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Howdy all-

With all the talk of TEK samplers and the mention of the 7S14, I
wonder what are we 7S14 owners to do these days when it comes to
replacing the bias batteries in the 7S14?

I gather that the merc oxide batteries originally spec'ed are no
longer available. Is the 1.35V merc oxide batt voltage that strict a
spec in the 7S14?

Thoughts?


-Vollumscope

At 12:39 PM 3/4/2004 , vollumscope wrote:

With all the talk of TEK samplers and the mention of the 7S14, I
wonder what are we 7S14 owners to do these days when it comes to
replacing the bias batteries in the 7S14?

Funny, I was going to ask if there were any symptoms of weak cells.
Anything to watch out for?


newell

Does anyone have a digitized manual...?

At 02:43 PM 3/4/2004 , Michael Dunn wrote:

Does anyone have a digitized manual...?

Yes.


newell

I have two of these units. One has a bad battery
but the other one is still working fine after 25 years!
Dennis

With all the talk of TEK samplers and the mention of the 7S14, I wonder what are we 7S14 owners to do these days when it comes to replacing the bias batteries in the 7S14? I gather that the merc oxide batteries originally spec'ed are no longer available. Is the 1.35V merc oxide batt voltage that strict a spec in the 7S14?

The only kind of mercury cells I can find can be seen at


I have ordered cells from here before for my older Rollei SLR light meter. The cells I received appeared to be of Mexican origin.

These appear to be available for a short time. Perhaps an button cell adapter is in order.

The loss of mercury cells has caused an impact on both the older camera and the Bulova Accutron wristwatch collector community (the watches use #343 or #387 cells, which have been unobtainable for several years now). I will spare the list from listening to a rant about environmentalists ;). Your tax dollars at work.

I refurbished an old Simco electrostatic voltmeter that used mercury cells for both a reference and a differential opamp supply. I ended up making some postage stamp PCBs incorporating some Linear Technology micropower regulators that allowed me to generate the needed voltages from alkaline cells.

-Dan

Ask NR1DX, He Often Has The Disc On His E-Bay Auction. Just Search By Single Seller, And Enter NR1DX. Has Quality Scans Available.

Greyhawk

The 7S14 batteries have a voltage of 1.35 volts, New silver oxide
batteries are about 1.55 volts. You can replace these mercury types
safely with silver oxide types in a 7S14. I have done this about a
year ago and worked perfectly. Empty or nearly empty batteries
showed on mine an increased noise band (mind you they where not
complete dead).

After replacemend I did a recal on the unit, especially the
avalanche voltage, loop gain, DC bal and MEM bal are affecting the
noise.

Fred de Vries

You can download the instruction Manual from TekNet at
<>. You need to sign up but they seem to be
OK. Click on the manual panel on the left of their web site and follow the
instructions. You can only download 5 manuals per month. The file is large,
25 Mbytes so s fairly complete.
Don Black.

Michael Dunn wrote:

At 12:22 AM +1100 2004/3/6, jeans wrote:

You can download the instruction Manual from TekNet at
<>. You need to sign up but they seem to be

Thanks! I've added their URL to our Links page. I'd advise any members who haven't checked out that page to do so sometime. Lots of good stuff...

Michael

Hi Everybody,

I was eager to check out the teknetelectronics site Jeans wrote about:

in hopes I could find a few of the really rare manuals I still haven't
been able to locate for my collection. But the site is a bit of a
disappointment. The quantity is there but the quality is lacking.

When you sign up for the free 30 day trial you can download 5 manuals.
But unfortunately you get what you pay for. They are free. But if the
three Tek manuals I chose to download are any indication of the overall
quality of the site I would not be willing to pay for a subscription.

The manuals I downloaded were incomplete and disorganized as if whoever
scanned them was not paying attention to what they were doing.

Personally I prefer paper. Its much easier to grasp the big picture
with a paper manual and as far as I know no one has yet to come up with
a good way to scan the foldout pages.

For those people who prefer their manuals in PDF format I would suggest
buying from one of the people selling them like that on eBay. The eBay
sellers have more of an interest in maintaining their reputation for
doing a quality scanning job.

Dennis

I was eager to check out the teknetelectronics site Jeans wrote about:

in hopes I could find a few of the really rare manuals I still haven't
been able to locate for my collection. But the site is a bit of a
disappointment. The quantity is there but the quality is lacking.

When you sign up for the free 30 day trial you can download 5 manuals.
But unfortunately you get what you pay for. They are free. But if the
three Tek manuals I chose to download are any indication of the overall
quality of the site I would not be willing to pay for a subscription.

My understanding is that 'membership' is free. They never collected any fees
from me, did not even try to. Keep in mind that company is in rental
business and purpose of this site is to substitute missing operating
manuals. No rental customer repairs or calibrates equipment and I was
surprised to find any service manuals. I guess, those are the ones that
leaked through the system.

The manuals I downloaded were incomplete and disorganized as if whoever
scanned them was not paying attention to what they were doing.

I would say, there is no 'as if', guy who ran paper through the scanner did
not care what came out as long as it was any kind of image. Since I am into
guessing business, I would say that scanning was done by a service company
and when customer asked why pages are not aligned they told him that can be
done, too, but price is triple.

As for incomplete manuals, I would guess that parts were omitted to save the
cost. As I already said, those manuals are intended for rental customers to
use as operating instructions. Few manuals that have schematics,
surprisingly one for 7S14 does, are possibly early scans, before accountants
got billing for scans or ones that leaked through the system.

Personally I prefer paper. Its much easier to grasp the big picture
with a paper manual and as far as I know no one has yet to come up with
a good way to scan the foldout pages.

I would be very hard pressed to argue differently, even when talking about
good scans, like ones available on e bay, but for something that I would
just glance at, like things that I do not own but am curious about circuit,
scans would have to do. Any kind of a small paper manual (e.g. for plug-in)
is upward from $10, frequently $20 and that makes it an expensive
proposition.

As for good way to scan fold out sheets, there is a claim by one e bay
vendor that he has a scan of the whole page and if printed at the place that
can handle B size paper, fold out sheets are usable. Have not seen any of
those schematics, just saw vendor's claim.

Regards

Miroslav Pokorni