Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Aug Wed 05, 2020 11:00 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 5 posts ] 
Author Message
 Post subject: Solving the low volume problem with a Zenith hearing aid
PostPosted: Mar Tue 17, 2020 12:03 am 
Member

Joined: Aug Sat 16, 2014 2:19 am
Posts: 1661
Location: Palos Verdes, CA
One way of increasing the volume on a vintage transistor radio needing repairs is to use a hearing aid! The Zenith Crusader hearing aid came out in 1955 and used 4 Raytheon transistors, two of which I found to be CK87 units. The Crusader was a very small hearing aid and as a result was quite expensive at $165. I was surprised to find that the Zenith hearing aid still worked quite well. - Mark


Attachments:
Zenith Royal 500 & hearing aid.JPG
Zenith Royal 500 & hearing aid.JPG [ 81.4 KiB | Viewed 567 times ]
Zenith Royal 500 & hearing aid 2.JPG
Zenith Royal 500 & hearing aid 2.JPG [ 80.88 KiB | Viewed 567 times ]
Zenith Crusader Heading Aid.JPG
Zenith Crusader Heading Aid.JPG [ 52.95 KiB | Viewed 567 times ]
Top
 Profile  
 
 Post subject: Re: Solving the low volume problem with a Zenith hearing aid
PostPosted: Mar Tue 17, 2020 6:06 pm 
Member
User avatar

Joined: Mar Tue 12, 2019 6:09 am
Posts: 240
What do you do? Wire them together? Tape them front to front? (speaker to mic)

I would love to see a pic of a Raytheon CK87. Are they the blue ones?
Your photo is too grainy to see it - or are the elusive Raytheons on the backside?

I have a few hearing aids from that era, collect them too.
Here is a pic of the first commercial hearing aid Raytheon transistor, the CK718 released in 1952.
This pic depicts the guts of a hybrid hearing aid from 1953. (just like the hybrid radios of that era.)
This one is in my collection.


Attachments:
hybrid HA.png
hybrid HA.png [ 869.93 KiB | Viewed 517 times ]
Top
 Profile  
 
 Post subject: Re: Solving the low volume problem with a Zenith hearing aid
PostPosted: Mar Tue 17, 2020 6:55 pm 
Member

Joined: Aug Sat 16, 2014 2:19 am
Posts: 1661
Location: Palos Verdes, CA
I had to use a screwdriver for repairing glasses to take the Zenith hearing aid apart and had a tough time putting it back together! I should have looked at the photos of the hearing aid before I put it back together. The Raytheon CK87 transistors are small cylinders that have color codes on the top. As for using the hearing aid, I just put in a N-cell battery and turned it on, using an earplug that came from a Standard transistor radio. I was surprised to find that the Zenith hearing aid still worked quite well for something so old and so small! Thanks for posting the photo of your Zenith hearing aid with the CK718 transistor. I would have thought that with Zenith's experience with hearing aids using transistors that they could have come out with a transistor radio before the Regency TR-1. Perhaps there was more money to be made with transistor hearing aids. - Mark


Top
 Profile  
 
 Post subject: Re: Solving the low volume problem with a Zenith hearing aid
PostPosted: Mar Tue 17, 2020 9:42 pm 
Member
User avatar

Joined: Mar Tue 12, 2019 6:09 am
Posts: 240
FWIW the pic is of an early 1953 Acousticon hybrid HA.
I also have a few early all transistorized Zenith HA with three CK718s in them.

The reason that Zenith and others did not make transistor radios at that point in time,
was the high cost of transistors and the fact that the high frequency characteristics of transistors then was lousy.
The early hybrid radios only employed transistors for the audio output circuits.
Tubes still reigned supreme for the input side of the radio.
The upside was that these companies could market their products as being "TRANSISTORIZED".

RF issues were non-existent with (all audio circuit) hearing aids. And yes, there was a lot of money to be made.


And overall battery power consumption was kept much lower with transistors.


Top
 Profile  
 
 Post subject: Re: Solving the low volume problem with a Zenith hearing aid
PostPosted: Mar Thu 19, 2020 8:28 pm 
Member
User avatar

Joined: Jun Wed 08, 2011 2:33 am
Posts: 10667
Location: Ohio 45177
My aunt lost her hearing as a girl in the late 30s, maybe. I know she has retained some of her vintage hearing aids like that. I should see if I can talk her out of one of them.

_________________
Reddy Kilowatt says; You smell smoke? Sorry about that!


Top
 Profile  
 
Post New Topic Post Reply  [ 5 posts ]  Moderator: Dave Doughty

All times are UTC [ DST ]


Who is online

Users browsing this forum: slowdivr and 20 guests



Search for:
Jump to:  


































-->


Privacy Policy :: Powered by phpBB