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 Post subject: New to me Westinghouse H908PN9GP
PostPosted: Dec Thu 06, 2012 5:23 pm 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
I've wanted this radio for a long time and I finally found one on e-bay. I paid top dollar for it because I wanted it badly. My Dad had one in the 60's and 70's but I never knew what happened to it.

This radio is very sensitive and selective. It'll give my Grundig G5 a run for it's money! Not quite as good as the G5 but very close. Does anyone here have one and if so, what do you think about it? The dial is about 10Kc off on AM and FM is about as close as it gets.

Now I need a schematic just in case I need to get into it.
See pic.

Everyone have a great day!
Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Sat 08, 2012 7:27 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 173
Location: GREAT WHITE NORTH
Hi Bob57
it's listed in TSM-56
send me an email & I'll fwd a schem

djbilly2@gmail.com


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Sun 09, 2012 1:15 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4295
Location: Indianapolis, IN
Glad you found it---Always great when you find something you've searched for a long while !

What's the sound quality like ? Remember a couple "pocket" sets I had as a kid sounded pretty darn good for their size...

John


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Mon 10, 2012 6:01 pm 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Good morning all, and honda91, Yes the radio sounds surprisingly good. I did remember how good it worked and how sensitive it was but I didn't remember how selective it was. Maybe that's because back in the 70's and late 60's, the AM broadcast band wasn't as "full" as it is now.

Since I was a kid (55 years young now), and still today I love DXing the am broadcast band so sensitivity and selectivity are a must and this little radio is surprising.

Whatever info anyone may have on this I would appreciate it. I did take up DJBIllie on his schematic offer. I can't wait to take a look at it. Thank you DJBillie.

I am also looking for a radio that I had as a kid which I put as a want on the forums here which is a Motorola Motorola PT1DE. If anyone finds one that would be great!

All the best.


Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 11, 2012 5:11 pm 
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Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
DJ Billie, I don't understand "TSM-56" What am I missing?
I did send you an e-mail about the schematic.
Thanks, Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 11, 2012 9:59 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
~ Mitch ~


Last edited by PBPP on Jan Tue 10, 2017 6:49 am, edited 1 time in total.

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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Wed 12, 2012 12:02 am 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Mitch, Thank you very much. I remember you helped me with my Motorola 8x26E (I think that's the model). I hope I can return the favor sometime in the future.
Do you have this radio?
All the best, Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Wed 12, 2012 2:56 am 
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User avatar

Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
~ Mitch ~


Last edited by PBPP on Jan Tue 10, 2017 6:50 am, edited 1 time in total.

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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Mon 24, 2012 8:26 pm 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Hi all, I found a second one with a problem. It draws about 1.5 milli-amps when shut off. By looking at the schematic it could be 2 things, the on/off switch or a .04 cap from + to - between the battery and the on/off switch.
I don't remember values exactly now but with radio off, battery out, resistance across the battery terminal (on the radio) reads about 5K or 6K ohms. Like I said I don't remember exact values measured but ohms law basically matches the 1.5 milli-amps of current draw when shut off. I discovered that my good fluke has a blown fuse on it's milli=amp circuit so I had to use the 10 amp circuit which isn't all that great for measuring 1.5 milli-amps! I do have an old 5 dollar analogue meter that read 3 milli-amps. Anyway, this is all the same problem which I'm betting on the cap.
With the radio on, it works well. I'm gonna start with changing the cap and see what happens.

Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 25, 2012 5:51 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4295
Location: Indianapolis, IN
Hey Bob,

Just looked at schematic that Mitch posted & wonder why they put the .04 uF ( C42 ) on the battery side of the switch ? Hope a leaky cap is the problem... But, the switch actuator could be worn or cracked causing the switch contacts to barely touch when off & create a resistive connection... Let us know...

John


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 25, 2012 8:04 am 
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Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Yep I hope it's the cap. Much less work! Keep your fingers crossed for me.
The only reason I could think of for having that .04 cap in front of the switch is for circuit board design???
Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 25, 2012 6:38 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
~ Mitch ~


Last edited by PBPP on Jan Tue 10, 2017 6:51 am, edited 1 time in total.

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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Tue 25, 2012 8:42 pm 
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Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Mitch, The problem and measurements were the same before and after de-oxit. I'll get that close up pic in a day or so.
Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Thu 27, 2012 3:38 am 
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Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Problem solved! It was the .04 cap that was leaking. I went through more diagnostics B4 just changing parts and it led to the cap. Now I wonder what the purpose of that cap is exactly. It's obviously there to bypass some kind of AC whether it's RF or Audio but what the designer had in mind has got me curious. Since I have 2 of these radios I'm going to do some comparing since I have NOT replaced this .04 yet. If you haven't seen the schematic yet, it's one of the links in a post above.
Nice when it's easy!
Happy new year! Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Thu 27, 2012 4:29 am 
Member
User avatar

Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
~ Mitch ~


Last edited by PBPP on Jan Tue 10, 2017 6:53 am, edited 1 time in total.

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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Thu 27, 2012 6:48 pm 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
Mitch and others, Unsoldering it was going to be a PITA since the chassis was going to have to come out of the case so I diagnosed the problem and cut the cap out. Now there is no current draw when off and the radio works as it should but I will be replacing that cap when I get some time to put into it.

A friend brought up something else about why that cap might be there. Anytime a switch is turned off you get a spark whether or not it can be seen so do you think it may be there to bypass that possible spark???

Bob


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Dec Thu 27, 2012 9:06 pm 
Member
User avatar

Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
~ Mitch ~


Last edited by PBPP on Jan Tue 10, 2017 6:54 am, edited 1 time in total.

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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Jan Fri 06, 2017 2:48 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2855
Location: Virginia
Mitchi


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 Post subject: Re: New to me Westinghouse H908PN9GP
PostPosted: Jan Fri 06, 2017 6:47 pm 
Member

Joined: Jun Wed 01, 2011 6:19 pm
Posts: 97
Location: Sacramento, CA
PBPP wrote:
The .04 ufd capacitor will shunt nearly all 'noise' on the 9V source to ground.
This includes rf and sparks. But when opening the switch, (turning the set off),
it shouldn't make any difference in performance since you won't be able to hear it.
Having the capacitor in place protects the transistors from being damaged
as it will bypass most of these transient spikes to ground.

~ Mitch ~

I took the lazy way out and soldered in a new cap in a more convenient place. Electrically the same just physically different location.
I have not seen this cap in any of my other (shirt pocket) transistor radios.

Just for information, I have three of these and for what I have, they are the most sensitive and most selective at the same time (not always easy to achieve), as any other shirt pockets I have.

Happy New Year! Bob


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