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ti an31 opamp guide component question

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PH9Z:
I'm playing around with opamps trying to build the examples from AN31 guide: http://www.ti.com/lit/an/snla140b/snla140b.pdf

My question:  what is q1 in figure 55, same as q1,q2 and q3?
I don't regonize the part.....

regards John

MasterT:
MOSFET.

Audioguru:
Ph9z, I see what is wrong.
The LM102 opamp is obsolete and the 4 terminals Mosfet is also obsolete. Maybe in 1959 a Mosfet had 4 terminals. 

capt bullshot:

--- Quote from: MasterT on November 01, 2018, 09:29:41 pm ---MOSFET.

--- End quote ---
Yes, but a nowadays quite uncommon variant with bulk bonded out. Bulk as opposite of gate, usually internally connected to source.

PH9Z:
THX, I will start playing around with a BF511!

Regards John

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