Grand Prix Moderne Stereo 609 - now with EK 4

104 replies
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Time for a little restoration write-up again.

The wonderful Grand Prix Moderne Stereo 609 was always one of my
own favourites (among many others...) and I have a couple of them in
my collection waiting for restoration but time has not yet permitted much
to that effect.
However, a couple of years back I came across the one pictured in this post.
Looking a bit sorry for itself and I bought it more or less with the
thought in mind that it could hold many valueable parts for the others when
their time comes. Locating set-specific parts can be difficult, especially when
it comes to the old valve things.
The other day I rediscovered it and gave it a closer look. At first glance
not the prettiest sight but on the other hand not the worst either and it
seems to be typical for me to try to save as many B&O's as possible and following
that track, I decided to give this one a chance of a second life.
I will update this thread as work progresses and as time allows.
Let's see how far this will come.

 

Martin

Looking forward to this one Martin! As the owner of one of the stars of a previous restoration thread, I can vouch for how entertaining they are!

What is the 'FONA' badge in the middle of the bottom of the fascia for, BTW??

Was this one of the first ever B&O in car entertainment systems with integrated cup holders Martin?😁

Looking forward to this one and don't forget where I am if I can help at all.

 

Chris.

Way-hey!  We're off again. 🙂
Thanks for doing this Martin, we love these photo-restoration threads!

Thanks guys, very reassuring to know I have backup from you.  🤒

This set, being a Grand Prix, was top notch at its time.
Built in 1962-63, its circuits and build quality was close to the max of what was possible
for a livingroom set back then and it's a superb performer when setup and serviced properly.
The owner had a choice of AM (LW/MW/SW) with a built-in AM antenna and FM
(requiring an external antenna) with the option of stereo in
the form of an extra module to build in. DIN plugs at the back are provided to
connect a turntable and a taperecorder, suggesting that the Grand Prix was meant
to be the center piece of what would potentially have been a quite impressive
sound system.
The Grand Prix supports an optional external echo-unit. This was probably mainly
a fashion-thing, only lasting a couple of years and I don't really see the
point myself, unless trying  to achieve a "broader" hall-like sound.
Actually the so called echo-unit is more like a reverb unit but that's another story.
Not to my liking anyways and not many echo units exists, suggesting that it, not
surprisingly, wasn't a huge success. A (valve-type) socket is provided for
the echo unit at the back just below the 4 DIN speaker sockets (2 pairs).

A vast amount of controls are available and still it's easy to navigate and
use on a daily basis.
The top two round knob-like things are dial lamp holders which also holds the
dial glass in place.
The dial glass is actually perspex and very light so it sits firmly, held in
place only by those two holders.
The holder caps screw off and the dial lamp pops out, making dial lamp replacement
a 10-second job.

The next pair of round knobs have separate inner and outer knobs.
The left one has the outer portion functioning as the volume control and
the inner portion rotates the built-in AM ferrite antenna.
To the right, the tuning knobs, inner portion is for FM, tuning on the lower
part of the dial and outer portion controls AM with it's separate dial pointer
on the upper part of the dial.
The little round knobs on the bottom row are from left to right:
Bass, echo-amount(and echo off), balance and treble.
The push-buttons from left to right are:
OFF, Speakers 1, Speakers 2, Stereo, Turntable, AFC/Antenna, LW, MW, SW1, SW2 and FM.
Pressing both SW-buttons at the same time selects Tape.

Tuning is childs play.
The AFC control switch is also provided as a function on the tuning knob in that
pushing inwards on any portion of the knob (at FM tuning), switches off AFC
while tuning and back on again when the knob is released.
The "magic eye" tuning valve with it's distinct green bar will help you find the
best signal point and the AFC will help keep it.

