Sears silvertone question
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
I have an Sears silvertone console with wire recorder and phono. Model 101-831-A.
After recapping the receiver section and changing out of tolerance resistors. I powered it up on the bench.
It plays on both am & FM. My question is: How much current draw should it have on the amp meter in series with the power line cord? It is reading btwn. 850mA & 900mA on the the amp. gauge. The line voltage is set to 117 V.
This is a 12 tube unit with the following tubes
2--7C7s
2--7W7s
2--7C5s
1--7A6
1--7C6
1--7N7
1--7F8
1--6AG5
1--5U4G
Help is greatly appreciated. Thanks
(This post was last modified: 05-07-2016, 02:38 PM by KCMike.
Edit Reason: Add info
)
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
Does the unit have a wattage rating?
Divide the wattage rating by 117V, see if it is .9.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Yes I found it inside the cabinet-- 215 watts. I came up with 1.837 Amps so I guess it is okay? The wire recorder is also the amplifier in this unit and I currently have it apart for repairs. would that explain the lower rating I'm getting?
Posts: 16,476
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Any today's computer is a power hog compared to that.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
This is true. Its just that most of the radios I've done has drawn about anywhere btwn. 300mA and 750mA. I only had it on about 15 minutes and the power transformer was barely warm . So I wanted to check with some of you guys before I
unintentionally did damage.
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
(05-07-2016, 03:44 PM)KCMike Wrote: Yes I found it inside the cabinet-- 215 watts. I came up with 1.837 Amps so I guess it is okay? The wire recorder is also the amplifier in this unit and I currently have it apart for repairs. would that explain the lower rating I'm getting?
Yes. You would have to run all of the devices at the same time to come up to the rated wattage. Sounds like you are about right.
Now if you want to be safe you can check the plate dissipation on the driver and output tubes against the RCA spec. These are the places where a bad cap or wrong screen voltage can make a real difference but you'll see it in the plate dissipation or voltage on the pins.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Thank you. I'm going to do alignment on it tomorrow and will get the tube specs and check that first. I did replace all the caps and there was plenty of them. 20 I think.
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Took some voltage readings on the rectifier tube today and stopped after getting these readings.
pin 8 & 2 307 volts DC schem. calls for 375V
pin 4 & 6 284 volts AC Schem has no volt rating on 2 & 4 pin. this is the secondary of the switch side of transformer.
I don't know if the wire recorder / amplifier has to be in the circuit or not for correct volt readings. On schematic you see that amplifier has its own rectifier. I'm concerned about the high AC readings and what I should check.
Here is the schematic of the radio and amplifier kind of blurry but you can see the pin out of the 5U4G tube.
Any ideas what I should check next? Thanks
https://www.dropbox.com/home/silvertone%...ematic.pdf
Posts: 7,295
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
< 307 volts DC schem. calls for 375V
Could have a weak 5U4. See it in tv's a lot.
If you measure from p4 to p6 on the 5U4 should see about 800vac.
Terry
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Thanks Terry. I was measuring the 5U4G tube 4&6 pin to chassis. I will test the tube again, it did show good when I tested it about 3 weeks ago when first started on this project. I don't remember the exact readings. I also have other 5U4Gs I can try. I did get the voltage readings on the out put tubes and the were within 5 volts of schem. using a fluke multi range DMM.
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Posts: 2,573
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
kcmike
nice job I like it  
sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Thanks Sam. Now to get some strong backs to move it upstairs to the den. 
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
(11-15-2016, 09:22 PM)KCMike Wrote: Thanks Sam. Now to get some strong backs to move it upstairs to the den.
It is nice that somebody is saving these. Their size limits most of us.
And, to that point, some of my display is upstairs. I have to assemble the radio on-site rather than try to get the whole thing up the steps.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 3
Threads: 0
Joined: Aug 2017
City: Dallas, TX
Recently I bought one of these Silvertone consoles at an auction close out. Did you ever find a schematic?
Users browsing this thread:
|
|
Recent Posts
|
|
Need to purchase some accessories for restoration of my Old Philco Radio
|
| Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM |
|
First Radio restoration
|
| Hi Tubeman,
Welcome to the Philco Phorum. Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM |
|
First Radio restoration
|
| You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM |
|
Zenith H725
|
| Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately.
More ...EdHolland — 10:18 AM |
|
Graphics for majestic 1050 dial glass.
|
| Murf;
I found this thread on the ARF, the first photo has a pretty good view of the dial glass.
Regards
ArranArran — 01:12 AM |
|
Zenith H725
|
| hello Ed,
how about that speacial tape used for ducting it's like foil or how about thin piece of
aluminum roof flash...radiorich — 12:19 AM |
|
Zenith H725
|
| Ed;
One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM |
|
Zenith H725
|
| I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM |
|
Zenith H725
|
| The PSU filter cap arrived today (thank you USPS!) so I will work on that later.
Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM |
|
Philco 610B oscillator wiring
|
| Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM |
|
Who's Online
|
There are currently 2298 online users. [Complete List]
» 1 Member(s) | 2297 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
