Philips 850A

Radiotechniek album
Philips 850A foto 1
A Philips 850A. What was once a beautiful stately radio device is now no more than a wreck. What could we make of this radio?
Philips 850A foto 2
The chassis, which is supplied separately, is a composition in rust.
Philips 850A foto 3
The underside after years of standing still under bad conditions.
Philips 850A foto 4
The engine tuning. What once made this device special is now a jammed old mess.
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The chassis has been given a different end tube. It was a war tube.
Philips 850A foto 6
Free expression has run its course here.
Philips 850A foto 7
The power supply. Could this radio set play again?
Philips 850A foto 8
The cabinet looks like a lot, but a terrible spectacle is coming.
Philips 850A foto 9
The speaker cloth of this radio was original. No one on the auction site had seen that. For me this was the reason to buy this beautiful radio device.
Philips 850A foto 10
Part of the cabinet under the mechanical memory of the motor tuning was knocked away with an axe.
Philips 850A foto 11
Here you can clearly see how part of the cabinet was knocked away with an axe.
Philips 850A foto 12
The keyboard is completely bulged by the moisture. Inside, the wood was cracked and broken.
Philips 850A foto 13
Another terrible drama. There should be 5 bars on both loudspeaker grilles. the bottom of both sides is missing.
Philips 850A foto 14
The inside of the keyboard. The keyboard is completely warped.
Philips 850A foto 15
The keyboard clearly shows how the wood has broken loose.
Philips 850A foto 16
Here you can clearly see how one corner has been knocked out of the cabinet. Replacing the bottom plate is the only option.
Philips 850A foto 17
The bottom plate consists of two parts, the lower part is good and usable. The second part is plywood. This part has been worked with the ax but has also been completely under water. Where the layers of the plywood had come loose. And the whole of misery fell apart.
Philips 850A foto 18
Carefully remove the footboard.
Philips 850A foto 19
Here the loose layers of the plywood.
Philips 850A foto 20
Removed the keyboard.
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The pieces of the keyboard, the two large parts, were one whole.
Philips 850A foto 22
The rusty nails that came out of the radio cabinet. With a lot of effort.
Philips 850A foto 23
Removed the bottom plate.
Philips 850A foto 24
The cabinet bare. Bottom plate removed.
Philips 850A foto 25
Re-gluing the keyboard.
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New and repaired parts fit in the cabinet.
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A view of the bottom of the radio cabinet.
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Assembling the keyboard and measuring the push buttons.
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The top view of the keyboard.
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Glue the bottom into the cabinet.
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The cabinet with bottom.
Philips 850A foto 32
Gluing the keyboard into the cabinet.
Philips 850A foto 33
Here you can see that the keyboard will straighten itself in the cabinet.
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Cabinet with sound wings and keyboard.
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Repairing the speaker grille.
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Here bending a brass rod.
Philips 850A foto 37
The speaker grill viewed from above.
Philips 850A foto 38
Here's an idea of the end result.
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The speaker grille.
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The inside of the speaker grille finished and riveted.
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Both speaker grilles repaired.
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The copper work is ready to go back on the cabinet.
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The parts of the engine tuning.
Philips 850A foto 44
Tuning capacitor wheel.
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The parts cleaned and ready for assembly.
Philips 850A foto 46
The slip clutch is a whole again.
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Drive of the motor tuning.
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Fully assembled and completely new.
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The engine up close. Everything about this piece of mechanics is back together.
Philips 850A foto 50
A new chassis from the production line. Also a new push button unit. And a new power transformer. And on the right the new motor drive. Beautiful, isn't that production of the year 1938.
Philips 850A foto 51
The buttons unit from the keyboard.
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New components placed loosely on the chassis.
Philips 850A foto 53
Restoration of intermediate frequency band filters.
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The chassis with the new components.
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Everything that needed to be riveted to the chassis has been done.
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The construction of the electronics can begin.
Philips 850A foto 57
We use original wire for the wiring.
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Wiring the chassis.
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It must also be wired at the top of the chassis.
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Of course we use new tar capacitors.
Philips 850A foto 61
The wiring is mounted on the chassis again.
Philips 850A foto 62
Building the subframe with a high-frequency receiver coil and band switch.
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A separate test of a high-frequency circuit.
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Here is the loose setup.
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The tuning capacitor and the first high-frequency circuit are fixed on the chassis.
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The construction of the low-frequency part.
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The second IF circuit mounted on the chassis.
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The rebuild continues slowly.
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Intermediate frequency circuit detector test.
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Measured at the output of the detector. Input is first grille IF tube.
Philips 850A foto 71
Installed the first bandwidth switch and mechanical part.
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Tuning indicator EM1 installed and tested.
