Stellavox main schematic

[gyrator]

Hi friendly community,

It has taken some time to fix the problem but since yesterday I solved the problem. :-)

At first many thanks to charles who was so kind to send me an image copy of the stellavox schematic. Also I received a part of an schematic view from Mr. Dingler (germany) that both help me to compare and show how the circuit works.

The problem on the Stellavox SP7 was an broken "channel 2" the other channel worked in correct order. Sometimes the channel 2 worked also fine but I realised that the problem occur when the switch "Bass cut-off" was turned to position "S".
In Position "S" the Input/Record amplifier starts to oscillating and the amplifier overdrived.

Now I know the problem was in one of the green axial capacitor (15nF) . The housing of capacitor are plastic and become hardending. In combination on his cable tail in small bending radius the wire got disconnected.

I placed a new capacitor and after this the Stellovox runs perfekt.


Here are some pictures that shows the ugly construction of the stellavox and the broken capacitor at the  switch "Bass cut-off":











Thomas

 
PS: By the way Stellavox has an reincarnation found in this http://www.oravox.ch/frame_en.html

[docb]

"Arrrrrhhh, who took me pirate hat?!"

[ironbut]

Too funny Doc!

Seriously though,..
I've been spending a little time looking into hearing aids and hearing loss. My elderly Dad, who I live with, has pretty significant hearing loss and I've spoken to friends who also have parents in the same situation. I was looking into getting him a good hearing aid (for my own sanity I must admit) and asked around to find out what was real world good.
Almost to a person, they told me that they'd bought them hearing aid devices but that the impaired person refused to wear it/them. The biggest complaint was that the sound was so garbled that it was easier to just have the person shout or turn up the TV ( I lived in an apartment above one of these folks and used to be able to feel the dialog from "Days of Our Lives" in my feet!). The makers of these devices claim that you must wear them all the time so your brain will adjust to the sound. The real world problem is that these rather tight fitting devises become uncomfortable after a few hours for many folks and they take them out unless they know they'll need them.

So, the Oravox looks pretty funky but if it works like it should, who cares! I'm sure that for more money a tiny omni mic like a DPA 4060 or a Sankin COS-11 (both of which sound fantastic) could be fitted into a smaller receiver. The point is, the longer our lifespans become, the larger the percentage of the population that'll need these devices will become. I'm so glad to see that someone who knows about good audio has chosen to fill this void. I'd hate to give up this hobby just when I have more time to devote to it.

Thanks for sharing Thomas.

And for that wise guy Dan Schmalle. How do you think the guy manages to color his hair right to the exact point where his sideburns end? Does he mask it off with tape or just put something like Vaseline on his beard?