returned to normal once I adhered to the original design. It's one of the absolute best sounding recordplayers I've ever heard to this day 🏆. It's one of a few in the mid 50s that were originally equipped with a .7 mil diamond stylus for LP ! Stromberg Carlson ahead of their time again.

It would be great to make a Bluetooth board with tubes too 😊

Merry Christmas Mr Carlson !

I think uncle fester invented this test method.

Thanks😊

Hi! Very nice, very nice, very nice! Can you offer up the relay board for sale? It would be nice to get a few for my future projects!

My son has a modern guitar amplifier it only works with Bluetooth now paid 250 for it just wondering what the problem might be

Paul, another find restoration and I just love your integration of the frequency pixie tube project. I always learn a bunch on these videos and this receiver is something to be proud of. I appreciate your making these videos.

I would point out that the reason for the 10 kilocycle (kHz) notch filter was to eliminate the 10 kHz beat note from adjacent frequency radio stations. I have a Truetone 724, a poor cousin of the 727, waiting on restoration. This video will be a help.

As the advertising suggests, "There's Nothing Finer Than a Stromberg-Carlson"

light bulb trainer. Extremely cool. Some light bulbs will blow.

Paul, great video and would like you to add the additional range in the kilahertz to do am and shortwave.

I wonder if they ever made a sensitive two-valve radio?

Great video, it would be cool if the bluetooth board could control the eye tube.

Mr Carlton my son collapsed into its own gravity creates the black hole if we push electricity through an inductor in the Bermuda triangle will it open a window to travel through time collapsing into its own magnetic field like a rock thrown in a pond it creates ripples in the Bermuda triangle it doesn't pull towards magnetic north

Once, I was choked for touching with plastic twizzers a wire coming out of one side of a small high voltage transformers with one hand on the chassis.

Mr. Carlson. I have a MS4448PAE. I have one leg that under load my voltage drops from 119VAC to 108VAC. Is that something that can be fixed?

Cool project! Just a thought: A single screw mount at one end of the mechanical switch can be problematic. Over time, it could rotate out of reach and become non-operational. Instead, a non-contact optical switch would be a better long term solution.

Dear mr. Carlson, greetings from Amsterdam. I wonder how the stereo-to-mono conversion actually works, since, through the two capacitors, the output impedances of the left and right channels of the bluetooth board are actually put in parallel - and I guess the input impedance of the volume pot is relatively high compared to these output impedances. Summing will occur, but also quite a bit of (frequency dependant) attenuation, especially since you use two capacitors to create the sum-signal. Just being curious, wishing you all the best, and thanking you for your nice channel. From Amsterdam, NL, Peter.

I love the thumbnail, Professor! :) It brings out your crazy scientist side that all us deeper diving techy gearheads have in common.

Nice piece what a cabinet.

Retired electrical engineer here with emphasis on the word "electrical". Electronics was never my forte. This is really good stuff. Happy to see Mr Carlson distinguish between conventional current & electron flow.

Thank you. Merry Christmas and happy new year.

Loved it I’ve redesigned very old radars with modern FPGAs VME Boards and reduced the design to single cabinet. It’s truly a lot of fun making old stuff modern.

I know what I'm going to do... I have the same speakers with the same issue. Thank you.

Merry Christmas 🎄

Very cool! I got totally that you wanted to make the modifications as minimal as possible for a potential removal... but, I would have added one relay to your magic little circuit and a couple of LEDs to switch from the original back lit to a blue one during Bluetooth operation. But again, sure cool idea!

Frekans modülasyon signal generator.

Wonder if you could integrate the eye tube as a level indicator for the BT

Have been wanting to do this with my vintage way back when tube chassis

Just amazing learned so better than my BEE professors back in University. Thanks for a great video loved it. 73s Mike wb7qxu

No entendí porque

Comment for the algorithm.

Now that is genius engineering at installing a blue tooth audio input to a 1930's technology electronics so you can play back music from your smartphone. Question how would you install a direct raw audio input into this old radio? See some of us still use component CD, tape and Phono players and it would be nice to play those through the radio's audio.

*Open chassis 🤦🏽‍♂️

Pen chassis please 🙏

So fortunate I saw this, I was about to purchase an APC Back-UPS Pro, 1600VA/960W

Dats awesome..yeeeh

I'am sorry but youtube translate automatictly your video in "french" with a robot voice, so it's impossible for me for watching it.

They're not usually that long. I don't want to force anything in. ...can use the rounded head... ...uses all the existing holes... I've been watching way too many AvE videos.

can you cover that buzz inducing transformer in aluminum foil to reduce buzz?

I just used the phono or aux position on mine.

Mastercraft screwdriver, Robertson screw head..... True North, Strong and Free. 73, from a VE7.

I can imagine that in a cosy room with a crackling fire playing christmas tunes......fantastic upgrade to a beautiful old radio👍