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 Philips Transistor circa 1958
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 Return to top of page · Post #: 1 · Written at 9:56:24 PM on 24 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Pictures to be sent to Brad. Looking for a model number it and a chunk of the track have been chomped. That I am confident I can trace, however, the circuit would help with the batteries as those wires have been gobbled up as well. The cabinet did not escape either; It has a section of its plywood turned to charcoal.

This of course due to batteries & I have seen the bottom of a coffin set dissolved in a similar manner. The acid component has been neutralised & I will let in a new piece of wood. Battery holders might be redeemable?

Only help is 3W 800 35 on the lower board.

Philips Radio
Philips Radio


 
 Return to top of page · Post #: 2 · Written at 11:08:13 PM on 24 December 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5262

Transistor line-up?


 
 Return to top of page · Post #: 3 · Written at 6:41:16 AM on 25 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Transistor line up is part of the problem. I see an OC65 and I assume the metal jacketed ones are AC*** series. Most of the metal anything has varying damage and that includes the transistor ID. You may be able to see the pitting on the IF cans.? Albeit I was not focusing on them.

OP is clearly Push pull AC types mounted on a plate that is also an RF shield, The RF shield near the battery holders is eaten. It had the numbers on it. The number etched onto the PC board (as happened in some 60's car radios) is the only really solid clue.

As noted visible damage is substantial.

Marc


 
 Return to top of page · Post #: 4 · Written at 4:17:19 PM on 25 December 2018.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 320

Interesting, but waiting for pictures.
Do not think AC.... series transistors were around in 1958.
Have several very early Philips transistor radio’s in my collection, and can remember my Dad in 1958 stressed out deciding to buy the NEW Philips transistor radio or a Ferris valve portable with ferrite rod antenna.
He chose the Ferris which served us well, but then the cost of batteries!!!!
Hindsight is a wonderful thing.
JJ


 
 Return to top of page · Post #: 5 · Written at 8:26:31 PM on 25 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Scouting around I am getting the feeling that its an L4 series? They show the right "L"shape configuration for the printed circuit boards with a layout on them.Tracks are a bit obscure on those diagrams, but I have found ways around that in the past. It may be 1961

At this point it's assume nothing.

One thing about batteries over the years is the improved power to weight ratio: On the reverse of that with dry cells, I have stopped buying one brand. The Mexican ones are good but with the Chinese ones of the same brand, I have had several leak before they were even flat.Great way of supporting your opposition.


 
 Return to top of page · Post #: 6 · Written at 9:38:44 AM on 27 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Some luck a radio Type SA with exactly the same board. has materialised. It has has the battery problem but not to the same extent. It is not a source of parts its good to wreck not mine & now another to sort out. Looks like its only the battery holder?

I can now see that I was right with the missing track & that's irrelevant anyway, as this one's boards are mint.

However it looks like OC45 on the one I think an L4, has suffered too much Christmas spirit, as it is legless in two places. Apparently the replacement if I cannot find one NOS, or another scrap board is NTE102A & their not exactly cheap.

What possess people to have a funeral with burial at 2pm in summer when the temp will likely exceed 40? Glad they didn't choose cremation: He was an alcoholic.


 
 Return to top of page · Post #: 7 · Written at 11:20:31 AM on 27 December 2018.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 320

Nothing really special about a OC45.
There are lots of Russian germanium replacements, new.(cheap).
But if you wish to keep it original could probably find one for you.
Otherwise there are lots of front end transistors that would do in old wrecked Japanese radios.
JJ


 
 Return to top of page · Post #: 8 · Written at 4:25:28 PM on 27 December 2018.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 5502

Photos uploaded.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 9 · Written at 5:54:26 PM on 27 December 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5262

Scouting around I am getting the feeling that its an L4 series?

Yep: https://www.radiomuseum.org/r/philips_l4x00t.html


 
 Return to top of page · Post #: 10 · Written at 6:19:56 PM on 27 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Not much point keeping it original The battery holder I have doubt, is repairable & the metal holding the chassis & acting as a shield as well as the bolts are a write off. The battery holder is held in place by two pins (what pins).

It is preferable to replace Germanium with Germanium. So if some one has that might save hassle. One issue I have found in car radios is the failure of the Germanium Oscillator Transistors.

Marc


 
 Return to top of page · Post #: 11 · Written at 6:46:22 PM on 27 December 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5262

How attached is the owner to that particular model?

https://www.ebay.com.au/itm/382679516012


 
 Return to top of page · Post #: 12 · Written at 7:41:36 PM on 27 December 2018.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1043

It is actually a Transworld 405 All Transistor L4X05T.

https://www.radiomuseum.org/r/philips_all_transistor_l4x05t.html

The L4X00T was not sold in this country.


 
 Return to top of page · Post #: 13 · Written at 8:00:40 PM on 27 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Owners are seriously attached to them That is rather why it is a case of endevouring to make two out of two working rather than scrap one fix one. Assuming that the coils have not been destroyed.. one gets projects like that.

I also have a "Unikit" OK1 That wants me to see if can work a miracle on. I have mentioned it. The way is is designed & put together, leaves a lot to be desired. The valve is cactus & the wiring to every coil was broken. I have either to use the waveform generator & a CRO, or sort out the valve issue, to see if I have the coil phasing right.

Good to know what the set is.


 
 Return to top of page · Post #: 14 · Written at 8:23:30 PM on 27 December 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5262

The Dutch L4X entry provides photos of internals, a schematic and service notes.


 
 Return to top of page · Post #: 15 · Written at 8:24:37 PM on 28 December 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

I noted the set on Radio Museum: There seems to be some misleading stuff there if you try to download. I often wonder if its been hacked? The Malware program here just loves blocking things that pop up there.

A lot of that is on "Kevin Chants" website and the systems do not block it. I have actually sent a couple of things to him. After I realised that the only circuit that could be found was the one I drew.The warning that they are reverse engineered & what was modified & why, is declared.

There is every likelihood that this one came in via Italy.


 
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