I sent a message that I wanted the scope
and coppied me with the email, but have not received it, so
I am resending it.

Derward Myrick  KD5WWI




----- Original Message ----- 
From: "Sean Breheny" <shb7@cornell.edu>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Sunday, April 20, 2008 7:40 PM
Subject: [EE]: Free (for the cost of shipping) Oscilloscope


> Hi all,
>
> I have an old (probably late 1970s) Tektronix 7704A oscilloscope,
> similar to the one shown here:
>
> http://www.helmut-singer.de/img/tek7704kompl.jpg
>
> I bought it used in 1998 and it served as my main scope until I got a
> DSO in 2005. I've had to do minor repairs several times (twice a
> capacitor failed shorted and had to be replaced, and once the
> horizontal deflection transistors failed and I had to replace them).
>
> I would like to give this to someone who is willing to pay shipping
> for it. In total, you'd be looking at a box weight of something like
> 40 lbs and dimensions of about 36 inches by 20 by 20. Roughly UPS
> Ground for this within the US is between $40 and $100 depending on
> destination and how small I can safely make the box. International
> rates would probably be prohibitive but I'd be willing to try if you
> want.
>
> Alternatively, if you live near Boston, MA, you could pick it up at my
> workplace.
>
> The specs and details are below. I will choose from among the emails I
> get. Please email me if you are interested and explain why you want
> this scope. I'd rather do it this way than "first come first serve"
> because time zones may cause some to see it before others.
>
> - 200MHz Analog Scope
> - Up to quad trace, depending on plugins
> - Comes with one working 7A26 dual-channel vertical amp, one
> non-working 7A26, one working 7B53 horizontal timebase, and one set of
> 7B80/7B85 timebases (untested)
> - Presently working, nice bright CRT, probably going to have small
> component failures every few months considering its age.
> - With the plugins provided, it can be at least dual trace (quad if
> you can get the second 7A26 working, or buy one on eBay or similar),
> and do holdoff, delayed sweep, intensified/magnified sweep.
> - On screen readout of present settings.
> - Vertical sensitivity down to 5mV per division. Horizontal to 5ns per
> div (7B53) or 1ns/div (7B80/7B85)
> - Comes with service manual for the scope mainframe itself (not for the 
> plugins)
> - Comes with two cheap aftermarket 100MHz probes
> - Can be used as a display for the various Tek 7000 series spectrum
> analyzer plugins
> - All transistors and ICs except for CRT itself.
> - Note that it is bulky and heavy (Roughly 12x12x24 inches and 30
> lbs). Not really portable.
>
> This scope is great for analog electronics work. It can be used for
> PIC debugging although bear in mind that it has no storage abilities.
> You CAN, however, adjust the delay time between trigger and sweep so
> you can see, for example, individual bits in a serial datastream, BUT
> only if they are not changing much over time.
>
> I don't have a photo offhand but I can send one if people would like.
> I'd prefer payment for shipping via Paypal but we can work something
> else out if needed.
>
> Thanks,
>
> Sean
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