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Messages - electra225

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Wanted / Re: Magnavox Stereo Theater
« on: Today at 10:31:47 AM »
A Stereo Theater minus the Theater.  That seems to be a common problem.

I'd say it was a version of Concert Grand as well.  Does it have a reel to reel tape deck?  CG is the only model I can recall with glass lids and a clock.

This may be a mono 1958 Concert Grand with a stereo tape deck.  Seems to me I remember a lesser Magnavox instrument housed in the CG cabinet, or one quite similar, but don't quote me on that.  There should be a small amplifier with a 5Y3, 12AX7 and two 6AQ5's for the stereo tape deck.

Chat / Re: Current project
« on: Today at 09:52:18 AM »
Looks great to me as well.  If anybody criticizes, ask to see theirs so you can lay your eyes on perfection.   ;)

Magnificent Magnavox / Re: Astro Sonic Capacitor question
« on: April 19, 2018, 10:53:07 PM »
All I know is what I've read.  I have never actually repaired a solid state device in my life.  There are several good threads on Magnavox solid state instruments on here.  We have members on here who are well-experienced with solid state stuff.  Hopefully they will chime in here to set you straight.  I'd probably replace all the paper and electrolytic caps like I would in a tube instrument.  Good luck.

Magnificent Magnavox / Re: Newb with a few questions
« on: April 18, 2018, 09:26:59 PM »
He should be okay using the MPX input for testing the phono circuit.  I believe he was on the right track divorcing the phono input just for test.   I have a spare parts turntable, but I believe I have already robbed the cartridge.  When I get home, I'll take a look at my parts turntable.

Magnificent Magnavox / Re: 1963 Danish Classic
« on: April 18, 2018, 09:12:06 PM »
The MPX is only in the circuit in the "FM stereo" position of the function switch.  Does the balance control have any affect on the situation?

Magnificent Magnavox / Re: Magnavox remote control
« on: April 17, 2018, 10:00:12 PM »
I have never seen one that I remember.

Magnificent Magnavox / Re: Newb with a few questions
« on: April 17, 2018, 06:47:45 PM »
Now we are getting somewhere!   :)

Best advice I can give is to find an original Collaro turntable on ebay with the original EV or Euphonics cartridge and go from there.  Make sure it works before you buy it.  Ask the seller if it works.  IF they do not know or will not tell you, find another one.  They are not rare.  If you get one that way and the cartridge turns out not to be good, you can get your money back by filing a SNAD claim.  I do not like those aftermarket kluge cartridge setups and did not trust yours from jump street.  I have a spare EV 26 and a month ago, I would have sent it to you for postage.  After seeing what you have gone thru, I believe I'll hold on to it.  I have five Magnavox stereos, so I may need it sooner or later.  Your problem may be due to some issue with cartridge compliance.  Before you do anything else, maybe you should contact Gary at VM Enthusiasts and see what he recommends.  He gives good service and stands behind what he sells.  Maybe you simply got bad parts.  That happens. 

I like using original equipment even if it takes a bit longer to get the right stuff. 

Sightings / Re: Magnavox color theatre Singapore 21 - PA
« on: April 17, 2018, 03:54:37 PM »
I've not seen any evidence that an all-tube color Stereo Theater was ever built.  There was a three-piece color Stereo Theater listed in the 1961 catalog, but it is not in the 1962 catalog.  My understanding is the first color Stereo Theater in one cabinet was introduced for the 1963 model year with an Astro-Sonic solid state stereo and was a roundie.  If you have hard evidence of an all-tube color Stereo Theater for 1962, I'd be interested in seeing it.

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 11:23:39 PM »
When you get back on this, maybe rigging up a way to run the changer on a different input will reveal something.  You deserve to make forward progress.   ;)

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 09:42:42 PM »
Is the ground to the balance control okay? 

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 08:52:56 PM »
Can you engineer some type of system to power the changer separate from the console?  I made up a power cord so I can do just that if I need to.  Have you gotten deeper into a possible problem with the balance control itself?

I typically find I have to use a higher volume setting on phono than I do either tape input or tuner input.  I attributed this to cartridge aging.  I would not be concerned with an approximately 10% lower output from the cartridge than from the tuner.  The sound quality from the phono is generally better.  Magnavox made their reputation playing records.  Like I said earlier, faulty performance of any kind is not normal for a Magnavox.  You should grin every time you start it up.

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 07:29:25 PM »
I see now what you are doing.  Following this line of thought for a moment.

You said in an earlier post that the sound from your CD player in the tape input and the MPX input, stereo inputs, sounded okay.  The AM and FM mono positions did not.  This is contradictory from what you just posted.  You said that in mono, the balance control was out of the loop, in stereo it was in use.  So if a mono input sounds bad when the balance control is out of the circuit and stereo input sounds okay when the balance control is in the circuit, how does this place the fault on the balance control?  That is an odd circuit arrangement, but it should still work if everything is right.  Have you confirmed that the balance control is okay?  When you essentially short across the balance control, the audio sounds okay.  That sounds like the balance control is the problem.  This makes no sense to me, as it seems contradictory.  What am I missing?

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 06:23:51 PM »
FM and AM operation not affected by the balance control?  Where do you see that?  You may have tried using a changer with a magnetic cartridge.  It's output will be lower than the .5 volts the system requires for full volume.  Is it possible there is an open ground on the balance pot?  The only way I know of to check the output of a cartridge would be with a scope.  Are you grounding the input to the balance pot?  I still don't follow what you're doing.   :-[

One schematic shows the value of the balance pot as 50K,with the center tap grounded. One schematic I have, closer to what you say you are working on that the one you posted, shows the value of the balance control as 750 ohms, and the center tap is not grounded.  They are wired totally differently.  A scope or a signal tracer might help shed some light on this situation.  I keep an old BSR changer with an Astatic ceramic cartridge around just for occasions like this.  That old plow has bailed me out more times than I can count on all my fingers.  I have not found the right schematic, but I have not given up. 

Magnificent Magnavox / Re: Newb with a few questions
« on: April 16, 2018, 04:00:22 PM »
The best advice I can offer at this point is to ignore about 99% of what you read on AudioKarma.  Especially disregard anything you read on that site about Magnavox.  I'll see if I can come up with a schematic that makes more sense.  I have run into a situation that I needed two Photofacts folders to get what I needed.  I still believe your problem is related to the phono cartridge.  Problem is, I can't prove it.   :-[
Did you try feeding the CD player thru the phono input?  The CD player may not have enough output to drive the amp to full volume, but you should be able to tell if the audio is clear.  Try disconnecting the phono input completely from the tuner to see if the audio clears up with the cartridge unplugged.  I have a schematic for another tuner that is close to yours.  All the inputs go thru the function switch.  If the audio is good in MPX or tape input, it should be good on every input.   AM and FM mono both sound bad? 

Have you found any evidence of someone making "field modifications" to this thing in any way?  Something here is not adding up..... :-\

What happens to everything that "sucks" if you ground the balance pot?  I still haven't figured out what the balance pot has to do with anything concerning this situation.

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