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Old 2nd May 2018, 8:20 am   #21
Jac
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Default Re: Philips 563A restoration.

Hello David,

Very interesting.
I found in my 383A and 663A that almost all ECH35s were exhausted.
Is that also the case in your set?

The reason Philips changed the FW4/500 (in the 563A) to 2x GZ32 (in the 663A) is not clear to me. Perhaps the load was too severe for one FW4/500? Or the valve was no longer available?
GZ32 is somewhat comparable with FW4/500, although the FW4/500 seems to be able to handle a bit higher value load capacitor.

Attached a picture of the side of the relay in the 383A (the two chassis were separated for ease of handling).

Jac
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Old 2nd May 2018, 3:16 pm   #22
FERNSEH
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Default Re: Philips 563A restoration.

Jac wrote: "I found in my 383A and 663A that almost all ECH35s were exhausted.
Is that also the case in your set?"


We're lucky with this set, the ECH35 triode-hexodes in the timebase oscillators are serviceable. More good news, the line and frame oscillators are now working as they should. A very linear sawtooth waveform at the anode of the triode section of the frame oscillator valve. Line drive waveform not so good.
The frame oscillator is not of the blocking transformer type, it is, as is the line oscillator of the cathode coupled multivibrator type. The usual valve for this type of oscillator is a double-triode, but somehow Philips were successful in this chassis by employing radio receiver frequency changer valves. Did Mullard and Philips have double triodes available at the time the 563A was under development? The earliest Mullard double triodes were the types ECC31 thru to ECC35.

Later today I'll move on to the line and frame timebase output stages.

DFWB.
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Old 2nd May 2018, 9:27 pm   #23
Duke_Nukem
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Default Re: Philips 563A restoration.

R-Type.Org has the ECC31 as being introduced in 1942. However, I wonder if they had an awful lot of radio valves such as ECH35s surplus to requirements after the war ?

I wonder when this set was actually released ? It was shown at Radiolympia in '47, but shortages (of wood more than electrical stuff) meant many sets exhibited there didn't become available 'til well into '48. I don't recall seeing any announcements or adverts for the set, other than its mention in Wireless World's review of the '47 Radiolympia. Do the electrolytics (or anything else for that matter) have any date markings ?

TTFN,
Jon
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Old 2nd May 2018, 9:53 pm   #24
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Default Re: Philips 563A restoration.

Duke_Nukem wrote: "R-Type.Org has the ECC31 as being introduced in 1942. However, I wonder if they had an awful lot of radio valves such as ECH35s surplus to requirements after the war ?"

Hi Jon,
I think Philips was wise to use the ECH35 in the timebase oscillators.
The ECC31 is very similar to the American 6N7G which is in turn a rebased 6A6.
These old double-triodes are greedy for heater current, the 6A6 and 6N7G is 0.8amp and the ECC31 even worse @ 1amp.
The ECH35 takes a very frugal 0.225am and works very well in it's role as a timebase multi-vibrator. Valve info from the Radiomuseum.org

The frame output stage is working although the waveform at the anode of the EL33 is a bit strange. The line output stage is at present receiving attention.

DFWB.
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Old 4th May 2018, 12:52 pm   #25
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Default Re: Philips 563A restoration.

Turning my attention to the line output stage the EL38 was plugged in, sure enough after warming up there is a tiny spark present at the anode of the valve. But then bad things happened, the contacts of the HT supply relay started to vibrate, also the resistor in the HT negative return to the centre tap of the mains transformer secondary was getting very hot. Fortunately it is a huge vitreous enamelled thing and was capable of withstanding the temporary overload.
The cause of all this awfulness is the failure of one of the 16mfd HT reservoir capacitors. In fact all the can type wet electrolytic capacitors will need replacing. Suitable replacements are available from the BVWS shop.

DFWB.
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Old 13th Jul 2019, 9:48 pm   #26
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Default Philips 563A restoration restarted.

Follow about this set:

From post No.25:

"The cause of all this awfulness is the failure of one of the 16mfd HT reservoir capacitors. In fact all the can type wet electrolytic capacitors will need replacing."

The wet electrolytics need replacement. To maintain the original appearance of the chassis these will be rebuilt with new capacitors fitted in the old cans.
The attachment shows one of the cans receiving the treatment.

DFWB.
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Old 14th Jul 2019, 10:57 am   #27
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Default Re: Philips 563A restoration.

The power supply circuits in the model 563A.
As a directly heated HT rectifier valve is employed a relay S68 delays the introduction of an additional reservoir capacitor C113 until the set is fully warmed up. During the warm up period C112 (24mfd) serves as the reservoir capacitor.
C113 consists of two 16mfd 450V wet type electrolytic capacitors. both are faulty.

DFWB
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Old 15th Jul 2019, 5:44 pm   #28
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Default Re: Philips 563A restoration.

"C113 consists of two 16mfd 450V wet type electrolytic capacitors. both are faulty."
Good progress today. The two 16mfd electrolytics that form the switched reservoir capacitor C113 have been rebuilt. The other reservoir capacitor C112 (28mfd) was also found to be faulty and has also been rebuilt.
Main smoothing capacitor C131 (28mfd) has been tested and found to be perfect. It's not the original and was fitted sometime in the fifties.

DFWB.
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Old 15th Jul 2019, 6:33 pm   #29
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Default Re: Philips 563A restoration.

From post No 24: "The frame output stage is working although the waveform at the anode of the EL33 is a bit strange."

Electrolytic capacitor C127 (47mfd) found to be low capacity. This capacitor smooths the HT supplied to the frame timebase. Perhaps that's the reason for the strange waveforms in the frame output stage.

The HT for the line output stage is supplied direct from the reservoir capacitors C112 and C113. Hence the reason for the high capacitance. 16microfarads is the maximum value for the reservoir capacitor for the FW4-500 directly heated full-wave rectifier valve.

From rtype.org: http://www.r-type.org/exhib/aad0217.htm

DFWB.
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Old 15th Jul 2019, 6:35 pm   #30
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Default Re: Philips 563A restoration.

Good grief what an OTT power supply. Couldn't be anyone but Philips !

TTFN,
Jon
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Old 15th Jul 2019, 7:10 pm   #31
Jac
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Default Re: Philips 563A restoration.

Hello David,

The Philips sets of the late 40s always seems to give lots of restoration fun.
This looks to be no exception.

Looking forward to seeing a picture!

Jac
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Old 16th Jul 2019, 12:50 pm   #32
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Default Re: Philips 563A restoration.

Hello Jac,
The only other post-war TV sets that match the Philips 563A for complexity are the over engineered sets made by Sobell between 1947 to 1949. An example is the model T107.
DFWB.
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Old 16th Jul 2019, 7:56 pm   #33
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Default Re: Philips 563A restoration.

Re post #24. Duke Nukem wrote: "Do the electrolytics (or anything else for that matter) have any date markings?"

Date or production codes on the electrolytic capacitors in the Philips 563A.

DFWB.
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