Unidentified flying... Si transistor

[Luke51411]

I pulled a bunch of these out of an old organ. I can't find any inf on them. The markings are 7348u1916.

[njkmonty]

i wouldnt have a clue but could it be something like ....

2SK1916


found this ...  cv7348
http://www.ebay.com/itm/2N1302-CV7348-GERMANIUM-TRANSISTOR-X10PCS-/310415185980?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item48462fd83c

[UKToecutter]

It might help if you tell us the make and model of the organ.
A lot of manufacturers used 'house' numbers that bear no relation to the actual part number.
However, if you can tell us what organ they are from one of the clever blokes on the forum may be able to help.

Cheers

[Luke51411]

It is a Baldwin c720t

[duck_arse]

it says here:
http://www.organforum.com/forums/showthread.php?20321-Baldwin-720C

BALDWIN C-720T: came out in 1976, I.C. divider tone generation, 32-note pedal board, 2 manuals, self-contained speakers

so, I'd say the "7348" part to be the date code. that just leaves the u1916. possibly micro electronics?

or a house number.

[Luke51411]

With the diode function on my multi meter I get readings when negative lead is hooked to only 1 leg that means it is a pnp correct? The readings are .3 and .74v.

[Luke51411]

Ok they are fets of some kind. How can I tell if they are JFETS or mosfets? What do I need to know to find out if they could be used in  a phaser? Other than matching? Is it just a certain Vgs range they need to fall in?

[amptramp]

The ceramic package with epoxy blob seal was commonly used by Fairchild for transistors and resistor-transistor logic (RTL) beginning in the 1960's.  If the device has three leads, it is a transistor.  If it has eight leads, it is a logic gate.  The level of integration for RTL was one JK flip flop or a dual two-input NAND gate per package.  RTL was supplanted by DTL then TTL and remains available only from places that specialize in obsolete electronics.  The use of this package for transistors has continued, especially for high-frequency devices.

[Luke51411]

They have 3 leads. As it so happens, I just bought an old book on RTL or was it TTL? I can't remember, I'll find out when it gets here. I also bought the CMOS logic cookbook. I have some unknown 16 pin ICs as well pulled from the same organ, they were even socketed! They were on the board near the keys and there were several of the same one,  I'm guessing those are CMOS chips of some kind? At any rate, I'm sure I can find something to do with these transistors