Hi,

I recently aquired a "De Forest Audion 566". The box had "566 (866)"
written on it. I can't find any data on the 566 or whether it would be
reasonable to substitute the device in a circuit which calls for a 866A.

Any assistance would be appreciated.

Thanks !

Ed

On Sun, 13 Jul 2003 23:50:42 -0400, "Ed" wrote:

Hi,

I recently aquired a "De Forest Audion 566". The box had "566 (866)"
written on it. I can't find any data on the 566 or whether it would be
reasonable to substitute the device in a circuit which calls for a 866A.

Any assistance would be appreciated.

Thanks !

Ed


The 866A is a half-wave mercury rectifier used in transmitters,
modulators, and similar equipment. It's rated 10,000 volts PIV and
0.25 amps average.

The tube is in a large ST-shaped package with a large plate cap and a
four-pin base. Height is 6 9/16 inches including pins and plate cap.
The diameter at the shoulder is 2 7/16".

You can usually see small drops of mercury clinging to the inside of
the glass. Does this sound like your 566?

At these power levels, I would not suggest substituting one tube for
another unless your ABSOLUTELY SURE that the sub is correct in your
particular application.


73 de Leigh W3NLB

Hi Leigh,


Yes thats sounds about right. I'm looking for specific data on the 566 and
so far I've been able to find none - not even a mention anywhere.


Ed


"Leigh W3NLB" wrote in message
...
On Sun, 13 Jul 2003 23:50:42 -0400, "Ed" wrote:

Hi,

I recently aquired a "De Forest Audion 566". The box had "566 (866)"
written on it. I can't find any data on the 566 or whether it would be
reasonable to substitute the device in a circuit which calls for a 866A.

Any assistance would be appreciated.

Thanks !

Ed


The 866A is a half-wave mercury rectifier used in transmitters,
modulators, and similar equipment. It's rated 10,000 volts PIV and
0.25 amps average.

The tube is in a large ST-shaped package with a large plate cap and a
four-pin base. Height is 6 9/16 inches including pins and plate cap.
The diameter at the shoulder is 2 7/16".

You can usually see small drops of mercury clinging to the inside of
the glass. Does this sound like your 566?

At these power levels, I would not suggest substituting one tube for
another unless your ABSOLUTELY SURE that the sub is correct in your
particular application.


73 de Leigh W3NLB