The Last PL400 Made?

[mlucitt]

Here is a picture of a factory fully complementary PL400 from a customer in Australia. It appears to be made in 1983, the last year of the Phase Linear name before they became purely automotive components. This was during the time they were owned by Jensen, which began in 1982.
I am assuming that the fully comp amplifiers were only made under Jensen engineering direction from 1982-1983 because the price of PNP transistors had finally come down to the point where they were about the same as NPN transistors, but I have no reference for that, just a guess.

Anyway, has anyone seen a serial number on a PL400 higher than 4A-32199?

 

[MarkWComer]

Any stickers on the inside?

 

[Gepetto]

Any stickers on the inside?

Just the round circle label that says 'Mark'

 

[George S.]

Mark, what do you think think the small "181" sticker represents?

 

[MarkWComer]

Mark, what do you think think the small "181" sticker represents?

No idea…

 

[MarkWComer]

I meant something like this, found inside the original case of my 700.

 

[mlucitt]

Mark C, there is a sticker, but I cannot read it from the customer's photograph:


Pretty sure this is a Jensen era PL amp.

Oh, the "181" sticker is probably just an inventory sticker from the vendor, not Phase Linear/Jensen.