Old Tandy power transistors

Nov 17, 2005 4 Replies

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David Nicholls 20 years ago

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

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Franc Zabkar 20 years ago

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

formatting link

276-2027 = NTE153 RS2019 = NTE331 RS2027 = NTE332

-- Franc Zabkar

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

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Phil Allison 20 years ago

"David Nicholls"

** 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 20 years ago

Thanks, Franc.

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David Nicholls 20 years ago

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

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

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