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Old 5th October 2009, 05:07 AM   #1
mcface is offline mcface  Canada
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Default Found this Trio WX-400

Hey guys so this is my first post here and i wanted to kinda show off my findings.

My city recently had a freecycle day and i found this baby sitting on the curbside staring me down. I swerved over to the side of the road and found a note ontop of this, it read " Free please dont take this and destroy it, i just dont understand it or have any use for it. Give it a good home I work fine."

I picked ut up dusted it off and put it in my trunk along with a pair of AR3-A tower speakers(I will post about later).
So here is what she looks like opened up in all her glory..
Click the image to open in full size.
It had a manual and the wiring schematics and everything.
So i got home and plugged it in and wow the fabulous warming sounds it produced.
So i was just wanting to know if anyone out there can provide me with some info on this thing here. the total model name is :Trio WX-400 valve (tube) receiver
(tuner amplifier.) 1962
Is this thing worth anything or is it just another piece of history.
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Old 5th October 2009, 05:42 AM   #2
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Looks like a nice PP EL84 amp.... Can you post the schema?

dave
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Old 5th October 2009, 05:58 PM   #3
mcface is offline mcface  Canada
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Quote:
Originally Posted by planet10 View Post
Looks like a nice PP EL84 amp.... Can you post the schema?

dave
Here are some poor photos i took, i am trying to get the scanner working atm but with no luck. Also found tucked in the manual a note from the manufacturer. Its typwritten and highly faded but it says:

Quote:
STEREO INDICATOR ADJUSTMENT
This unit is now equipped with a special control at the rear which permits adjustment of the sensitivity of the electronic stereo indicator circuit. This stereo Indicator control has been preset at the factory and will not usually require further adjustment. However, if you find that the stereo indicator does not fully close on a relativity weak stereo station, you can re-adjust the control for increased sensitivity as indicated below.
Tune in the weakest of the stereo stations which you listen. Adjust the stereo indicator control so that the tuning indicator just closes (no shadow area). On strong stereo stations the indicator will overlap, this is perfectly normal. As a final check on the action of the indicator, tune in various strong monophonic stations and not the reaction of the indicator ......... it should never close fully as it does in the case of a stereo station
Once i get my scanner up and running i will be posting all the images as well as a complete page by page of the manual as its only 8 pages long.

Anyone have a good idea on how to clean the dust out of the insides of the amplifier? will compressed air damage the tubes or anything? I am quite a newb to tubes. so any info would be great.
Click the image to open in full size.
Click the image to open in full size.

I also noticed on the scematics that there have been some revisions done in pen, just written over top the printed diagram.
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Old 9th October 2009, 12:24 PM   #4
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To remove the sticky dust often found inside old radios, I use cotton buds and methanol. It takes a lot of time though. And don't use it on coils or transformers, it damages the enamel on the wires!

If you worry about damaging the tubes, just take them out.
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Old 9th October 2009, 06:13 PM   #5
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I'd use isopropanal as opposed to methanol...

The amp stage is a 12AX7 voltage amp driving a 12AX7 concetina and an EL84 push-pull stage. Lots of options for a modern update -- El Cheapo, Red Light District, maybe Baby Huey (the OPTs are not UL), especially if it is point-to-point wiring

dave
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Old 10th October 2009, 06:14 PM   #6
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Quote:
Originally Posted by planet10 View Post
I'd use isopropanal as opposed to methanol...
dave
Dave, why is that? I'm asking because methanol is much easier to find in stores here, as opposed to isopropyl.

Kenneth
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Old 10th October 2009, 06:46 PM   #7
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Quote:
Originally Posted by kavermei View Post
Dave, why is that? I'm asking because methanol is much easier to find in stores here, as opposed to isopropyl.
Isopropanol ias very available here... can't recall seeing methanol available.

You commented that methanol can take the enamel off the wire in coils, here isopropanol does no harm in my experience.

dave
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Old 10th October 2009, 07:35 PM   #8
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Great, if I ever spot it, I'll surely try it.
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Old 10th October 2009, 08:13 PM   #9
TheGimp is offline TheGimp  United States
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Isopropyl is available in 50% and 70%. You can usually find it among medical supplies (drug store, medicine isle at WalMart, etc).

70% makes a better antiseptic.

I don't know which would be better for cleaning.
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Old 10th October 2009, 08:16 PM   #10
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Quote:
Originally Posted by planet10 View Post
Isopropanol ias very available here... can't recall seeing methanol available.
Sold here as Methyl Hydrate: http://en.wikipedia.org/wiki/Methanol

I used to fire a small steam engine with this as a child.

Jeff
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