Philips 850A foto 73
Low-frequency part done.
Philips 850A foto 74
All tubes are on the chassis.
Philips 850A foto 75
The revision of the first intermediate frequency band filter.
Philips 850A foto 76
A stray neighborhood frog coming to help me.
Philips 850A foto 77
Look the neighborhood cat strung the beads.
Philips 850A foto 78
Mid-frequency bandpass filter ready with lampshade.
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The chassis looks beautiful. Completely late 1930s but new.
Philips 850A foto 80
The construction of the high-frequency part the second high-frequency stage is placed.
Philips 850A foto 81
The shielding shots between the high-frequency stages are also very important.
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The oscillator section completely overhauled.
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Testen van de ocillator
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The chassis is already starting to become quite complete.
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The top also looks like a Philips 850A.
Philips 850A foto 86
Tuning the oscillator.
Philips 850A foto 87
The coil buses together on the left, the two high-frequency stages on the right, the oscillator section.
Philips 850A foto 88
To place the shift rod for the wave range switching, the oscillator coil had to be removed from the chassis.
Philips 850A foto 89
Component placement is just very precise.
Philips 850A foto 90
The chassis had to be removed from the repair stand. Otherwise, the switching rod for the wave range switching could not be placed.
Philips 850A foto 91
The cassis back in the repair stand.
Philips 850A foto 92
Here you can see how tight it fits. The shift rod of the waveband switching just passes the ceramic capacitor.
Philips 850A foto 93
Meanwhile, the drive mechanism of the engine tuning has also been installed. And the chassis is equipped with new tubes. Unfortunately not the EM1 which has been made unaffordable by handy Harry.
Philips 850A foto 94
The chassis with a few new buttons. And the coupling between the drive and the mechanical memory of the motor tuning.
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Here's the coupling up close. Nice piece of technology that makes the radio so special.
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The chassis is now complete. Here's a picture of the component side.
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This video shows the operation of the engine tuning. Unfortunately, medium wave stations cannot be received well here. At the time of making the movie.
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Here's a photo of the back. All the details are there like rivets.
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The front side of the chassis.
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The next problem is the dial hood. The dial pointer is projected as a light image on the dial. This makes the setting of the dial pointer very precise.
Philips 850A foto 101
What do you need for that. A new dail cap, of course.
Philips 850A foto 102
You also need a mirror, mirror on the wall who is the nicely's of us all?
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A dail with working lighting.
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A way to move the dial pointer from left to right and vice versa.
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And here begins the adjustment of the dial pointer relative to the dial.
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And this is the light image.
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The shape of the lamp is very important here.
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The reflector is also very important, a lot of rust just doesn't work.
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And a good mirror, mirror on the .....
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Then you get this light image over the entire dial from left to right and vice versa.
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And then the surprise.....
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A new cabinet for a Philips 850A.
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Or is this the same cabinet? That's impossible.
Philips 850A foto 115
This cabinet is truly beautiful. The shine the deep drawing in the veneer.
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And yes this is the same cabinet. There are people who can restore this so beautifully. And unfortunately I am not. But whoever did this cabinet is an insane craftsman.
Philips 850A foto 117
And such a speaker grille looks great on such a cabinet.
Philips 850A foto 118
Because there is a new bottom in the cabinet, the chassis must be measured again in the cabinet.
Philips 850A foto 119
And that is not easy, the press studs must run smoothly and must not get stuck.
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Placing the chassis took me a lot of time.
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But finally the chassis is in place and the feet under the chassis have marked the place in the bottom shelf of the cabinet.
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Here is a picture of the keyboard and its position in the cabinet.
Philips 850A foto 123
Nice isn't it chassis in a new cabinet.
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You can somewhat recognize a radio in the front.
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Placing the cloth. The cloth has not become new but is still original.
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And here you can see how the loudspeaker is mounted in relation to the cabinet and the sound wings.
Philips 850A foto 127
Now it has already become a radio. Only the press studs left. And both lampshades.
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The speaker cloth is back in the cabinet. Time to do the rest.
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The speaker back in it's place.
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Here you can see the part of the cabinet that was knocked away with an axe.
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And here's the bottom plate back on. the two small pieces are still missing.
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And so the smallest details have to be restored.
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Because you want the keyboard to look like new again.
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Unfortunately, a piece of the aft bulkhead is missing. But we are still looking for a solution for that.
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The cabinet is like new again.
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And with the picture we started with, we also end. Everything can be restored. Often it is a matter of time, money and patience.
Philips 850A foto 137
This video is an encore. How does an 850A play on a local AM station in this case ExtrAM. This radio is new and this was the first cabinet test with its own loudspeaker.