FS: Tek 7904 500 Mhz Scope

Bob Miller

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Dec 21, 1998, 3:00:00 AM12/21/98

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For Sale:

Tektronix 7904 500 Mhz Main Frame. Excellent condition--bright and
crisp CRT. Includes the following plug in units which are also in
excellent condition with nothing broken or munged.
2 each 7A26 Dual Channel Vertical Plug In Units (4 channels altogether)
1 each 7B85 Delayed dual time base plug in
1 each 7B92A 500 Mhz time base plug in
1 each 10X probe
This scope package will do just about everything you could want and
then some. I do not have any docs on the unit, but check with
http://www.w7fg.com for manual copies or Manuals Plus if you want
originals.

$700 ups ground prepaid conus (double boxed versapacked)

Thanks for the read and happy holidays

Bob, KE6F

Bob A

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Dec 21, 1998, 3:00:00 AM12/21/98

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Bob,

Where are you located? Have you used the scope lately? everything ok? Why
only one probe?

Thanks,

Bob A.

nicholas charles caruso

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Dec 22, 1998, 3:00:00 AM12/22/98

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Bob Miller wrote:

> For Sale:
>
> Tektronix 7904 500 Mhz Main Frame. Excellent condition--bright and

So, this is a 7904A? The 7904 is not 500MHz, it's somewhat less. This
looks like a very good deal, BTW, even if it is a non-A 'frame. The non-A
has somewhere in the vicinity of 400MHz BW, I think.

See http://www.caip.rutgers.edu/~kahrs/testeq/7000.html for lots of useful
info on these wonderful scopes.

73
nick caruso KB1DEJ (a satisfied owner of the 7904 (non-A) 'frame)

Robert Koller

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Dec 22, 1998, 3:00:00 AM12/22/98

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The 7904 is indeed 500Mhz, if some don't go out to 500, the vertical amp
has probably been overcompensted. Tek speced them at 500 Mhz and mine has
tested easily at that.

Bob

Bob Miller wrote:

> For Sale:
>
> Tektronix 7904 500 Mhz Main Frame. Excellent condition--bright and

nicholas charles caruso

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Dec 22, 1998, 3:00:00 AM12/22/98

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Robert Koller wrote:

> The 7904 is indeed 500Mhz, if some don't go out to 500, the vertical amp
> has probably been overcompensted. Tek speced them at 500 Mhz and mine has
> tested easily at that.

Perhaps I was misinformed; in any case, I didn't mean to attack the poster or
his sale price, just to clarify. As I said, I think the price quoted is a
great deal whether it's a 7904 or a 7904A.

--ncc

nicholas charles caruso

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Dec 23, 1998, 3:00:00 AM12/23/98

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nicholas charles caruso wrote:

I was indeed misinformed, FWIW; my source said, when queried:

> Well, I'll be hog swaggled. My manual is service only, not usage. Still, in
> the calibration section it distinctly says 500 MHz.

73,
kb1dej

David DiGiacomo

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Dec 24, 1998, 3:00:00 AM12/24/98

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In article <367FAACB...@certco.com>,

nicholas charles caruso <car...@certco.com> wrote:
>Bob Miller wrote:
>
>> For Sale:
>>
>> Tektronix 7904 500 Mhz Main Frame. Excellent condition--bright and
>

>So, this is a 7904A? The 7904 is not 500MHz, it's somewhat less.

This is not correct. Both models have 500MHz bandwidth. The 7904A
chassis has the separate "acquisition" and "display" modules and a
different front panel layout, but otherwise there is not much difference
to the user.

It's hard to say which is preferable -- 7904As are newer and likely to be
in better condition, but it's probably easier to get parts for the 7904
since there are more scrap units out there.

--
David DiGiacomo, San Francisco, CA da...@slack.com