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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 1:01 pm 
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Posts: 4025
Location: A0E 1K0 NL Canada
I think I have problem found the 2 nd RF tube has only 1 dcv plate voltage and the power feeds from 1st RF coiul that is shorted so how many ohms of resistance should that coil have ? And can I use a resistor to bypass thanks.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 2:26 pm 
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Location: Mountains of Mourne. Ireland.
Bakelite Block Capacitors shown in Blue.
Find their part numbers here→
Parts list: https://www.dropbox.com/s/w13o04zigok23 ... s.pdf?dl=1

Look up (Find) their part number specifications and Lugs here.
http://web.archive.org/web/201603242327 ... lokcap.htm
Image
Metal cased (Paper) Capacitors shown in Red.
Find their part numbers here→
Parts list: https://www.dropbox.com/s/w13o04zigok23 ... s.pdf?dl=1

Look up (Find) their part number specifications here.
http://web.archive.org/web/201604050107 ... talcap.htm

..........................

Two examples:
Blue 5 = By-Pass Capacitor .05μF (Mfd) Part number 3615-M Bakelite Block Capacitor.
Red 13 = By-Pass Capacitor .5μF (Mfd) Part number 3583 Metal Case Capacitor.


Chassis "Photo" (Rider's) http://americanradiohistory.com/hd2/IDX ... 020%20a%22
for this
Schematic: http://web.archive.org/web/201604240523 ... es/20b.jpg
and this
Parts list: https://www.dropbox.com/s/w13o04zigok23 ... s.pdf?dl=1

Additional Philco component data at bottom of the above specifications pages.


Greg.


Edit: image updated.


Last edited by egg on Apr Sun 01, 2018 2:47 am, edited 1 time in total.

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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 2:30 pm 
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Location: A0E 1K0 NL Canada
Perfect and thanks , so getting back to question about plate voltage on 2nd rf tube how can I bypass coil to get that thanks.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 3:46 pm 
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Location: Mountains of Mourne. Ireland.
Have you replaced schematic reference number 8 Bakelite Block
By-Pass Capacitor .05μF (microfarad) and Resistor 250Ω combined.
Part number: 3615-K
Image
BAKELITE   BLOCK   REBUILDING
https://web.archive.org/web/20170227112 ... pbuild.htm

Greg.


Edit: image updated.


Last edited by egg on Apr Sun 01, 2018 1:22 pm, edited 1 time in total.

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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 5:35 pm 
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Location: A0E 1K0 NL Canada
Not yet so when I do both cap and resistor join together has lug 5 and each other go to lug 3 and 8 correct.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 6:02 pm 
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Location: A0E 1K0 NL Canada
HERE IS a picture of by pass cap 8 that shows some wires cut from it and also shows three wires joined together in front of it
one wire goes to 1st af coil
next to 1st rf coil
the other to speaker plug


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 6:10 pm 
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picture


Attachments:
DSC00280.JPG
DSC00280.JPG [ 140.65 KiB | Viewed 3712 times ]
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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 8:37 pm 
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Location: Mountains of Mourne. Ireland.
Send me three or four large jpg photos of the whole chassis from slightly different angles.
Just like this→ http://a4.pbase.com/o10/56/215056/1/166 ... titled.png

Send me your email address via PM (private message).
Greg.


Edit: image link updated.


Last edited by egg on Apr Sun 01, 2018 1:23 pm, edited 1 time in total.

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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 8:50 pm 
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Location: A0E 1K0 NL Canada
How do you want the picture because I cannot post any larger.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 9:36 pm 
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Fill the frame with the whole chassis and send photos as they come, straight-out-of the camera.
Don't resize. Add each image as an attachment to the email.

Did you get my email address?
Greg.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Aug Thu 31, 2017 9:48 pm 
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Yes I sent 4 pictures


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 12:33 pm 
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Wondering how to replace metal can no 14 it is a .25 two section so does that mean the two wires are a .25 lead each and the other side of each cap goes to chassis ground thanks.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 12:33 pm 
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Wondering how to replace metal can no 14 it is a .25 two section so does that mean the two wires are a .25 lead each and the other side of each cap goes to chassis ground thanks.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 1:04 pm 
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Location: Annapolis, MD
spsquires wrote:
Wondering how to replace metal can no 14 it is a .25 two section so does that mean the two wires are a .25 lead each and the other side of each cap goes to chassis ground thanks.

What does the schematic show?

The most common construction of these cans is to have the ground connection made internally....then the connection to chassis is made when it is mounted. Sometimes a "ground" wire is brought out. Regardless, you have to make it functionally match the schematic.

_________________
-Mark
"Voltage is fun to watch, but it's CURRENT that does the work."


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 1:06 pm 
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If I was sure of what the schematic showed I would not of needed to ask this question.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 2:07 pm 
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Location: Mountains of Mourne. Ireland.
Yes, part 14 (3557) is two paper .25μF capacitors.
Image
The original manufacturer's test voltage for this metal case capacitor was 1200V
Use 600/630 Volt here and elsewhere in your radio.

You can connect two leads to the metal case if you wish, the other two as shown in the schematic above. use heat-shrink tubing (Spaghetti).

Sal's got 630V Axial Film Capacitors here
http://tuberadios.com/capacitors/
maybe you've got your own supplier in Newfoundland.

Image

Greg.


Edit: You need to replace the five Bakelite blocks, and the filter caps.
Hopefully Mark can keep pokin' you in the right direction, I'm kinda busy.


Edit: image updated.


Last edited by egg on Apr Sun 01, 2018 1:25 pm, edited 1 time in total.

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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 2:12 pm 
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spsquires wrote:
If I was sure of what the schematic showed I would not of needed to ask this question.

I think it would help you to tell us what you are looking at..and what exactly is confusing. I see item 14 in two places on the schematic---- both with one end going to chassis ground.

As an aside, this might illustrate why it's a good idea to restuff these things. The circuit could depend on the AC currents in those caps going to the same point.

_________________
-Mark
"Voltage is fun to watch, but it's CURRENT that does the work."


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Fri 01, 2017 6:33 pm 
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Location: A0E 1K0 NL Canada
Thanks to everyone who helped and now the radio is all done.


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Tue 05, 2017 4:35 pm 
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spsquires wrote:
Thanks to everyone who helped and now the radio is all done.

Congratulations!
We'd like to hear how you did things.....in particular, did you restuff the capacitor cans?

Please post some pictures of the finished product.

_________________
-Mark
"Voltage is fun to watch, but it's CURRENT that does the work."


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 Post subject: Re: Philco 20 baby grand
PostPosted: Sep Wed 06, 2017 1:14 am 
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Location: Mountains of Mourne. Ireland.
Bakelite capacitors (five) used in Philco models 20, 20A and 21

Image

Image

Image

Image

Image

Recommended replacement procedure by Gary Breaux.
http://itsmegfb.tripod.com/id16.html

Greg.

oh... all capacitors shown above are 600V :)


Edit: images updated.


Last edited by egg on Apr Sun 01, 2018 1:43 pm, edited 1 time in total.

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