Plea to Edd

5/18/2009 9:27:58 PMBob Z

Looking for a schmatic for a Grundig 3265U.

Problem is radio works great for hours, then a random goes into a loud hum, power off and on and it is usually ok for a few more hours, or a few more days.

Trouble is in audio section as changing inputs makes no difference, but a schmatic would make trouble shooting a lot easier then looking up tube diagrams.
Hope you can help.
Thanks Bob

5/19/2009 9:31:08 AMDennis Wess

I'm not Edd.........but schematic sent.

5/19/2009 10:45:30 AMBob Z

Got it, and thank you very much.
Bob

:I'm not Edd.........but schematic sent.

5/19/2009 3:32:55 PMEdd

Additionally . . . . . just in case of . . . . . Brothers In Arms . . . . In Dire Straits . . . . Searching . . . . All Night Long.

73's de Edd

GRUNDIG-MAJESTIC_Model 3265U. . . . . . SCHEMATIC :

5/19/2009 4:55:36 PMBob Z

And I thank you also. Now I really have no excuse not to fix it.
Thanks Bob

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5/20/2009 8:56:43 AMBob Z -Found it

Looks like the common lead inside the filter cap. would go open after a few seconds of higher then normal line voltage. At least this is how it tested using a varic. At 120 line voltage all was well, and radio would play for days, but bring it up to about 125 and loud 120 Hz hum. Put scope on DC buss and about 100 volts of ripple. Turning down the voltage did not stop it, but complete power down, then bring it up to less thatn 125 and all was well. Never saw that before.
Thanks to Dennis and Edd for the info.
Bob

:Looking for a schmatic for a Grundig 3265U.
:
:Problem is radio works great for hours, then a random goes into a loud hum, power off and on and it is usually ok for a few more hours, or a few more days.
:
: Trouble is in audio section as changing inputs makes no difference, but a schmatic would make trouble shooting a lot easier then looking up tube diagrams.
:Hope you can help.
:Thanks Bob

5/20/2009 9:40:50 AMEdd

:Looks like the common lead inside the filter cap. would go open after a few seconds of higher then normal line voltage. At least this is how it tested using a varic. At 120 line voltage all was well, and radio would play for days, but bring it up to about 125 and loud 120 Hz hum. Put scope on DC buss and about 100 volts of ripple. Turning down the voltage did not stop it, but complete power down, then bring it up to less thatn 125 and all was well. Never saw that before.
:Thanks to Dennis and Edd for the info.
:Bob

5/20/2009 9:55:13 AMBob Z

Edd,
It was a can type cap. Tested good when removed, but the problem looks to be gone.
No this one uses a normal EM84 indicator. The set with the EM85 is working fine, (and I use it in the dark so I can see the EM85 indicator ;-) ). This set has a nice bright EM84. I'm starting to feel comfortable with Grundigs after working on 4 of them and the one set from East Germany. It's like they never looked at an american set when they designed theirs. Especially the power transformer, the HV leads are about 26 gauge, I guess they just brought out the winding in a insulated sleeve.
The Grundig with the EM85 had 2 strange problems, one was a coupling capacitor, the type encased in clear plastic, had a spot where the plastic was missing and the outside foil was grounding to the chassis. Had normal voltage on the grid but no plate voltage on the tube driving it, then after poking around I moved the capicator and all was well. Then the FM would not work and would load down the B+, turned out to be a feedthru capicator in the FM RF Module, replaced with a small cramic and wire, works ok.
Biggest problem with Grundig is the big band switch wiring and figuring it out.

Thanks again for your input.
Bob

::Looks like the common lead inside the filter cap. would go open after a few seconds of higher then normal line voltage. At least this is how it tested using a varic. At 120 line voltage all was well, and radio would play for days, but bring it up to about 125 and loud 120 Hz hum. Put scope on DC buss and about 100 volts of ripple. Turning down the voltage did not stop it, but complete power down, then bring it up to less thatn 125 and all was well. Never saw that before.
::Thanks to Dennis and Edd for the info.
::Bob
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Sir Bob. . . .ZEE:

Congrats !. . . .another one bites the dust . . .

I certainly don't remember the fine detail of the infrastructuring of those "cherman" electrolytic capacitors, possibly excepting the potential SURGE of current used in the spotwelding of the axial end wire leads onto the end caps of the units.UNLESS your used a can, and even then, I questioned those crimped aluminum rivets that you see the multiple criss-cross markings on their heads.

Seems like I remember their black dipped common Wima paper / poly capacitors more distinctly.

Your fault sounds more common with the type of failure of some of our "Pwemium Bwewed" ceramic encased paper capacitors, wherein they would have the rounded, coiled up,splayed out ends of the foils on the caps ends, relying upon interconnect via a giant solder blob with the wire lead embedded into it.

With time passage, the end sealant would shrink up, to then let the connection loosen up and an intermittentcy. . . or open. . . .evolve.

BTW was that set the one that got the new "exotic" tuning eye tube ?

73's de Edd

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:Sir Bob. . . .ZEE:
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:Congrats !. . . .another one bites the dust . . .
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:I certainly don't remember the fine detail of the infrastructuring of those "cherman" electrolytic capacitors, possibly excepting the potential SURGE of current used in the spotwelding of the axial end wire leads onto the end caps of the units.UNLESS your used a can, and even then, I questioned those crimped aluminum rivets that you see the multiple criss-cross markings on their heads.
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:Seems like I remember their black dipped common Wima paper / poly capacitors more distinctly.
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:Your fault sounds more common with the type of failure of some of our "Pwemium Bwewed" ceramic encased paper capacitors, wherein they would have the rounded, coiled up,splayed out ends of the foils on the caps ends, relying upon interconnect via a giant solder blob with the wire lead embedded into it.
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:With time passage, the end sealant would shrink up, to then let the connection loosen up and an intermittentcy. . . or open. . . .evolve.
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:BTW was that set the one that got the new "exotic" tuning eye tube ?
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:73's de Edd
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