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Old 13th Jun 2018, 8:53 pm   #1
Pilot Mariner
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Default Philips radio ID? Philips 170A

A mate of mine has found this old Philips radio in the loft of an old house he is working on. Can anyone ID it, save me from trawling through radiomuseum etc
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Old 13th Jun 2018, 9:03 pm   #2
Cobaltblue
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Default Re: Philips radio ID?

Philips 170A?

https://www.radiomuseum.org/r/philip...5_170_a15.html

Nice set

Cheers

Mike T
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Old 13th Jun 2018, 9:05 pm   #3
peter_scott
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Default Re: Philips radio ID?

I think it's a 170A.

https://www.radiomuseum.org/r/philip...5_170_a15.html

Peter



SNAP!
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Old 13th Jun 2018, 9:06 pm   #4
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Default Re: Philips radio ID?

Many thanks, sadly its missing the back, but otherwise complete.
Wonder how long it had been in the loft patiently waiting to be discovered

Mark

Last edited by Pilot Mariner; 13th Jun 2018 at 9:12 pm.
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Old 14th Jun 2018, 10:11 am   #5
Edward Huggins
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Default Re: Philips radio ID?

One of the best sounding AM radios ever made and with an excellent specification. Not the easiest to repair though.
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Old 14th Jun 2018, 12:05 pm   #6
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Default Re: Philips radio ID?

Very nice set, obviously it will need looking at before it's powered up but these Phillip sets seem to stand the test of time more than most, I think they must have used good quality components.
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Old 14th Jun 2018, 12:27 pm   #7
Philips210
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Default Re: Philips radio ID? Philips 170A

Hi

They're a very nice set. Mine is in the loft awaiting service. I have the back cover which I can take a few photos/measurements if required.
From memory, I believe the mains plug/socket arrangement is associated with the back cover so if the cover's missing then you'll also need to find the socket to fit the chassis mounted plug.

Regards
Symon.
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Old 14th Jun 2018, 3:03 pm   #8
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Default Re: Philips radio ID? Philips 170A

That would be good Symon if you can take a photo of the back when you get chance, then maybe I could fabricate one. There's a bundle of wires hanging out from the back which looks mains associated.

Mark
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Old 14th Jun 2018, 3:12 pm   #9
Sideband
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Default Re: Philips radio ID? Philips 170A

These sets have an RF amplifier (EF39) and will pull in stations where others fail. Excellent results across all wavebands.
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Old 14th Jun 2018, 4:13 pm   #10
Leon Crampin
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Default Re: Philips radio ID? Philips 170A

The big weakness with this set is an open circuit output transformer primary. There's a simple work around using a standard transformer and the remaining sections of the original - report back for more details if needed.

Leon.
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Old 14th Jun 2018, 5:38 pm   #11
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Default Re: Philips radio ID? Philips 170A

This was their first post-war set in the UK. The odd valve line up is partly to do with the non-availability of double diode triodes at the time (this type was not made for services use), hence the RF stage to make up the gain.

Not a hard set to get working, but lots of gain before the detector makes for touchy stability if anything is amiss. In particular, the metallised paint on the EF39s has to be in first class condition and properly bonded to the relevant pin or the whole thing just oscillates at its IF frequency and you get -20V (or more) of AGC bias, meaning that sensitivity effectively drops to zero. I fixed the last one by wrapping the EF39s in cooking foil with a loop of wire wrapped around between the 'hip' of the glass and the plastic base. This was then soldered externally to the pin on the base. It worked a treat, but I'm sure there are more elegant ways of doing it...
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Old 14th Jun 2018, 8:30 pm   #12
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Default Re: Philips radio ID? Philips 170A

Quote:
Originally Posted by Studio263 View Post
In particular, the metallised paint on the EF39s has to be in first class condition and properly bonded to the relevant pin or the whole thing just oscillates at its IF frequency and you get -20V (or more) of AGC bias, meaning that sensitivity effectively drops to zero. I fixed the last one by wrapping the EF39s in cooking foil with a loop of wire wrapped around between the 'hip' of the glass and the plastic base. This was then soldered externally to the pin on the base. It worked a treat, but I'm sure there are more elegant ways of doing it...
Maybe the solution at the end of this link can give some help:
http://www.glowbug.nl/radio/170A.html
Jard N.
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Old 14th Jun 2018, 8:55 pm   #13
Philips210
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Default Re: Philips radio ID? Philips 170A

Hi.

I've just taken a few pics of the back cover and chassis mains plug. My set is not in the best of condition and the cover shows signs of water damage plus it's heavily nicotine tar stained unfortunately. The cover is also a little warped but hopefully the pics will give you the scheme of things. When you're ready to make your cover I'll provide some dimensions. Something that could be done I suppose is to take it to the college print facility and get them to scan it on their A3 scanner. Else I could scan it in sections on my A4 scanner with reference markers so the combined images can be stitched together.

Note also there's a reinforcing angled plate at the top of the inside of the cover and there's a foil screening plate with a wire riveted to this.
The mains input socket, which is fixed to the cover, appears to be identical to the type fitted to the continental Philips V6U. The pics to appear over three posts. Hope this helps.

Regards,
Symon.
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Old 14th Jun 2018, 8:59 pm   #14
Philips210
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Default Re: Philips radio ID? Philips 170A

Five more pics of the 170A cover.

Symon.
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Old 14th Jun 2018, 9:03 pm   #15
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Default Re: Philips radio ID? Philips 170A

...and the last five pics.

Regards
Symon
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Old 15th Jun 2018, 10:41 am   #16
Pilot Mariner
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Default Re: Philips radio ID? Philips 170A

Thankyou very much for the pictures Symon and offering to scan it, sections would probably be OK but it looks quite a complex back. but a really nice looking set. I'm itching to start work on it to the extent of letting it jump the queue of many other sets still waiting restoration.

Mark
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Old 15th Jun 2018, 8:03 pm   #17
Philips210
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Default Re: Philips radio ID? Philips 170A

Hi Mark.

PM sent re back cover scans.

Regards,
Symon
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