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 Post subject: 1935 Crosley 555 Restoration Question
PostPosted: Mar Thu 29, 2012 10:54 pm 
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Location: Santa Maria Ca
Hi all,
Picked this nice radio up on Ebay!! Have a couple of questions. Is the Big orange tube cap an Electrolytic it reads 40 mfd @ 400 vdc has a positive side on it? Also is the small tube that is circled in black in the picture a capacitor? and should it be changed ? It reads .02 @160 volts?(circled in black) Where does this busted wire on the speaker connect to?

Thanks for the help in advance

John


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Last edited by radiojohn on Mar Thu 29, 2012 11:45 pm, edited 1 time in total.
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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Thu 29, 2012 11:25 pm 
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It would be an idea to get the circuit & chase it down. On face value I would consider it to be an Oil filled capacitor, many of these had outside foil and that connected to the earthy side. The band was on the end to be earthed. From my experience these are just as unreliable as the normal paper cap. The fact that it tests 0.02 is not a guarantee that when HV is applied to it, it will not leak like a sieve.

The circiut /schematic will confirm if the speaker is of the electrodynamic or permanent magnet type; However this looks like the wire to the bobbin / field of an electrodynamic speaker.

Do not turn it on until that is confirmed. One of its wires will end up on the rectifier, the other just might end up supplying the screen of an output Pentode ( Not familar with model). I see the base of a "wet electrolytic" another good reason to not turn it on; Should it be wired in.

Marc


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Thu 29, 2012 11:39 pm 
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radiojohn wrote:
Is the Big orange tube cap an Electrolytic it has a positive side on it?
Yes it is an electrolytic and quite probably (90%+ liklihood) it needs to be changed.
radiojohn wrote:
Is this small tube a capacitor and does it need to be changed? It reads .02 @160 volts?(circled in black)
Reads as in that is what it measured, or reads as in that is what is written on it? If that is what is written on it, it is probably capacitor 18 and is not an electrolytic. Might be easier to tell if you can identify what it is connected to. By the way here is the schematic. http://www.nostalgiaair.org/PagesByMode ... 003424.pdf
radiojohn wrote:
Where does this busted wire on the speaker connect to?
It looks suspiciously like the field coil winding of the speaker. The fact that it is already cut loose doesn't bode well for the speaker. A resistance test between that wire and the other wire going to the speaker is probably in order. The field coil is part of the power supply filtering as well as the electromagnet for the speaker. So if that is cut loose nothing is going to work. It is possible that was cut loose because a bad filter capacitor burned out the field coil and someone got far enough to see it was blown and decided it was time to sell it on ebay.

I compared the underside photo with the chassis drawing and realize that it looks like someone paralleled the original failed power supply cap with that big orange one but left the original connected. They we "curing" the hum but in a way that should not have been done if they really left the original connected (hard to tell in the picture). if they did leave the original connected this is another bad sign. The original probably finally shorted out and took the field coil with it.

Curtis Eickerman

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 12:15 am 
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Hi Curtis,
I tested the resistance and got 130 on my meter is that good or bad?Will do more tests!! Will probably have more questions? If the speaker coil is blown how hard is it to find the Speaker and the coil?


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 12:47 am 
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radiojohn wrote:
I tested the resistance and got 130 on my meter is that good or bad?
That may be good news. I don't know what it should be, but the fact that it's not infinite is a step in the right direction.

You will see in the schematic that one end of the speaker field coil hooks to that first electrolytic capacitor (8) and the other end of the speaker field coil hooks to the other electrolytic capacitor (9). I wouldn't worry about hooking anything up though until you have addressed the electrolytic capacitors (both cans and that big orange job).

Curtis Eickerman

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 3:09 am 
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I have a radio with the same type wire hanging off of it and it works fine seems it does nothing you might be fine

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 3:25 am 
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magicclocks wrote:
I have a radio with the same type wire hanging off of it and it works fine seems it does nothing you might be fine
So are there actually more than 2 wires coming out of that field coil with one that isn't connected?

Also, I can't tell from his picture what is going on with that wire that seems to be going to the top of what looks like the electrolytic can. Unfortunately the documentation drawings don't show any of that and the picture is just from the wrong angle.

Edited: OK it looks like there really are 3 wires and an odd electrolytic capacitor with a terminal at the top (and the bottom?). The wire in orange below seems to be going to one cap. The Green wire may be going down through the chassis eventually to the other cap. This leaves the Blue wire which is heaven only knows what.
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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 5:13 am 
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Thanks for all the replys Curtis and Magicclocks!! I looked under the chassis again and it appears that whoever tried to fix this connected all the cans up top to the big orange electrolytic on the bottom!! This is gonna be a fun one Lol!!A third can was strapped to the top!!Black wire in back of can connects to Orange electrolytic. Wire that is marked in green is connected to chassis underneath with a bunch of other wires. This is fixable just have to follow schematic very carefully. also orange cap is soldered to circled part on two green wires!! This is gonna be fun!!

