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 Post subject: Amrad F-516
PostPosted: Sep Mon 06, 2021 8:36 pm 
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Hello, I'm wondering if someone can tell me where the two cans are in the parts list and in the diagram.

I removed all the capacitors except 4 small ones that we see in the photo and I count 15 in all.

And on some capacitors there is written 2x0.02yF, I can buy 1x 0.04yf instead.

There is nothing written on the canes and I would like to change them.

Thank you.



Serge :)


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 Post subject: Re: Amrad F-516
PostPosted: Sep Mon 06, 2021 11:14 pm 
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Two two electrolytic cans (canisters) on top of the chassis are part numbers 6 and 33

#6 12µF 300V
#33 16µF 250V

The capacitors (assigned numbers) shown on the bottom view diagram look a bit screwy to me!
http://www.nostalgiaair.org/Resources/067/M0001067.htm

They are already marked in pencil.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Mon 06, 2021 11:15 pm 
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If you mean the two cans inside the chassis.
They are part numbers 2 and 5

#2 is the antenna coil (large can)
#5 is the oscillator (small can)

...they are shown in the parts list - - and - - the bottom view diagram - - and - - on the schematic.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Mon 06, 2021 11:24 pm 
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yes the two can inside, thank you for the information


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 Post subject: Re: Amrad F-516
PostPosted: Sep Mon 06, 2021 11:42 pm 
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Why have you removed Five capacitors?
Remove one - - replace one... otherwise you will get lost.

Greg.


Edit: Capacitor MF - MMFD Conversion Chart
https://www.justradios.com/MFMMFD.html

Some of those little capacitors are duals.
Example: 7Z and 7Y are 0.02µF (microfarad)

0.02µF equals 20000pF
0.04µF equals 40000pF


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 07, 2021 12:54 am 
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I know I should have removed them one at a time, but I took several photos before removing them.

But I do not understand very well, the capacitor mark 2 x 0.02yF, I have to buy one of 0.02 yF?


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 07, 2021 1:52 am 
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If I'm not mistaken… the small capacitors with a clamp are dual capacitors, with the clamp being the "common" connection between them.

To be honest, you should verify (mark-off on the schematic) all components and their connections before replacing anything.

Also… all connecting wires should be labeled in the chassis with dozens of masking tape flags,
and marked-off on the schematic with colored highlighters.
wire "one" A1 at one end and A2 at the other end.
wire "two" B1 at one end and B2 at the other end.


Clamp connections shown below in blue for two capacitors.
Look at your original photos to confirm this.

For individual replacements...
7Y is a 20,000pF (picofarad) aka 0.02µF (microfarad) capacitor.
7Z is a 20,000pF (picofarad) aka 0.02µF (microfarad) capacitor.

Greg.
fyi... if they were dual capacitors with one lead at one end, and two leads at the other end, the single lead would be the "common" connection.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 07, 2021 3:30 am 
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photo taken before I removed almost everything


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 07, 2021 2:35 pm 
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Thank you for all the information



Serge :)


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 07, 2021 8:45 pm 
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fyi... Crosley model 516 is the same.
http://www.nostalgiaair.org/Resources/374/M0003374.htm

â–Ľ Old and new connections for your Dual paper capacitors that have or had a clamp.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 3:28 pm 
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Hello, I changed all the capacitors.
All the tubes light up, no smoke, the only sound I hear is a very weak and sweet Hummm.

Serge :)


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 4:38 pm 
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Rider 1937 • Amrad pages…
7-1 http://americanradiohistory.com/hd2/IDX ... e-0030.pdf
7-2 http://americanradiohistory.com/hd2/IDX ... e-0031.pdf
expected Voltages, all tube, all pins are shown.

------------

These linked videos will show all alignment and dial-tracking procedures.
→ https://antiqueradios.com/forums/viewto ... 1#p3128591

(not found with a google or youtube search)→ • Watch: Two part alignment procedure. 1936 Philco model 630B
https://www.youtube.com/watch?v=u7Humidss4I
https://www.youtube.com/watch?v=TnlPvf46eOs

Image
• http://www.rfcafe.com/references/popular-electronics/how-to-align-receivers-oct-1954-popular-electronics.htm

------------

If an accurate 1000 ohms per volt meter is not available, a modern high impedance analog or digital voltmeter can be used with appropriate shunt resistors in parallel with the input to simulate proper loading.

The following resistor values should be used:
10 volt scale use 10K
50 volt scale use 51K
250 volt scale use 250K
All resistors are 1/2 watt 5% carbon composition.
â–˛ Daniel Schoo.
Image
..â–˛ image: Bruce aka bhamham.

The shunt resistor is placed across your multimeter's input posts, or across the probe tips.

------------

"If an accurate 1000 ohms per volt meter is not available a modern high impedance analog or digital voltmeter can be used with appropriate shunt resistors in parallel with the input to simulate proper loading. The following resistor values should be used: 10 volt scale use 10K, 50 volt scale use 51K, 250 volt scale use 250K. All resistors are 1/2 watt 5% carbon composition".
â–˛ Dan Schoo. http://formicapeak.com/~jimc/hickoktest.html


Greg.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 5:00 pm 
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I will try this, but the radio before I changed the capacitor was working fine.

Thank you


Serge :)


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 6:58 pm 
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Try your best to verify each and every replacement on the schematic.

Here is the real-world view of the tube sockets.
Bottom view of sockets - - - when viewed from below.

I have transferred their pin numbers onto the schematic.
Count tube pin numbers clockwise from the "key".
Follow their pathways into the circuit and identify the components that they connect to.

click image to enlarge.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 8:12 pm 
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I checked all the capacitor connections and it had the wrong value and was badly connected

Now the radio works fine

Next time I will change the capacitors one at a time not all 8 at once

Thank you.

Serge :)


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 Post subject: Re: Amrad F-516
PostPosted: Sep Tue 14, 2021 9:57 pm 
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Very good Serge, glad that you got her going.
Don't worry too much about making mistakes, I've had my fair share. lol

Greg.


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 Post subject: Re: Amrad F-516
PostPosted: Sep Thu 16, 2021 12:30 am 
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Location: Lexington, KY USA
Be sure that each replacement for the double capacitors is wired as seen on the schematic.

It is common to have trouble with getting these wired up correctly. For instance, a popular mistake is to connect both capacitors for part 11 to ground, so no signal gets to the output tube grid. Only 11Z goes to ground. 11Y is supposed to connect the plate of the first audio tube to the grid of the audio output. Crosley may have connected the strap of dual capacitor 11 to the triode plate. The strap is not always ground.

If this is not the reason for the set being dead, it is surely some other mistake. A mis-wire, wrong part, or damage done while working under the chassis. A systematic inspection should find it. Basic troubleshooting can help narrow down where the trouble is located. Remember that the possibility exists that there is more than one error.

Ted

Sorry, I seem to have missed a couple of prior posts! So, never mind...


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 Post subject: Re: Amrad F-516
PostPosted: Sep Fri 17, 2021 4:23 pm 
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Location: Hamilton, Ohio
Glad you got it going, one thing you might want to do is replace that "candohm" power resister (part 21 Y and Z on the schematic) before it shorts out. It appears someone in the past already jumped an open section with a replacement resister, but it would be wise in my opinion to set a terminal board and replace both sections for reliable operation.

_________________
"You can't judge a radio by it's unrestored appearance" - Some Wise Somebody


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