I am going to get the BK 1655A for my bench. thank you, Tony, for showing and explaining this unit and what its functions are!!!
@PicaDelphon
5 жыл бұрын
So classic, and So simple in the Design..I love them..
@h3tv
5 жыл бұрын
Thanks for a great video on this tuner. I bought a used MR 71 about 40 years ago and have played it several thousands of hours since. Up to now all repairs have been 5 or 6 tubes total. Now it has issues and I now have a great starting point. I'm sure it will need all of what you did and replaced, I have some basic knowledge of tube equipment repair and also on the spot situations like my Fender tweed guitar amp is crackling so loud everyone in the band is looking at me and we just started the first set of the night. I enjoy your videos both transistor and tube, though I am a tube-a-holic.
@jameslucas6589
5 жыл бұрын
Really nice to see a Mc instead of another Pioneer. Anything built by McIntosh was built to be used for an entire lifetime. They are a treasure. Snowfall, we had ours well over 3 weeks ago here in VT. This is going to be a really cold winter. 27 for a predicted high on Wednesday.
@kev-the-windsurfer.
5 жыл бұрын
I always enjoy these videos, especially the tuner alignments/repairs/reviews, I have two McIntosh tuners, a MR78 and MR80, both exceptional performers. I was thinking, to demonstrate these tuners and and sound quality of them, you could take the line output and put it into your camera or whatever it is you are capturing the video on if it has a stereo line input? You could even use a small mixer and have your Mic on as well so you can talk to us but then you could fade in the tuner and have us get the full quality instead of hearing it in an ambient fashion through the mic. Just a thought, I only just thought of this in the last few seconds of you video. Thanks for posting, I actually have been wanting to get a MR71, and now seeing this, I want one more than ever!!
@Chrissy4605
4 жыл бұрын
McIntosh was just making a name for themselves back in the early sixties!!!
@1215Runnymede
5 жыл бұрын
Mr Carlson's Lab has a video showing how to determine the outside foil of the cap and why it's important to wire the outside foil to the low side of the circuit.
@gizmothewytchdoktor1049
5 жыл бұрын
12 jan 2019 and snowing here in va :-) now...if we only had a decent radio station to listen to ;-) thnx tony!
@phillipleroy1452
5 жыл бұрын
I definitely want to see the capacitor foil comparison! Great show today!
@RickMahoney2013
5 жыл бұрын
Now I know why McIntosh was so popular in Baltimore Maryland, they were original base here.
@garybevis8691
5 жыл бұрын
Another good way to bring up equipment under test very cheaply is to use a home made current limiter such as a "Dim Bulb" tester using an incandescent bulb in series for limiting current at voltage. There are many good examples of dim bulb testers on the youtube. I use CRC contact cleaner for years and it is great stuff.
@DaveMcAnulty
5 жыл бұрын
Look at the light bulb to the right of his variac :D
@deadfreightwest5956
5 жыл бұрын
Snow?! We've had our first two days of frost this year up here in the Pacific Northwest. BTW, I like the sound of your furnace in the background, makes me more comfortable looking over your shoulder.
@budandbean1
5 жыл бұрын
Snou? Snough? Snow? What’s that? Sorry, Florida Guy... :-) Hey, just wanted to say I really loved watching this video today, it was really great. A lot of these problems are typical of the radios I like to work on, it was interesting hearing you explain why. It was also fun looking at this hybrid circuit and particularly the multiplex circuit. I also work on guitar amps and have seen that many times. Isn’t it a different world to have a good readable schematic. Great video!
@buildstoys
5 жыл бұрын
Just had our first snowfall yesterday in Upstate New York.
@bulwinkle
5 жыл бұрын
Nice McIntosh, but you wouldn't want to wear it out in the rain.
@richardkelsch3640
4 жыл бұрын
Capacitance is calculated by the speed at which a set voltage and amperage is introduced with the capacitor being tested. If the capacitor is leaking, it will take longer to charge that capacitor. It's not really "double the capacitance". It's just throwing off the test equipment measuring it.
@dhpbear2
5 жыл бұрын
41:11 - Selenium rectifiers emit cyanide gas when they fail. They HAVE to be replaced!
@14.1guy2
3 жыл бұрын
Hydrogen sulfide, not cyanide.
@StealthParrot
5 жыл бұрын
I have an old Magnum Dynalab FT-101A tuner which sounds great. It's solid state and has a seemingly much lower component count. How do you think it would compare sonically with the McIntosh?
@1959Berre
5 жыл бұрын
Putting that schematic on top of hot tubes makes me kind of nervous.
