Source 1/4" shaft tuning caps

J

John Mathews

Guest
Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?

Thanks for any suggestions.

John
 
John Mathews <jmathews@sigtray.com> wrote in
news:l141819mdajpvjmdhnb9seolh2b8aq4ls7@4ax.com:

Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?

Thanks for any suggestions.

John
Click to expand...
http://www.oselectronics.com/ose_p96.htm

I just bought a bunch and made crystal radios with a group of kids. It's
fun to see computer age kids get excited about the functionality of
primitive technology.
 
John Mathews wrote:

Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?

Thanks for any suggestions.
Click to expand...
How about the voltage and frequncy range ?

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
"John Mathews" <jmathews@sigtray.com> wrote in message
news:l141819mdajpvjmdhnb9seolh2b8aq4ls7@4ax.com...
Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?
Click to expand...
Mainline in the UK makes some of the old Jackson Bros range.

Leon
 
John Mathews wrote:
Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?

Thanks for any suggestions.

John
Click to expand...
How about the miniature tuning caps used in AM/FM radios? Made in bazillions per
year, reasonably stable and cheap. Trim caps are included.

An inexpensive coupler could extend the shaft as needed.

Mike Monett
 
On Tue, 10 May 2005 13:55:53 +0200, the renowned Rene Tschaggelar
<none@none.net> wrote:

John Mathews wrote:

Can anyone advise regarding a source for variable tuning caps with a
1/4" shaft? Similar to those used in "old time" radio tuners.

I would prefer single gang, half plate and linear, or the closest
thing to it. And in the smallest possible physical size.

Capacitance value is not a consideration. The circuit can be made to
suit.

We need an ongoing supply, so a surplus is not ideal. But is anyone
still making or stocking them as a regular item?

Thanks for any suggestions.
Click to expand...

These guys in the UK seem to still be making them, at least in small
quantity, however the shaft diameter is "6.35mm". ;-)

http://www.mainlinegroup.co.uk/jacksonbrothers/5250.htm

They used to be Jackson Brothers. I just scanned the last PDF page of
their history. A sad story of a company at the trailing edge.

How about the voltage and frequncy range ?

Rene
Click to expand...

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
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