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 Post subject: Aria model 171 schematic needed-Found
PostPosted: Mar Sun 10, 2013 12:36 am 
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Joined: Jul Tue 18, 2006 5:23 am
Posts: 11832
Location: Roseville,Ca
Supposedly built by Detrola but I can't find a listing for the schematic.
Thanks,Phil

Looks like this;

http://www.radioatticarchives.com/radio.htm?radio=10353

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 Post subject: Re: Aria model 171 schematic needed
PostPosted: Mar Sun 10, 2013 1:17 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 27993
Location: Detroit, MI USA
That's not one of the Aria models which was built by Detrola.

In the years before WW2, Aria was built by several of the independents (likely the lowest bidder) including Detrola. After WW2, Detrola owned the brand name.

Sentinel would be the most likely candidate for this model based on the dial, but there are others including Continental/RPC/Admiral, and other Chicago-based independents.

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 Post subject: Re: Aria model 171 schematic needed
PostPosted: Mar Sun 10, 2013 1:21 am 
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Joined: Jul Tue 18, 2006 5:23 am
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Location: Roseville,Ca
Bingo!

http://www.radioatticarchives.com/radio.htm?radio=8355

Now,I can't remember the work around for a bias cell-high value resistor and a cap I think?
Phil

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 Post subject: Re: Aria model 171 schematic needed
PostPosted: Mar Sun 10, 2013 1:23 am 
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Posts: 27993
Location: Detroit, MI USA
A watch battery or similar small cell in the original shell works, but a resistor connected in its place is fine too.

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 Post subject: Re: Aria model 171 schematic needed
PostPosted: Mar Sun 10, 2013 1:57 am 
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Joined: Jul Tue 18, 2006 5:23 am
Posts: 11832
Location: Roseville,Ca
Well it looks like the 52ae but the schematic doesn't match,however this does,a 72ae;

http://www.nostalgiaair.org/PagesByMode ... 018270.pdf

I used a AAA battery,positive to ground,neg 1.5 volts to the grid of the 75 and I'm picking up a station around 650 AM loud and clear-pretty good considering all the caps are original except the e-caps and I haven't even tested the tubes yet! :lol:
I guess I'll get to work after dinner,firing up the grill for the 1ST season opener BBQ-it's 75 today and nice and sunny and warm[Sorry John!].
Phil

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 Post subject: Re: Aria model 171 schematic needed
PostPosted: Mar Sun 10, 2013 5:16 am 
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Joined: Jul Tue 18, 2006 5:23 am
Posts: 11832
Location: Roseville,Ca
Boy did this get interesting!
The more I replaced the worse it got! :oops:
AND the B+ was slowly dropping!
Turned out to be as I replaced more shorted caps the B+ rose up shorting more old caps not replaced yet!

It went down to the absolute last cap before it started playing well!

Same thing on a model 90 Philco I did this morning-not a peep until the last cap was replaced!

Discovered a few other things along the way-a trimmer soldered to ground on one end,other end connected to nothing,right next to that was a short wire on the bandswitch,cut off and wrapped around another bandswitch wire.

And ,below a coil,a ground wire clipped off and hanging in space,right next to a vacant terminal on the coil,and under the coil a .1 cap cut off at the + end,hanging in space right next to another vacant coil terminal!

Yep,you guessed it-another WW2 disabled shortwave radio!
Interesting repair to say the least!

Phil

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