@dhpbear2
5 жыл бұрын
25:06 - That's an unusual symbol for C15 (in the V2B grid circuit). I assume it's a capacitor with an electrically isolated metal shield?
@johnsimms3957
5 жыл бұрын
What are some of your favorite current production vacuum tube brands?
@moodyga40
5 жыл бұрын
the UF4007 diodes work the bes in theses tuners
@InsideOfMyOwnMind
5 жыл бұрын
It would be interesting to see how you would rate one of these next to a Marantz 10B.
@rudigerhoppe5708
5 жыл бұрын
Nice video. It's a shame FM radio is literally being turned off here in Scandinavia. Norway has already and the other countries will follow soon. All dab after that.
@jakep8484
5 жыл бұрын
Radio is the US is still very popular so should be around for a while.
@argokan
2 жыл бұрын
Haven't they reintroduced the FM in Norway, some time after after that unfortunate decision? Sweden was considering that same decision, but decided to hold on and keep the FM for a while longer, although the question is left pending, as I have understood it...
@rleeAZ
5 жыл бұрын
Any issues with silver mica migration in the IF cans on these units?
@InsideOfMyOwnMind
5 жыл бұрын
It amazes me that I haven't seen it on these. Perhaps he has. Maybe just a better choice of materials on the metal plates? I can think of several factors to cause or avoid this.
@xraytonyb
5 жыл бұрын
I can't tell you why, but I've never seen it nor have I ever heard of it on a McIntosh Tuner. All I can say, is they know how to build 'em!
@russellesimonetta3835
5 жыл бұрын
Us guitar amp guys call the opticouplers " roaches".
@MasterNiva
5 жыл бұрын
I can see behind the tektronix scope a pioneer car stereo from 1970´s I had one of them and before the digital era, it was just great sound.
@Dangrdav
5 жыл бұрын
Tony did a video on it. Take a look
@dontcare563
5 жыл бұрын
Did he say MR-41 at the beginning of the video?
@Chrissy4605
4 жыл бұрын
Yes he did!!!
@DAVIDGREGORYKERR
5 жыл бұрын
Can you not get Germanium transistors from the CCCP.
@eddys.3524
5 жыл бұрын
mmm.... seems kinda useless to me to have nice foil capacitors (1uF) in series with electrolytics (10uF) in a signal-line, when the audio one listens to goes through the electrolytics. Can you please explain why?
@xraytonyb
5 жыл бұрын
I'm not an expert on this circuit, but I'll try to give my best answer as I understand it. The original design just used the 1uF cap to decouple the DC from the tube to the output. The later design added the 10uF cap in series to (I think) provide a bit of signal for feedback. The original caps for both versions were all electrolytic, as 1uF caps in paper/foil would have been quite large, let alone the 10uF. Upgrading the 1uF to film could arguably improve the sound a bit because the film caps are more accurate in tolerance and possibly noise. That said, a modern 10uF film type would still be rather large. Also, as the 1uF and 10uF are in series, the 10uF isn't going to have much influence on the signal as the lower value 1uF will act as the high pass filter. The Nichicon FG series electrolytics are designed for audio. They are low ESR and have mechanical dampening built into their design for reduced noise. The case is tied to the negative terminal and therefore acts as a shield. I most likely could have used one of them for the 1uF cap, but as most electrolytics are +/- 20% tolerance and the films tend to be a lot better, approaching +/- 1% I chose to use the Solens (which I had in stock). Thanks for the comment!
@eddys.3524
5 жыл бұрын
@@xraytonyb Thanks for your answer to my question. From my point of view I'd only exchange the original 1uF electrolitic for a 2.2uF film capacitor, avoiding the extra complexity coused by the 10uF electrolytic.
@EJP286CRSKW
5 жыл бұрын
xraytonyb No. All they did was _move_ the 10uF capacitor from next to the cathode to the output point prior to the pots. It was always present, and so was the NFB. The purpose of the change is unclear. The effective output impedance to the pots is now 0.909uF, which is close enough to the original 1uF not to affect the frequency response.
@EJP286CRSKW
5 жыл бұрын
Edwin Slee You can't do that. There is 1.5VDC, coming from the cathode bias via the NFB, present at the output side of the 1uF. You can't leave that on the AC signal. You have to decouple again, or else decouple the NFB as per the original circuit.
@xraytonyb
5 жыл бұрын
@@EJP286CRSKW Thanks so much for the info!
@cahuec1
5 жыл бұрын
Hi friend, what´s up? I send you one e-mail one week ago. I have one Pioneer KP 500 and i´m trying to do that auxiliar modification that you do, following your squematics. Would you help me with this, pleaseee? Tks man.
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