Hi, I am looking for a cct for a Philips 178E radio- gram from the 1950's. It has two chasis, one for the power supply and treble amplifier with valves 5V4G, 6M5 and 6BD7 and a second chasis with valves 6AN7, EF86, 12AT7, EM34, 6M5 and 6M5.

This is a mono unit with a 12 inch speaker and 2 x 5 inch treble speakers.

Have so far replaced the large electros and am examining the smaller caps for failures.

Onetrack

Hi, Schematic should be in your inbox later this morning.

Cheers, Graham...

That is wonderful Graham, thanks. Recieved and printed OK.

Do you know what is the meening of the "A" and "E" letters that folows the model number?

I note that the Garard 3 speed autochanger sterio turntable in this unit is not the original equipment as I suspected on first inspection.

Many thanks, "Young" Les F

Hi Les,

Not sure why Philips used suffix letters after their model number. A number of manufactures used this method to note that there was a component change. This was a common occurence following the war when components were in short supply and substitutes were made.(Mostly a valve).

Cheers, Graham...

I would not bother testing the rest. If it has paper capacitors, just be rid of them and the electrolytics.

It is also an idea to check resistors as you go. Expect error with most resistors in circiut , but if you have them out of circuit whilst changing caps. That is the time to check them & replace if out of spec.

The only realistic way of check ing HV paper caps is with a megger ( Insulation tester), at the rated (or as close as ) Voltage of the cap.

Marc