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Old 7th October 2003, 01:51 PM   #1
LaZarus is offline LaZarus  Netherlands
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Default old philips 720 amp

I have just aquired an old Philips 720, 2 x 30 watt class a reciever, for free. Does anyone have a schematic or other info about this amplifier? I want to use just the class a amps (which are quite good I've been told) and get rid of the preamp and tuner.

The problem is that with this mess inside (really not neat compared to my quad 405) I can't clearly see which cables come from the preamp.
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Old 7th October 2003, 02:35 PM   #2
Netlist is offline Netlist  Belgium
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Default Vr720?

There should be a more complete number on the backside of the amp.
Could you have a look at that? Or is it this one: http://www.geocities.com/philipsmuseum/1974side-09.jpg ?
Copy and paste the link.

/Hugo
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Old 7th October 2003, 02:58 PM   #3
LaZarus is offline LaZarus  Netherlands
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I should have given the outside a better look I guess. It's the 22RH720/00z. Btw, the above link doesn't work...
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Old 7th October 2003, 03:24 PM   #4
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by LaZarus
It's the 22RH720/00z. Btw, the above link doesn't work...
I don't have the schematics but with the info you provided someone else might jump in.
The link works but you have to copy it and open it in a new browser window.

Greetings

/Hugo
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Old 14th April 2007, 01:57 AM   #5
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Hi Guys

About European Vintage .

I have finished restoring a Philips tuner from the 70 .

After cleaning, realigning and doing some mods , I am really amazed by is performance , specially in DX reception.

Here are some pics.

Cheers
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Old 14th April 2007, 01:58 AM   #6
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Another pic...
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Old 14th April 2007, 07:25 PM   #7
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Default I would be happy to see that schematic...i remember it impressed me very well when i


visited a friend in 1975.

FM receptions was very good...in those early days FM stations worked different from our present days.... sound was nice, no compressors, only some limiters were used.... hi quality of sound...not that awfull noise we have today.... sound to torture us.

Sound was flat, not compressed or expanded, no bass boost or treble boost...no audibility compensations....flat...from 40 to 15000 hertz really flat.

That one sounded nice, was a receiver, not only tuner, had amplifiers inside...and speaker was simple...just one Philips driver, a single speaker to each channel

I would be happy to take a look at this schematic.

I hope someone have it, to attach that precious thing here, to us.

Sound was warm, present in voices range and defined into high frequencies...i remember was playing Star Dust, i cannot remember the music sonics, but i can remember my feelings.... i felt good, confortable and dreaming beeing waken up, was a good time with beans made with curry and beer.... we were talking about our girls friends...they were friends....sound is connected to feelings, to friendship, to love and passion.... those days a brazilian guy made the music "feelings", in English....Morris Albert...ahahaha...Maurício Alberto.....Brasilian with hot blood and Samba in his feet and heart.

For sure, that delicious sonics came from a bootstrapped Philips design....and from Holland!

regards,

Carlos
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Old 14th April 2007, 08:55 PM   #8
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This one is even older (end of the sixties ), family heritage ...

The stereo decoder even use the old European germanium transistors AC 126...

However , the radiofrequency performance is not as good as the model in the first post...
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Old 14th April 2007, 10:56 PM   #9
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Default Re: I would be happy to see that schematic...i remember it impressed me very well when i

Quote:
Originally posted by destroyer X


I would be happy to take a look at this schematic.
So...be happy!!
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Old 14th April 2007, 10:57 PM   #10
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Second part...
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