[solved]Schematic for Webcor Pixi phonograph

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[solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Thu Jun 08, 2017 5:24 pm

I am looking for a schematic diagram for a Webcor Pixi phonograph.  It has a single 25L6GT tube amp.  One of the resistor has burnt and I need the schematic to see what the value is.  The case is red/white textured covering.

Thank you!

Dave Smith
South Jordan,UT

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by Bill Cahill on Fri Jun 09, 2017 5:17 pm

Welcome to TRF.
The Webcor made this simple machine using a single tube 25L6 as a simple audio amplifier. A selenium rectifier made the direct voltage to the amplifier stage. The usual amount of voltage was usually around 90-95 volts. The problem is the rectifier is usually shorted out.
Further, the cartridge is a simple 3V cartridge.
My feeling is you should know if you want to spend the money, and, time restoring it.They generally have a nic sound to them, but, they aint no hi-fi.
Hope this helps.
Bill Cahill

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by Paulieb880G on Sat Jun 10, 2017 12:25 am

In the way of a suggestion, you might check to see if you have B+ anywhere in the amplifier. Is the resistor just burned from dropping voltage and running hot or is it burned in two? Have you checked it with an ohm meter? If you have B+, that would be obvious that the selenium rectifier would not be shorted. I don't believe you have enough information to sustain that theory. The resistor you reference may be in the heater string. If so, it drops lots of voltage and will run pretty hot. Do some investigation before you come to any conclusions. You can use Ohms' Law to figure out which resistor you need if you know what circuit it is in. That amplifier is basic, so it should not take much to figure it out. If the cartridge is bad, you can substitute something newer many times to get the record player up and running if you choose to go that route.

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by Bill Cahill on Sat Jun 10, 2017 2:06 am

It was common to put a 90 volt motor in series with the 25 volt filament of the tube. It was common for the rectifier to short out, and, burn a resistor usually in series with the high AC line.
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Re: [solved]Schematic for Webcor Pixi phonograph

Post by John Bartley on Sat Jun 10, 2017 9:47 am

homebuilt52 wrote:I am looking for a schematic diagram for a Webcor Pixi phonograph.  It has a single 25L6GT tube amp.  One of the resistor has burnt and I need the schematic to see what the value is.  The case is red/white textured covering.

Thank you!

Dave Smith
South Jordan,UT

I found this schematic on line. It's for a Webcor F-136-1.   I don't know if the "Pixie" has a model number other then the name, but maybe this is close enough to get you started?


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Re: [solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Mon Jun 12, 2017 10:55 am

Thank you guys for the information. I will check the resistor value against the schematic diagram. The burnt resistor is burnt in two. The resistor comes off the rectifier so I will check the rectifier.

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Mon Jun 12, 2017 1:35 pm

I tried to attach a picture of the circuit but the website will not let me.  Any hints as to how to attach a picture?

Thanks!

Dave

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by John Bartley on Mon Jun 12, 2017 6:01 pm

homebuilt52 wrote:I tried to attach a picture of the circuit but the website will not let me.  Any hints as to how to attach a picture?

Thanks!

Dave

Send it to me at (removed) and I'll post it for you.

cheers


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Re: [solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Mon Jun 12, 2017 7:48 pm

As per the picture that John so graciously posted for me the resistor coming off the rectifier has burnt in two. I am not sure what the value is as the color bands are burnt.  I also plan on replacing the capacitors as well. Any hint on the value of the burnt resistor?

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by John Bartley on Mon Jun 12, 2017 9:49 pm

The schematic that I posted is close but not exactly the same.

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by Tony V on Tue Jun 13, 2017 1:03 am

Just for future reference, there's a topic posted at the top of each catagory that tells you how to attach pictures to your post. Good luck on your project and welcome to TRF Dave!
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Re: [solved]Schematic for Webcor Pixi phonograph

Post by John Bartley on Tue Jun 13, 2017 8:24 am

homebuilt52 wrote:As per the picture that John so graciously posted for me the resistor coming off the rectifier has burnt in two. I am not sure what the value is as the color bands are burnt.  I also plan on replacing the capacitors as well. Any hint on the value of the burnt resistor?

It's difficult to see the colours clearly, but it "looks" like orange-violet-black ?? That would be 37 ohms? Any chance of a closer photo of the resistor with no flash glare on it?

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by Paulieb880G on Tue Jun 13, 2017 10:51 pm

It looks to me like the burnt resistor comes off one terminal of the rectifier. Could it be R4 in the diagram, 47 ohms?

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Thu Jun 15, 2017 2:16 pm

Here is another picture of the resistor without some of the glare on it.


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Re: [solved]Schematic for Webcor Pixi phonograph

Post by John Bartley on Thu Jun 15, 2017 2:38 pm

It's really hard to say, but it looks like :
1 - orange - 3
2 - brown - 1
3 - black or brown x1 or x10

So ... 31 or 310 ohms?

The schematic I found is not really close so I'm going to remove it unless you think it still helps a bit anyway.

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Re: [solved]Schematic for Webcor Pixi phonograph

Post by easyrider8 on Mon Jun 19, 2017 4:15 am

The surge resistor is usually a low value so 31 sounds reasonable. A 33 would be easier to find for a replacement, The value is not that critical. The main purpose is to protect the selenium. Replace the filter electrolytics and the other capacitors and check and replace any out of spec resistors and it should work fine.
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Re: [solved]Schematic for Webcor Pixi phonograph

Post by homebuilt52 on Mon Jun 19, 2017 10:30 am

Thanks you guys for the information.  I will go with the 33 ohm value, replace the caps and check the other resistor values.  I'll let you know how the restoration goes.

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