HP 4333 -- haven't seen this one before

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on EBay -- first time I have seen one -- seems to be a precedent model to the 339 distortion analyzer -- without an oscillator, and some auto-frequency detector. the seller misstates the lower threshold of measurement -- it is actually 10X better than advertised.
 

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Hmmm. New to me and I thought I knew them all. Based
on the model number I'd GUESS that it's the measurement
section of a 333, but I could be mistaken. Sure has a different
look and really different knobs. Wouldn't be the measurement
section of a 339?? After all, they split off the oscillator
separately.

Is there a serial number? That could indicate roughly when
it was made. Also, it would give the country of origin
 
Blowing up the rear picture from Ebay, it looks to me like
it says "Yokogawa Hewlett Packard" on the next-to-bottom
line and "Tokyo, Japan" on the bottom line. It's not that
clear, but I know what the different serial labels should
look like. I don't think it says "Hewlett-Packard GMBH"
or "Boeblingen Germany"

It's not listed in my 1984 HP catalog, so it was obsolete
by then.

So this scanty data indicates it may have been an odd-ball
product produced by YHP.

It probably works just fine, and might be useful (be sure they
give you a service manual). Personally, I find something like
a 339A to be much easier to use as it locks the source
and analyzer frequencies for much faster/easier reading.
(though that "auto fine" button may engage the servo tuning)

BTW, a Google search brings up no useful information.
 
YHP 4333A

Hello. The equipment is made by YHP in Japan. This is just a distortion meter without oscillators. I have one at home.
This is far better than 433 in view of high resolution and stability. I have a copy of the reference manual, but it is in Japanese. :)
I had to wait for more than a year to get the copy from one of my friends of YHP.
Best regards.
 
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