AF6AY wrote:
In a box of traded parts I found a cylindrical object labeled
"Clevite Ceramic Filter TL10D16A" that may be some sort
of IF filter according to very dusty old memory files. I would
appreciate it if anyone knows of this brand and can give me
an approximate center frequency and, perhaps, impedance
loading of terminations.

Hermetically sealed about 1 1/2" long by 1/4" diameter, leads
coming out ends of metal case. Unused by appearance of
end wires. Perhaps 30 to 40 years old? Trader had no idea
where he got it (probably in a trade of his).

Clevite is an old company and was purchased by Gould
Electronics some time in the late 1960s. Can't find anything
on this part in web search now.

My thanks for reading. If anyone has any info, feel free to
post it privately or publicly.

73, Len AF6AY

I've got one which looks identical, but with a different part number
(TL6D11:A). Mine is a 455KHz centre frequency, 6KHz filter which was
used as the AM filter in the UK/PRC-316 radio. From the circuit, I'd say
it should terminate in 1K ohms.

Clevite was a UK company, based in Southampton, and part of the Brush
Electrical group. They specialised in ceramic filters - and seem to have
been one of the first commercial suppliers of these. I've got other
equipment which uses Clevite filters, and I can assure you these are not
cheap alternatives to crystal filters - they are high grade components
in their own right.

I'll bet your item is on one of the standard IF frequencies - try
100KHz, 455KHz, 1.4MHz, 5MHz etc.

On Oct 6, 12:21�pm, Gaius wrote:
AF6AY wrote:
In a box of traded parts I found a cylindrical object labeled
"Clevite Ceramic Filter �TL10D16A" that may be some sort
of IF filter according to very dusty old memory files. �I would
appreciate it if anyone knows of this brand and can give me
an approximate center frequency and, perhaps, impedance
loading of terminations.

Hermetically sealed about 1 1/2" long by 1/4" diameter, leads
coming out ends of metal case. �Unused by appearance of
end wires. �Perhaps 30 to 40 years old? �Trader had no idea
where he got it (probably in a trade of his).

Clevite is an old company and was purchased by Gould
Electronics some time in the late 1960s. �Can't find anything
on this part in web search now.

My thanks for reading. �If anyone has any info, feel free to
post it privately or publicly.

73, Len �AF6AY

I've got one which looks identical, but with a different part number
(TL6D11:A). Mine is a 455KHz centre frequency, 6KHz filter which was
used as the AM filter in the UK/PRC-316 radio. From the circuit, I'd say
it should terminate in 1K ohms.

Clevite was a UK company, based in Southampton, and part of the Brush
Electrical group. They specialised in ceramic filters - and seem to have
been one of the first commercial suppliers of these. I've got other
equipment which uses Clevite filters, and I can assure you these are not
� cheap alternatives to crystal filters - they are high grade components
in their own right.

I'll bet your item is on one of the standard IF frequencies - try
100KHz, 455KHz, 1.4MHz, 5MHz etc.- Hide quoted text -

Thanks to a kind person who supplied me with Clevite catalog data
plus some other Clevite literature, I correctly identified my
Clevite TL-10D16A filter. It has a 455 KHz center-frequency,
-6 db bandwidth of 10 KHz, -60 db BW of 16 KHz. 1500 Ohms input
and output impedance. Insertion loss about 7 db. Data from
Clevite Bulletin 94012 dated Octover 1961. Bench testing shows
a fairly flat passband and very steep skirt attenuation. In a
couple of weeks I might have access to better instrumentation to
quantify its response characteristics.

Clevite was located at 232 Forbes Road, Bedford, Ohio, known in
Clevite Electronic Components, a division of Clevite Corporation,
Cleveland, Ohio. By 1969 they were at the same address and
known as "Gould Piezoelectric Division" with a zip code of 44146.
Piezoelectic devices had been in production since 1959. Whether
it was later acquired by a UK firm is unknown on what I have.

One of the interesting bits of information was a data sheet on
Clevite "Identical Resonators" which contains 10 tables of ladder
filter arrangements from 2 to 8 resonators as bandpass filters
using only capacitors as coupling elements. That might be
applicable to quartz crystal resonators.

73, Len AF6AY