Old Tandy power transistors

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David Nicholls - 17 Nov 2005 06:57 GMT

I have in my parts collection what look like a complementary pair of
power transistors, of Tandy origin, from years ago, part numbers RS2019
and RS2027.

I can find reference to the 2027 being an MJE34 but I can't identify the
RS2019. Same package and if they are complementary the hFE's measure
around 70. The packages appear to be TO127's. Does anyone have a
look-up list that will identify the 2019 (presumably Tandy part number
276-2019) and the 2027 (276-2027)?

I want to use them in place of a TIP29 and TIP30 in a power supply
circuit (ca. 1975 vintage) and I'd like to check that the two I have
will do the job.

TIA

DN

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Franc Zabkar - 17 Nov 2005 19:27 GMT

On Thu, 17 Nov 2005 17:57:38 +1100, David Nicholls
<nichollsatu030dotaonedotnetdotau> put finger to keyboard and
composed:

>I have in my parts collection what look like a complementary pair of
>power transistors, of Tandy origin, from years ago, part numbers RS2019
[quoted text clipped - 13 lines]
>
>DN

http://www.nteinc.com/specs/100to199/NTE152.html
http://www.nteinc.com/specs/300to399/NTE331.html

276-2027 = NTE153
RS2019 = NTE331
RS2027 = NTE332

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

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David Nicholls - 18 Nov 2005 05:36 GMT

> On Thu, 17 Nov 2005 17:57:38 +1100, David Nicholls
> <nichollsatu030dotaonedotnetdotau> put finger to keyboard and
[quoted text clipped - 27 lines]
>
> -- Franc Zabkar

Thanks, Franc.

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Phil Allison - 17 Nov 2005 22:05 GMT

"David Nicholls"

> I can find reference to the 2027 being an MJE34 but I can't identify the
> RS2019. Same package and if they are complementary the hFE's measure
> around 70. The packages appear to be TO127's.

** Gawd - the TO127 package is as old as the hills.

The first example I saw was an 8 amp SCR, the 2N4443 as used in the
Playmaster 128 stereo power amplifier ( Jan 1970) PSU overcurrent trip cct.

Then the popular MJE3055 and MJE2955 output pair ( no T on the end ).

Looks like a BD139 on steroids.

They had gold plated legs too.

........ Phil

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David Nicholls - 18 Nov 2005 05:38 GMT

> "David Nicholls"
>
[quoted text clipped - 3 lines]
>
> ** Gawd - the TO127 package is as old as the hills.

They've been in my parts box since 1985 at least, maybe earlier.

> The first example I saw was an 8 amp SCR, the 2N4443 as used in the
> Playmaster 128 stereo power amplifier ( Jan 1970) PSU overcurrent trip cct.
[quoted text clipped - 4 lines]
>
> They had gold plated legs too.

That's them. And the terminals are nicely impressed with B C E, too.

DN

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Electronics Forum / Electronics / November 2005

Old Tandy power transistors