Zenith X334/7n07 schematic pdf?

[TheShanMan]

I'd like to buy an original schematic but until I get a copy in my hands, does anyone have a pdf of this schematic I can use to help put together a cap list so I can order new caps?

[TheShanMan]

There is one cap that has "322-103" printed on it. I'm pretty sure "103" is the value because .01u is a normal value whereas .0032u would be quite atypical (vs .0033u). However, odd values sometimes exist on old stuff so it would be nice to confirm in the schematics. Getting a schematic, even original, may be easier said than done though. Schematic Man doesn't have this one listed on his site (waiting for a reply to my email to him).

Perhaps someone can tell me with certainty that with such a printing on the cap, I should ignore the first part of the number and go with the second?

[dieseljeep]

Originally Posted by TheShanMan

There is one cap that has "322-103" printed on it. I'm pretty sure "103" is the value because .01u is a normal value whereas .0032u would be quite atypical (vs .0033u). However, odd values sometimes exist on old stuff so it would be nice to confirm in the schematics. Getting a schematic, even original, may be easier said than done though. Schematic Man doesn't have this one listed on his site (waiting for a reply to my email to him).

Perhaps someone can tell me with certainty that with such a printing on the cap, I should ignore the first part of the number and go with the second?

I thought the later models of Zenith AM/FM radios were mostly disc capacitors, that seldom needed replacement. The only ones would be the line filters and the electrolytics.
That's probably one of the last tube models.
It might be in Beitman's 1967-69 manual. I used to look them up at Make-A-Radio, web site.
The only thing, it's not PDF, but DGVU ???, which I can't seem to use on the computer.

[Paul Knaack]

This is what the Radio museum website says for X334M 2-2345 Ch= 7N07
http://radiomuseum.org/r/zenith_x334...7n077_n_0.html
Mentioned in Set 916 Folder 8
I've got folders 915 and 917 but not 916. Hopefully someone can take a look for you.

[spacey37308]

I just got one of these last weekend. I cleaned it with deoxit and put a tweeter in. I am refinishing the cabinet.

[TheShanMan]

Cool! I look forward to getting to that point with mine. I still need to work on mine.

Someone did give me a copy of the schematic BTW.

[Captainclock]

Originally Posted by spacey37308

I just got one of these last weekend. I cleaned it with deoxit and put a tweeter in. I am refinishing the cabinet.

Um, I hope you didn't put a regular paper cone tweeter in there, because this radio was designed for an electrostatic tweeter which uses the plate current off of the 50C5 output tube to power it, if you put a standard paper cone tweeter in place of the electrostatic tweeter you're going to risk causing a fire because paper cone tweeters aren't made to withstand the 300+volts of plate current being given off by the radio to power the electrostatic tweeter circuit.

[Captainclock]

Originally Posted by TheShanMan

Cool! I look forward to getting to that point with mine. I still need to work on mine.

Someone did give me a copy of the schematic BTW.

Please whatever you do, leave the original Electrostatic tweeter alone and don't try to replace it with a regular paper cone tweeter because you'll risk causing a fire because they aren't designed to withstand the 300+volts of plate current coming off of the 50C5 tube in that radio which is what powers the electrostatic tweeter, if anyting just replace it with a modern electrostatic ribbon tweeter then you'll be fine, but please for the name of all things holy don't put a paper cone tweeter in there!

[Electronic M]

Originally Posted by Captainclock

Please whatever you do, leave the original Electrostatic tweeter alone and don't try to replace it with a regular paper cone tweeter because you'll risk causing a fire because they aren't designed to withstand the 300+volts of plate current coming off of the 50C5 tube in that radio which is what powers the electrostatic tweeter, if anyting just replace it with a modern electrostatic ribbon tweeter then you'll be fine, but please for the name of all things holy don't put a paper cone tweeter in there!

If you drive the paper cone tweeter off the same place as the PAPER CONE WOOFER, with a series crossover cap it WILL BE perfectly SAFE, and I'm confident most here are smart enough to do it the way I just described.

I like the e-stats better, but if a paper cone is what you got to replace a bad e-stat with why not.

[Captainclock]

Originally Posted by Electronic M

If you drive the paper cone tweeter off the same place as the PAPER CONE WOOFER, with a series crossover cap it WILL BE perfectly SAFE, and I'm confident most here are smart enough to do it the way I just described.

I like the e-stats better, but if a paper cone is what you got to replace a bad e-stat with why not.

The reason why I said that is becase there are some self professed "newbies" to the tube world on this website and I'm sure that those people wouldn't know any better than to try and power a paper cone tweeter off of the same hookups as the original electrostatic tweeters were powered off of.

And actually a brand new electrostatic tweeter isn't that much more than a standard paper cone tweeter so one could easily install a brand new modern electrostatic tweeter into an old Zenith like this and still be ahead, they have them over at parts express for like $15 or so.

[dieseljeep]

Originally Posted by Captainclock

The reason why I said that is becase there are some self professed "newbies" to the tube world on this website and I'm sure that those people wouldn't know any better than to try and power a paper cone tweeter off of the same hookups as the original electrostatic tweeters were powered off of.

And actually a brand new electrostatic tweeter isn't that much more than a standard paper cone tweeter so one could easily install a brand new modern electrostatic tweeter into an old Zenith like this and still be ahead, they have them over at parts express for like $15 or so.

That new of a Zenith radio has the standard hard paper cone tweeter.

[Captainclock]

Originally Posted by dieseljeep

That new of a Zenith radio has the standard hard paper cone tweeter.

I saw the picture of it online and it has an electrostatic tweeter in it, I didn't see this guys particular radio but one that was the same model I should say.