All very fine but what have we got to work with then ?
Bad things are that the cabinet is showing signs of a life in the basement, serving
as a platform for cans with fluids, paint or the likes. It also has some water-stains
and a split along its right side.
Apart from this, the cabinet is largely unmarked and I wouldn't be surprised if
it could be brought back nicely even if it will probably never break completely
free from its history.
A knob is missing. This type of knob was used heavily on B&O's TV's and radios
in those years and still they can prove hard to find. I don't see it as a huge problem though, at least
not for the time being.
The FONA decal, because that's what it is, was put on by the dealer.
FONA is a large chain of radio dealers in Denmark, they have been around for ages
and actually just recently stopped selling B&O.
I enjoy preserving labels and decals like this whenever possible but
this particular decal is not as nice as it looks in the photo and it would be
very hard, if not impossible, to restore the cabinet while preserving the decal
so I'm afraid it will have to go. Not being something B&O intended in
the first place, I have no problem accepting that.

Good things are that the rest of the set seems to be fairly intact. The dial is
unmarked, an important factor, and the back and bottom covers are both
present with the odd, almost mandatory missing, screw.
The mains flex is the original standard figure-of-eight type, looking safe and sound.

Thanks for your kind offer Chris, it may come in very handy as it did last time.
It would have to be a huge car to fit this fancy "cup holder with integrated radio"
in the dashboard, for sure. Not really portable either, no remote control and
I'm sure, it wouldn't know what to do if shown an mp3-file.  😂

 

Martin

🤒 from me too!

Always great to follow your threads as they develop!

SIDE NOTE: Your assistance back in in pre-BeoWorld days saved my bacon, and I will never forget it! It is why I shall remain a gold member on the new rev of the site! Thanks for everything you do! Now, back to the show! 🙂

I'm also looking forward to a new restoration thread !!!!!

The restoration threads are my favorites.

Thanks for doing this, Martin.

 

Rudy

Thanks Jaff and Rudy. 😕

There's almost always two types of faults in a restoration candidate like this;

- The original fault.
The fault that caused the set to be taken out of service and parked in the
attic or cellar because it was no longer doing what it was supposed to
and paying to have it serviced wasn't considered a feasible option.
This type of fault could be anything really, could be drastic so the repairers
quote was too high or as simple as a cracked solder joint that wasn't
even investigated.
It's also possible that the set didn't fail but merely got too old and was substituted
by a more modern model or it was simply no longer needed. My experience in these
matters has it that these situations are quite rare.

- Storage faults.
Faults that slowly develop with age and lack of use.
Capacitors spring to mind as candidates for this. They leak and dry out with age
and this will have to be corrected before applying power to the set for the first
time in decades.
Mechanical things will also seize up if not used regularly and, depending on the
storage conditions, rust and oxidation in switches, sockets and contacts will
also play a role.

No doubt, this set will have both types. Strange if it doesn't.

Martin

Off with the rear and bottom covers and let's have a look inside.
Looks fine with a nice layer of dust with no obvious signs of recent activity
(no wonder since I've owned it for a fair amount of years and haven't been
inside it before now).
Undisturbed is usually good in that most things are presumably present and in
their right places.
Indeed, it seems all valves and other major components are here.

Martin

What a beauty, no less than 11 valves will be working in here - hopefully.
Having a closer look, I can already spot a couple of hours work now;
- The dial string for the rotating AM ferrite antenna has snapped. One end
of string is hanging down over the top metal chassis cross-bar, right by the two
left-most blue capacitors on the vertical amplifier board.
- In the bottom right corner is an aluminum can electrolytic capacitor that
obviously has leaked some of its contents. The brown'ish stuff has run down its
terminal and crept across the board a couple of centimeters.
- At the top right corner of the amplifier board, one of the blue capacitors is
not really blue anylonger. More like brown'ish black, suggesting that it
would like to be checked.
- Just to the right of the brown'ish capacitor, a fuse holder
sits - empty - on a piece of pertinax just below the top chassis cross-bar.
Its holding clamps heavily oxidated and bent outwards, unable to hold a fuse.

Already a good evenings work lined up.
Wonderful !  😎

The power supply has its own chassis to the extreme left (as seen from behind).
A cable of wires run to a (valve-type) socket just to the right of the tuning
capacitor. This photo shows the above mentioned issues plus the power supply cable coming
down from a holding post at the underside of the cabinet top. Very service friendly.

Martin

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