The Obi ANH Transistors--found? Yes? No?

[juno]

Well then most of them are IC -- lol. And I took a couple of years of electronics in college. Isn't it sad? I'll look again tonight.

 

[Gigatron]

Serafino, I contacted both those places and others earlier this year (jan. or feb. when I was doing my own, independant research) and never got a response from anyone. Either the sites are not maintained/watched after or they just don't care.

But maybe you (or someone else) will have better luck than I...

-Fred

 

[Serafino]

I elect ATL. :lol

Seriously, I would think those guys would be interested in an unidentified transistor. A brief exposition of the mystery in technical terms specifically regarding the lack of relationship to known examples, supplemented by a photo, might do the trick.

ATL thanks for the info. on the Mullards, I should have read more carefully.

 

[Gigatron]

<div class='quotetop'>(Serafino @ Sep 3 2006, 02:11 AM) [snapback]1312055[/snapback]</div>

I elect ATL. :lol

Seriously, I would think those guys would be interested in an unidentified transistor. A brief exposition of the mystery in technical terms specifically regarding the lack of relationship to known examples, supplemented by a photo, might do the trick.

ATL thanks for the info. on the Mullards, I should have read more carefully.
[/b]

Mee too - on both counts :thumbsup :lol

I sent them a picture of the logos in question, what we thought they may have been, other possible theories and even explained that the piece in question was an important part of movie history (though never gave them the details of which movie - I didn't want to see $500 transistors on ebay the following day :lol )

-Fred

 

[ATL Kenobi]

<div class='quotetop'>(juno @ Sep 2 2006, 09:11 PM) [snapback]1312029[/snapback]</div>

Well then most of them are IC -- lol. And I took a couple of years of electronics in college. Isn't it sad? I'll look again tonight.
[/b]

Juno, it's not that sad. If you've recently studied electronics, then you'd probably no more recognize the differences in these packages than I would be able to recognize the difference between a tetrode and a pentode vacuum tube just by looking at them :lol . Packaging technolgy is advancing (shrinking) daily it seems.

In your photo, you do have a number of transistors that start with "2N". These may not be "THE" transisors, but they would work well for most replica sabers. Just cut off the legs, file the bottom flat, drill and tap with an 8-32 bottoming tap, and add a 3/8" long stud. Should look like these:

It seems a number of folks are always looking for them.

<div class='quotetop'></div>

I elect ATL.[/b]

Thanks Serafino, but I don't think I'd be any more persuasive or succesful in getting information than Gigatron. I know oldken has tried too. Now FB seems to be awfully good at finding rare information...... :lol

I have embarked on collecting a complete list of all semiconductors that have a designation that starts with "MA". The list (spreadsheet) so far has 9000 entries. I'll then try and identify which parts were TO-5 or TO-39 cased - mostly single BJTs (transistor) and thyristors. From there, I'll then try to determine manufactures and come up with a list of logos. Although this exercise is already pointing towards one maufacturer :rolleyes , I'll continue till done. This may take awhile.

ATL

 

[Foe Hammer]

Well put me down for a set or two whenever the right ones are found. :lol

 

[Serafino]

OLD THREAD!!

I'm thinking this thread should be archived? I'll PM a mod about that.

Here's a useful summary quote from ATL from a later thread, referring back to this one:

<div class='quotetop'>QUOTE(Sulla @ Dec 3 2006, 03:44 PM) [snapback]1370710[/snapback]</div>
Sulla,

When I started lurking on the RPF, about a year ago, it was already the belief that the buttons were some sort of TO-39 (transistor outline number 39) cased transistors. I don't know the history on how that belief was established, but I accepted that thought, and based on it, I did a rather extensive search of known TO-39 (TO-5 are the same size) transistors that would have part numbers begining with "MA" markings. (BTW - there are over 14,000 semiconductors, i.e. ICs, diodes, varactors, SCRs, transistors, and such, that have designations that begin with "MA", of which about 25 are the correct case size and were available in the mid 70s.) From that information, I tracked down a couple of transistors which are shown here:

Serafino's transistor thread

I agree with Darth Lars that they are Motorola, but because the logos and markings are so badly damaged and obscured, the exact ones may never be found.

THAT SAID - If you've found some other part or device that's the correct size, and has the correct markings on it --- I need 2!

ATL Kenobi

Also BTW - If anyone's actually looking for the previously mentioned transistors, I believe they would be found in circuits that combined both vacuum tubes and transistors, possibly TVs, "Hi FI" stereos, and radio receivers from the mid to late 60s. Perhaps a TV repair shop that's been in business since that time period may have a few dusty specimens sitting on a shelf.

 

[yodaman]

Archived