16 volt pilot lamp for FT-101

[Paul P]

Can anyone point me to a source for the 16 volt bayonet pilot lamps use to
protect the receive circuit of the Yaesu FT-101?

Thanks,
Paul P.

[Scott Dorsey]

Post by Paul P
Can anyone point me to a source for the 16 volt bayonet pilot lamps use to
protect the receive circuit of the Yaesu FT-101?

What's the number on them?
--scott

[Paul P]

Post by Scott Dorsey

Post by Paul P
Can anyone point me to a source for the 16 volt bayonet pilot lamps use to
protect the receive circuit of the Yaesu FT-101?

What's the number on them?
--scott

That would be easy and a lamp number is one of the first things I looked for
:~) But this lamp only has volts and amps stamped on the base (at least
that is what was embossed. Not all the characters took.). It does have 16v
at 0.15 amps clearly embossed. There is no number in the Yaesu parts list
either.

Sorry but that is all I have.

Paul P.

[Scott Dorsey]

Post by Paul P

Post by Scott Dorsey

Post by Paul P
Can anyone point me to a source for the 16 volt bayonet pilot lamps use to
protect the receive circuit of the Yaesu FT-101?

What's the number on them?

That would be easy and a lamp number is one of the first things I looked for
:~) But this lamp only has volts and amps stamped on the base (at least
that is what was embossed. Not all the characters took.). It does have 16v
at 0.15 amps clearly embossed. There is no number in the Yaesu parts list
either.

I have a 1972 Chicago Miniature Lamp catalogue here and I see a lot of 14V
and 18V lamps but nothing in-between.

I'd suggest replacing it with a 14V 0.15V lamp like a 1488 (which is a full-
size bayonet) or a 14V 0.12A mini bayonet like an 1892. That will cause
it to limit current at a lower level than before, but that gives you a
little more safety margin.

I'd be curious how the original one failed, though.
--scott

[Paul P]

Post by Scott Dorsey
I'd be curious how the original one failed, though.
--scott

Mechanical failure.

It looks good but does not conduct. It threw me for a while before I
actually tested it instead of looking at it.

One of the first things they taught me in tech school in the 70's. Ohm out
the lamps and fuses.

Paul P.

[Scott Dorsey]

Post by Paul P

Post by Scott Dorsey
I'd be curious how the original one failed, though.

Mechanical failure.
It looks good but does not conduct. It threw me for a while before I
actually tested it instead of looking at it.
One of the first things they taught me in tech school in the 70's. Ohm out
the lamps and fuses.

I know this sounds weird... but try applying 16V to the thing with a bench
supply and see what happens.

I have seen some lamps that seem to be an open until power is applied
and then they become normal. I don't know what causes it, it's as
if a layer of corrosion built up on a contact somewhere.

Odds are it really IS bad, but five minutes will make sure.
--scott

[JB]

Post by Scott Dorsey

Post by Paul P

Post by Scott Dorsey
I'd be curious how the original one failed, though.

Mechanical failure.
It looks good but does not conduct. It threw me for a while before I
actually tested it instead of looking at it.
One of the first things they taught me in tech school in the 70's. Ohm out
the lamps and fuses.

I know this sounds weird... but try applying 16V to the thing with a bench
supply and see what happens.
I have seen some lamps that seem to be an open until power is applied
and then they become normal. I don't know what causes it, it's as
if a layer of corrosion built up on a contact somewhere.
Odds are it really IS bad, but five minutes will make sure.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

These are ballasts that help to limit the current on the input transformer
winding, or blow if too much. The FT-757 uses a grain-of-wheat bulb tacked
onto the board. It is probably not critical, but it should be noted that
smaller lamps may coat the envelope if they blow hard, leaving them
conductive. Can be a problem with fuses too.

[t***@gmail.com]

Post by Paul P
Can anyone point me to a source for the 16 volt bayonet pilot lamps use to
protect the receive circuit of the Yaesu FT-101?
Thanks,
Paul P.

Automotive Supply Stores carry the Sylvania 1891 LL bulb which is a 14 volt 3.4 watt bulb. You can also order the 606-CM1892 14.4 volt 1.8 watt bulb from Mouser. Either work just fine in the FT-101 series of radios.

[G. Beat]

RossComm based in Fareham, Hampshire (UK) bought out Yaesu EU service inventory a
few years ago. They had hundreds of that part, in stock, at that time.
http://www.rosscomm.co.uk/home

CONTACT them (e-mail) fir details or watch their eBay store front.

gb