Trio / Kenwood KW-70 Stereo Receiver 1962 Review Part 1


Hello YouTube in today video I will be reviewing a Trio/Kenwood model from 1962 and this is, it is the most interesting and most characteristic Trio production model KW-70 It was from the early of 1960s and had typically what you can see fifties decorfor those years He stood out among the most of the equipment producted in those years with a presented vintage look Which he maintained the pastels colors. The KW-70 electronics is very expensive and nothing can be accused of it. At the input of the FM tuner there is the head with two triodes 6AQB/ECC85 which provides three-point tune. One of the ECC85 sections works in the ARCZ automation system. After the head is the intermediate frequency block on four lamps ends with a demodulator on a vacuum dioode (i.e. lamp) 6AL5 / EAA91. Behind the tuner is the MPX set-top box on the 7247 and 6AQ8 / ECC85 lamps delivering a stereo signal with high separation. This model as you can see It was the global model So, He has an extended VHF range from 80 up to 108 megahertz in addition to the FM range and AM range This receiver which is fine and actually quite awesome His allowed reception of medium waves 535 up to 1605 kilohertz. The complement in my opinion for this tuner’s is that he has two magic eyes EM84 lamps Which are based here- One is for the tuning beamStereo indicator so, one indicates the level of the receiving to beam signal while the other is for the MPX signal stereo indicator as I said before. Using the lamp as the indicator of the MPX(stereo) signal was rarely practical solution because it was kind of let’s say not so cheap. Kenwood only madeit in this one model, only in this one model. There was a few variation of this model, but only in this one. Going later on. The preamplifiers for the signal from MAG / XTAL turntables and also for the type HD recording head are based on 12AX7/ ECC83 lamps. I hope I don’t screw this one up. After them the next equipment in those In those days the next fancy equipment of his model was the rumble filter of course we have standard loudness Noise Filter and also FM AFC which was lets say veery fine for it. This it has also a very nice addition- Which come when you use a stereo-phones so you’d use your headphones you can turn off the speakers, which was fine-nowadays it is pretty much everywhere but “I hope” butin 1962 it was a really nice touchfor this model. I was talking about this. So let’s say This receiver mine, of course Has all notes and also all of its condition is as you can see I will in a moment turn the camera around. Hopefully enough loud voice Anyway coming back The control lamps are 6AN8, Hope I don’t screw up this And the final ones are typical 7189 / EL84 / 6P14P. The final amplifier was a typical Push & Pull with adjustable bias. Kenwood In all those Amplifiers from that era can did not use any equipment to regulate regulate bias Because it has adjustable bias. Yes and all of the end tubes get the same voltage because of that which was on the first grid -14.8W. The power supply is of course based on a proven voltage doubler solution, so double times voltage dumper. Kenwood use the solution in (not only)this model (but in )actually any other model with the end-lamps of 7189 and the correction preamble was also a standard design. The producers they said about the power of this receiver on paper 32.5W Sorry and the music continues continuous power was 25 W per channel. The resistance of the columns is actually pretty nice Let’s say, okay I want-I will show it to you now. It is actually pretty damn fine. You can actually choose the range of The arms the range of the Ohms you can actually choose, which was not very often that that was my knees3 Yeah, I Don’t know you can see it Wow Yes, you can choose from 4 ohms up to sixteen ohms (4-16), of course with eight ohms as the option. It was actually in Europe or let’s say mostly in United States was the standard thing but in **JAPAN**:very fancy hing.Tuning beam Of course the Rumble Filter, Loudness FM AFC and also Noise Filter the volume control of course. Bass treble imbalance, of course seperated for both channels. *some useless speech of mine. Selector for AM/FM/FM Stereo/Phono/Tape/AUX modes : Left/Right/Stereo/Reverse lets go behind of it – I have the original instructions and diagrams form 1962 Okay we have TAPE HD we have MAG and XTAL phono connectors, AUX Anyway PC REC&PLAY connectors for the tape Recorder, okay, so it’s quite rich Here’s four diagonals. We have of course tables really fine separator/selector for the ohms speakers-phase, which is fine. Here. We have inside of course the Switch for 110 Up to of course 117 volts and 220 230 so very nice thing because you don’t need a separate block Separate transformer for that thing. Of course, we have champions balance Also because we have fuse We can actually on unscrew this fuse Check out it, yeah. It’s pretty 2A being pointless for a mo. Okay for the internal/external FM/AM antenna also grind for it. And very nice output for external things likeclock/anything maybe even tv. Okay. So, that will be almost all for this part of the review. Okay, let’s check out All the original instruction About how to proceed how to control Function what is the control for? Example yes power control *for turning this machine on/off-no shit* we have the inter-connection diagram Let me show you this because it is quite fine Yeah So as I said before Standard things So so so going a Bit this video again We have specification Yeah, it has 23 tubes a lot of tubes especially for that era Yes I will post the description to the radio – museum or stuff like that where you can find it for free and of course we have the full sizeschematic As you you won’t be able to see a lot of this but also I will post this in the description because You are able to find a clean PDF version of it online. diagrams for this device. So the last and I guess just think about this Has sme of the tubes replaced So it has of course looking condition and minimal traces of use but Except that the original knobs onto the screws and lampsin radio truck and preamplifier with a magical eyes Are from Japanese production with exellent emissions. But the control arms in my model was replaced with the military military version of John “JAN”from Phillips 6AN8. And the power lamps are the Soviets 6P14P so they are the perfect constraining Soviet ones. Also for the last and actually last thingI want to say that this is a really great receiver very rare in this condition and I really love it

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