ID of Old Transistor

N

Norm Dresner

Guest
NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75") heat
sink.

I'm trying to find out if the heat sink is worth more than the transistor.

TIA

Norm
 
On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net>
wrote:

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75") heat
sink.

I'm trying to find out if the heat sink is worth more than the transistor.
Click to expand...
---
Auction 'em off on ebay and get some empirical evidence...

--
John Fields
 
On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net>
wrote:

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75") heat
sink.

I'm trying to find out if the heat sink is worth more than the transistor.

TIA

Norm
Click to expand...
Bendix made power transistors in the far past. Put it on a checker
(or curve tracer) and see if it works.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
In article <CYhKc.272724$Gx4.267501@bgtnsc04-news.ops.worldnet.att.net>,
Norm Dresner <ndrez@att.net> wrote:
NPN TO-3
It says

Bendix
3330
USA 1012
6752B
Click to expand...
Would you trust a transistor made between Xmas and New Years?


Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75") heat
sink.

I'm trying to find out if the heat sink is worth more than the transistor.
Click to expand...
Looking in my 1968 Newark catalog, Bendix transistors are either
standard 2N numbers, or B-170000 series. Most of the 2N stuff looks to
be Germanium.

Mark Zenier mzenier@eskimo.com Washington State resident
 
"Jim Thompson" <thegreatone@example.com> wrote in message
news:8a8lf09ohmff76lljlgeiujq7emdllvfmq@4ax.com...
On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net
wrote:

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75")
heat
sink.

I'm trying to find out if the heat sink is worth more than the
transistor.

TIA

Norm

Bendix made power transistors in the far past. Put it on a checker
(or curve tracer) and see if it works.
Click to expand...
It passed the Diode Checker B-E & B-C. I haven't gotten to the Hfe tester
yet but I will.

It's definitely Si. .602 & .598 V drops.

Norm
 
"Norm Dresner" <ndrez@att.net> wrote in message
news:6TCKc.279042$Gx4.233393@bgtnsc04-news.ops.worldnet.att.net...
"Jim Thompson" <thegreatone@example.com> wrote in message
news:8a8lf09ohmff76lljlgeiujq7emdllvfmq@4ax.com...
On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net
wrote:

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75")
heat
sink.

I'm trying to find out if the heat sink is worth more than the
transistor.

TIA

Norm

Bendix made power transistors in the far past. Put it on a checker
(or curve tracer) and see if it works.

It passed the Diode Checker B-E & B-C. I haven't gotten to the Hfe tester
yet but I will.

It's definitely Si. .602 & .598 V drops.

Norm

I'd guess it's a 2N6752B power trannie, but like I said, it's a guess.
Click to expand...

Ken
 
"Ken Taylor" <ken123@xtra.co.nz> wrote in message
news:2m0kv6FhhmnpU1@uni-berlin.de...
"Norm Dresner" <ndrez@att.net> wrote in message
news:6TCKc.279042$Gx4.233393@bgtnsc04-news.ops.worldnet.att.net...
"Jim Thompson" <thegreatone@example.com> wrote in message
news:8a8lf09ohmff76lljlgeiujq7emdllvfmq@4ax.com...
On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net
wrote:
NPN TO-3
It says
Bendix
3330
USA 1012
6752B
Got it in a bag of Voltage Regulators mounted to a small
(2"x3.5"x.75") heat
sink.
I'm trying to find out if the heat sink is worth more than the
transistor.
TIA
Norm

Bendix made power transistors in the far past. Put it on a checker
(or curve tracer) and see if it works.

It passed the Diode Checker B-E & B-C. I haven't gotten to the Hfe
tester
yet but I will.

It's definitely Si. .602 & .598 V drops.

Norm

I'd guess it's a 2N6752B power trannie, but like I said, it's a guess.
Click to expand...
Well, NTE's sub for it, NTE2319, is given an Hfe of 5 and two totally
different DMM's measure Hfe as 3, though at a vastly lower current than the
NTE spec an unspecified, but presumably much higher current than my DMMs
use. Semi-Tech gives an Hfe of 8 at 5.0 A about 3 orders of magnitude
higher than the meters. My Motorola power transistor book from '78 shows
curves for Hfe where the values at ~.01A are half of the peak. Again, this
correlates with the measurements and specs.

The real test, I guess, would be to check (at least grossly) Vceo which, for
the 2N6752, is shown as 850V. Since I have no real use for this type
transistor and a replacement is currently selling for around $1.50 to $2.50,
I think I'll stop here and assume that's what it is. I don't think it would
pay to try to sell it on eBay.

Thanks.

Norm
 
Ken Taylor wrote:
"Norm Dresner" <ndrez@att.net> wrote in message
news:6TCKc.279042$Gx4.233393@bgtnsc04-news.ops.worldnet.att.net...

"Jim Thompson" <thegreatone@example.com> wrote in message
news:8a8lf09ohmff76lljlgeiujq7emdllvfmq@4ax.com...

On Sat, 17 Jul 2004 22:43:46 GMT, "Norm Dresner" <ndrez@att.net
wrote:
Click to expand...

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75")

heat sink.

I'm trying to find out if the heat sink is worth more than the

transistor.

TIA

Norm

Bendix made power transistors in the far past. Put it on a checker
(or curve tracer) and see if it works.

It passed the Diode Checker B-E & B-C. I haven't gotten to the Hfe tester
yet but I will.

It's definitely Si. .602 & .598 V drops.

Norm
Click to expand...

I'd guess it's a 2N6752B power trannie, but like I said, it's a guess.

Ken
Click to expand...
It's definitely not a 2N6752B, because when Bendix got out of that
business, the 2N numbers weren't even up to that high a number. That's
the date code, most likely. Bendix made silicon power transistors, and
I have a Bendix catalog at home. But that number doesn't ring a bell,
so it's most likely a house number. And that long ago, the betas of
silicon power transistors was not very high, maybe less than 40. So
it's not a very good candidate for use in a modern design.
 
Mark Zenier wrote:

In article <CYhKc.272724$Gx4.267501@bgtnsc04-news.ops.worldnet.att.net>,
Norm Dresner <ndrez@att.net> wrote:

NPN TO-3
It says

Bendix
3330
USA 1012
6752B

Would you trust a transistor made between Xmas and New Years?
Click to expand...
I would agree with you if the transistors were made by humans, but since
it's more than likely that a human had little to do with the automated
processes, then I don't see why that particular datecode would be worse.

Got it in a bag of Voltage Regulators mounted to a small (2"x3.5"x.75") heat
sink.

I'm trying to find out if the heat sink is worth more than the transistor.
Click to expand...

Looking in my 1968 Newark catalog, Bendix transistors are either
standard 2N numbers, or B-170000 series. Most of the 2N stuff looks to
be Germanium.
Click to expand...
Yeah, I think the Bendix catalog that I've got shows things similarly.
Also, some of the silicon stuff comes in odd packages like the package
for the 2N1016B, I forget the TO-xxx number of it.

> Mark Zenier mzenier@eskimo.com Washington State resident
 
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