Will keep you posted
John


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 1:26 pm 
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That speaker may be one that is used in other sets? It is not rare to have a tapping in the feild and it may be a case that this one does not use it.

There may have been some lazy servicing. The cans may be on the cathodes or B+, but there were those slackers who expediently hooked the new electrolytic cap up parallel to the old one. Too bad if the old one decided to go short or "bang". Proceed with caution.

Marc


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 2:57 pm 
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Hi Marcc,
I plan on taking one step at a time!! Im going to mark every wire and every part ,and take lots of pictures. Going to follow every wire on schematic. This is a challange and thats what I like!! It would be boring if it was just a typical changing of capacitors!! I will be very careful. Thank you all for your great advice!! I love being on this forum and learning about radios from all you professionals out there!! Ive learned alot since I have been on here and will continue to learn!!I will keep everyone up to date as the restoration goes along.

Thanks again,
John


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 4:07 pm 
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radiojohn wrote:
Going to follow every wire on schematic.
That's a really really good idea especially when you are in the learning process. When you are done you will be very good at reading a schematic and finding things in almost any vintage radio.

Curtis Eickerman

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 9:38 pm 
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Have a question on some of the regular capacitors in this radio!! What would you replace these values with?

0.00017 mfd 200 volts
0.006 mfd 200 volts

john


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 10:03 pm 
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0.00017 mfd 200 volts <-- probably easiest to get as a 180 pF Mica cap at 300 V
0.006 mfd 200 volts <-- you can get this (6000 pF) as a polyester film cap at 200 V from Digikey, but they don't list the price

Neither would actually be critical for value, but I would make sure you get the voltage rating. The polyester film caps I saw at 180 pF were only rated at 100V although someone else might have them.

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 10:20 pm 
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To replace most of the papers you just buy 630VDC which are the most common HV. This keeps the inventory down. Axial is best fit albeit the red greencap can be handy.

0.006 would become 0.0056 (562)
0.05 would become 0.047 (473)
Under the newere system

0.00017 is the realm of Ceramic & Silver Mica. The Mica caps here are normally reliable with few faiures. Micamold & a few others in your part of the world are not. You may need to parallel 0.00015, athough you have suppliers with a better range. While there are areas that you will get away with 50V type ceramics. It is better to get the 500V type.

If the set runs 250V B+ rail with a filament rectifier. Take note of the original caps & I will not use filters below 500V in that situation as the start up surge will "punch through" lesser caps.

Replace all paper & electrolytics in the set minimum and check resistors as you go. This is the time to replace the duds. Not later when they cause rework, by causing grief & frustration, when the set fails to work properly & you then have to go find the dud/s.

Marc


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 11:14 pm 
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Im pretty sure I can find these values at Justradios or radiodaze. Guess ill have to go shopping!!In place of the 0.0006 could I substitute a .0068 @630 volts?


Thanks again,
John


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Fri 30, 2012 11:36 pm 
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radiojohn wrote:
In place of the 0.0006 could I substitute a .0068 @630 volts?
I think you typed one too many zeros in the first one, but otherwise yes.

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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Sat 31, 2012 3:22 am 
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I cross refferenced 0.0006 back to the circuit there is a decimal error? However, it is unlikely that you will find the value expressed that way. The nearest value will be 0.00056 and will be expressed in Pico Farads, the value of that original is 600pF (a value close to what I have seen on delated AGC)

There are two 0.006 (6000pF) marked on the parts list 0.0056 (562) is the nearest. There is a 0. 00017 (0.00015 150pF) listed 170pF. and look like they are part of a double cap. As one is on B+ you may as well buy all HV types.

Marc


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Sat 31, 2012 6:32 pm 
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Yep I did put one to many 0 in the cap!! I going to replace everything with 630 volt caps. I also found a small electrolytic rated @ 12 mmfd 25 volts. What would you replace this with?As far as the 0.006 cap im going to replace it with a 0.0068 @630 volts.


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Mar Sat 31, 2012 7:32 pm 
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radiojohn, hi. It appears there are three electrolitics in that set C 8, 9, 10 (35mf, 40mf, 12mf respectively). I dont think a 12[u]m[u]mf was correct. Intresting enough, the manufacturer used two single cans (35, 40) mounted on chassis and one tubular (12) electrolytic under chassis rathar than have one dual cap (40, 12) and save space of tubular. All the cans are negative ground as is the tubular so there would be no problem with polarity. PL


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 Post subject: Re: 1935 Crosley 555 Restoration Question
PostPosted: Apr Sun 01, 2012 1:59 am 
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I would prefer 0.0056 as rounded off that is 0.006, not ,007.

The nearest on the schematic I see to 12uuF is 12Z at 17uuF which is 17pF and as it is on the plate circuit it needs to be 500V or better Silver Mica of Ceramic and will not be an electrolytic. Use 15pF or parallel 2 that add up to 15 if you change it.

Marc


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