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I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix.
The Tek part number is 150-0045-00.
Does anyone have one that they would like to sell me or can anybody suggest a place
to buy a replacement? The bulb appears to be a custom built bulb and may be pure
un-obtainium. :(

Thanks.

73 de N1FBZ

Sphere says they have 3 new in stock

T1 Based Lamp 150-0045-00 Incandescent Lamp T-1 miniature lamp with base. New in factory bags. 3 New $5.00

I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix. The Tek part number is 150-0045-00. Does anyone have one that they would like to sell me or can anybody suggest a place to buy a replacement? The bulb appears to be a custom built bulb and may be pure un-obtainium.


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Remove the bulb from the green lens assembly and look at the side of the bulb base.

The industry number or CM number is embossed in, or applied, to the metal base.

It is a common bulb.


Rolynn
Tek Bvtn and Sunset 1966-1971

according to TEK cross reference book page 15-4? (like pg 339 of 414 pages)
bulb is #685,, 5V 60ma, 25K hrs .05 MSCP
搁别苍é别

Hi,
This is a 5v, 0.06A bulb. It is a T-1 type sub-midget flange bulb and its "common" number is 685. You can buy one made by VCC from Mouser at $US 1.09 (or 0.869 Euro if you prefer Mouser Europe).
Colin.

At 09:48 AM 6/18/2018, Michael Gladu wrote:

I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix.
The Tek part number is 150-0045-00.

The 1982 CDPC shows it as a number 685, aka CM685 (5V, .06A, .05MSCP, 25k hours). It is available from Mouser, Digikey and many others.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

Definitely Obtainium. Available at Mouser and Digikey for a dollar or two, and at BulbTown for fifty cents.

Dave Wise
________________________________________
From: [email protected] <[email protected]> on behalf of 搁别苍é别 <k6fsb.1@...>
Sent: Monday, June 18, 2018 12:14 PM
To: [email protected]
Subject: Re: [TekScopes] Tektronix 453 Power Indicator Bulb needed

according to TEK cross reference book page 15-4 (like pg 339 of 414 pages)
bulb is #685,, 5V 60ma, 25K hrs .05 MSCP
搁别苍é别

On 2018-06-18 12:03 PM, ROLYNN PRECHTL K7DFW wrote:

I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix. The Tek part number is 150-0045-00. Does anyone have one that they would like to sell me or can anybody suggest a place to buy a replacement? The bulb appears to be a custom built bulb and may be pure un-obtainium.

Thank you to everyone that took the time to reply to my message.

I had no idea that the bulb was in a bulb holder! I should have looked closer.

Thanks once again!

73 de N1FBZ

On 2018-06-18 5:38 PM, Michael Gladu via Groups.Io wrote:

Thank you to everyone that took the time to reply to my message.

I had no idea that the bulb was in a bulb holder! I should have looked closer.

Thanks once again!

Pardon me if this is a dumb question, but why is there no interest in
replacing the bulb with LED?

--Toby

73 de N1FBZ

T’would be an easy proposition... if I need to replace one in my 453, that’s what I will do.

Phil, N6OMM

At 10:13 PM 6/18/2018, Toby wrote:

... why is there no interest in replacing the bulb with LED?

Probably because the lamps are cheap, easily available, and a lot less work.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

On 2018-06-19 6:21 AM, Dale H. Cook wrote:

At 10:13 PM 6/18/2018, Toby wrote:

... why is there no interest in replacing the bulb with LED?

Probably because the lamps are cheap, easily available, and a lot less
work.

I get that, but the lamp is still a consumable that will wear out again.
How much extra work would a LED specifically be?

(I own a 453 fwiw)

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

I get that, but the lamp is still a consumable that will wear out again.

==========================================================

A 386 lamp has a MTBF of 15,000 or 40,000 hours depending on what data sheet you look at.

How many hours do you operate your 453 in a lifetime?


Rolynn
Tek Bvtn and Sunset 1966-1971

On 2018-06-19 1:40 PM, ROLYNN PRECHTL K7DFW wrote:

I get that, but the lamp is still a consumable that will wear out again.

==========================================================

A 386 lamp has a MTBF of 15,000 or 40,000 hours depending on what data sheet you look at.

How many hours do you operate your 453 in a lifetime?

You do make an excellent point, although I expect they are somewhat more
sensitive to environmental conditions, temp, vibration, shock and so on.

That said I'm not planning on operating mine on an active volcano either.

--Toby

Rolynn
Tek Bvtn and Sunset 1966-1971

At 11:33 AM 6/19/2018, Toby wrote:

I get that, but the lamp is still a consumable that will wear out again. How much extra work would a LED specifically be?

I value what I do to my own electronics in terms of my bench labor rate. What the LED conversion would cost in terms of my shop labor rate would probably pay for replacing the lamp several times over.

People who work on electronics for a hobby, rather than for a living as I do, may value their shop time differently.

Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA

At 01:40 PM 6/19/2018, Rolynn wrote:

A 386 lamp has a MTBF of 15,000 or 40,000 hours depending on what data sheet you look at.

How many hours do you operate your 453 in a lifetime?

I have owned my 453 for about twenty years, and have lost track of the number of hours that I've used it. I have never had to replace a lamp.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

The problem with replacing the small light bulbs with LEDs is that one is almost never a drop-in replacement. You can do it, but have to make some changes to accommodate the differences in supply voltage/current source, AC vs DC, variableness, mechanical fit and mounting, wiring, and light pattern, for example. It's often just easier and simpler to put in new bulbs and be done with it, even though more technically advanced, permanent solutions are available.

I once made an LED graticule illumination assembly to try out in 7K scopes. I found some sort of omni-directional "white" LEDs from a light string, and tacked them into bases from some burned out bulbs, so they could socket the same way, on the original circuit board. I made some simple mods to the driving circuits, and it lit up nicely, with variable and everything. It was hard to tell they weren't the original bulbs in there. Then I tried a screen shot with a digital camera. The resulting pictures showed the traces OK, but hardly any illumination - the LED's whitish phosphor spectrum was not aligned with the camera's response, so even though it was OK visually, it didn't technically work for a common application. Sometimes the particulars of the LED color matter. For just visual lighting or indicating, this would not be a big deal.

Ed