Janszen Z-300 Help

[Jeromatic]

Hey Everybody!


Long time reader, first time poster here.


Recently I had the good fortune of winning some Janszen Z-300’s at an auction. One of them works well....sounds FANTASTIC... The other has no life coming from the electrostats.


I’ve replaced the power caps, a pot, the rectifier (with three diodes in series). The transformer on the ac line tests OK… but the transformer connected to the stats (labeled “Model 65 8 Ohms”) has an open secondary.


David Janszen of Janszen speakers (who has been very helpful) suggested that the flux joints inside the transformer on the secondary might be corroded where the connection wires meet the fine winding, and may need to be resoldered. After digging through lots of insulation, I found the connection wires disappeared underneath the “belly band” that is wrapped around the top of the transformer, so I never reached the fine winding, then I gave up. Here's some some after pictures:




Does anyone have any ideas where I might find that fine winding connection, and how I might get to it? I think I would also seriously consider replacing this transformer if I could find a donor, or a similar transformer that could do the job of powering the electrostats. Any help you guys could give would be greatly appreciated!

 

[Castles]

May you send me some images of the speakers and amply?
I am now finding an amply for JZ-800. Tks!
Huy
Viber: +84904167898
Email: tdhuy@outlook.com

 

[Jeromatic]

Just an update on my previous post. I thought it may be helpful for folks that may come across the same model.

I ended up finding a "donor" for the step-up transformer. There was a cut cord Janszen Z-400 on the bay that I snatched up. Z-400s are essentially z-300's in a different case, with a different panel layout. I was able to use the transformer from that. I discovered that the stat panels also needed to be replaced, so the z-400's panels went to that.

Here's what I discovered while working on the Z-300's:
• You can't access the tweeters from the back! I only discovered this after I fruitlessly pried the back off of the speaker.
To access to the tweeter stats, you must remove the the wood divider that is glued in at the top of the grill.
• If you decide to replace the woofer's grill with some new cloth, be aware that it is held in with a couple of tiny nails. Most of the cloth on
my z-300s have turned brownish with age.

In addition to this, I needed to refinish one of the speakers, as it had only been about 10 feet away from a pipe that had burst in our basement.
The force of the pipe burst power washed the finish right off of the right side of the speaker.
Fortunately, there was no conventional water damage to the speaker. Can't say that for some of the other vintage electronics that met their end that day...
Anyway, I used some Varithane Poly Stain to restore the finish, and it seems to match the other speaker pretty well.

Short story long, I've managed to get the speaker working after transplanting the 'stats and the step-up transformer. After testing the speakers in the front room, I think I've realized that the speaker that had functioned from the beginning could now benefit from a cap and rectifier change.

 

[toneaudio]

Hello! Bringing back this old thread... Can anyone tell me if that seperate Janszen tweeter that some used as a super tweeter, uses the same elements as the A300s? I may be buying a pair with a blown tweeter.

Thanks in advance