From: glydeck@...
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Saturday, May 19, 2012, 6:31 PM

?

The link was broken with a carriage return. ?Try this;

http://xa.yimg.com/kq/groups/2191247/2021419648/name/Testing%20Vacuum%20Tubes%20with%20a%20Tek%20Model%20576%20Semiconductor%20

glydeck@...

-----Original Message-----
From: jimafm
To: TekScopes
Sent: Sat, May 19, 2012 12:40 pm
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

?

--- In , "c1ferrari" wrote:
>
>
>
> Happy New Year, all,
>
> Just wanted to report this article is unavailable on the web.
> When I re-discover, LOL, the info pertaining to power supplies -- I'll post.
>
> Best regards,
> Sam
>
> --- In , "c1ferrari" wrote:
> >
> >
> >
> > Hey Craig,
> >
> > Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some suggestions for the necessary power supplies.
> >
> > Next for your stable...Tek 570 or 370, Craig? ;-)
> >
> > Season's Greetings,
> >
> > Sam
> >
> > --- In , "Craig Sawyers" wrote:
> > >
> > > Interesting article, Sam.
> > >
> > >
> > >
> > > I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular
> > > 575 too).
> > >
> > >
> > >
> > > The key benefit of the 577 as compared with the much older 575 is that it
> > > was designed after the FET became common - hence the step amplifier on the
> > > 577 goes up to 2V per step as compared with 0.2V per step for the 575. It
> > > also (as the article points out) has a much wider range of voltage and
> > > higher current capability than the 575 - or the 570 for that matter.
> > >
> > >
> > >
> > > However, to be fully featured, it still needs a step amplifier to get to the
> > > 10V/step needed for some of the more esoteric (audio) valves like the 300B,
> > > and the characteristic curves for things like the KT88 call for 5V steps.
> > > And a screen grid supply is also needed whatever tracer is used. And
> > > although the formal definition gm is a limit (dIa/dVg at constant Va), and
> > > that most tube testers measure with a 1V grid voltage step, you can get a
> > > surprisingly accurate result by measuring between grid voltage steps and
> > > doing the calculation on that basis. Or use the measurement method in the
> > > paper Sam attached, which should be as accurate as the calibration of the
> > > tracer.
> > >
> > >
> > >
> > > But (given screen grid and heater supplies) it is easier to do most small
> > > signal and some power tubes with a 577 as compared with a 575mod122C for
> > > sure.
> > >
> > >
> > >
> > > Craig
> > >
> > >
> > >
> > > PS it would be good to get a link to the article including the diagrams
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: [mailto:] On Behalf
> > > Of Sam Lucero
> > > Sent: 23 December 2011 02:33
> > > To:
> > > Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576
> > > Semiconductor Curve Tracer... [1 Attachment]
> > >
> > >
> > >
> > > [Attachment(s) from Sam Lucero included below]
> > >
> > >
> > >
> > >
> > > manuscript courtesy of its author, Daniel Schoo, is available, here, in pdf
> > > format. Please note photos have been omitted due to bandwidth requirement.
> > >
> > > Daniel furnishes the article on the condition it be distributed and
> > > reproduced with it's original content unchanged with no editing.
> > > An accompanying article on the Tek 577 appears with it.
> > >
> > > Enjoy and Happy Holidays!
> > >
> > > Sam
> > >
> > >
> > >
> > >
> > >
> > > Attachment(s) from Sam Lucero
> > >
> > > 1 of 1 File(s)
> > >
> > > <>
> > >
> > >
> > > <
> > > es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes
> > > with a Tek Model 576 Semiconductor Curve Tracer.pdf
> > >
> >
>
The links don't work. Am I missing something?

Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?

?

I'm still unable to open.? My PC keeps telling me it is an unknown file type. ? Can you direct me to a program that will open the link? ? Thanks again, ? Jim --- On Sat, 5/19/12, glydeck@... <glydeck@...> wrote: From: glydeck@... <glydeck@...> Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer... To: TekScopes@... Date: Saturday, May 19, 2012, 6:31 PM ? The link was broken with a carriage return. ?Try this; glydeck@... -----Original Message----- From: jimafm <jimafm@...> To: TekScopes <TekScopes@...> Sent: Sat, May 19, 2012 12:40 pm Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer... ? --- In , "c1ferrari" > > > > Happy New Year, all, > > Just wanted to report this article is unavailable on the web. > When I re-discover, LOL, the info pertaining to power supplies -- I'll post. > > Best regards, > Sam > > --- In , "c1ferrari" wrote: > > > > > > > > Hey Craig, > > > > Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some suggestions for the necessary power supplies. > > > > Next for your stable...Tek 570 or 370, Craig? ;-) > > > > Season's Greetings, > > > > Sam > > > > --- In , "Craig Sawyers" wrote: > > > > > > Interesting article, Sam. > > > > > > > > > > > > I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular > > > 575 too). > > > > > > > > > > > > The key benefit of the 577 as compared with the much older 575 is that it > > > was designed after the FET became common - hence the step amplifier on the > > > 577 goes up to 2V per step as compared with 0.2V per step for the 575. It > > > also (as the article points out) has a much wider range of voltage and > > > higher current capability than the 575 - or the 570 for that matter. > > > > > > > > > > > > However, to be fully featured, it still needs a step amplifier to get to the > > > 10V/step needed for some of the more esoteric (audio) valves like the 300B, > > > and the characteristic curves for things like the KT88 call for 5V steps. > > > And a screen grid supply is also needed whatever tracer is used. And > > > although the formal definition gm is a limit (dIa/dVg at constant Va), and > > > that most tube testers measure with a 1V grid voltage step, you can get a > > > surprisingly accurate result by measuring between grid voltage steps and > > > doing the calculation on that basis. Or use the measurement method in the > > > paper Sam attached, which should be as accurate as the calibration of the > > > tracer. > > > > > > > > > > > > But (given screen grid and heater supplies) it is easier to do most small > > > signal and some power tubes with a 577 as compared with a 575mod122C for > > > sure. > > > > > > > > > > > > Craig > > > > > > > > > > > > PS it would be good to get a link to the article including the diagrams > > > > > > > > > > > > > > > > > > > > > > > > From: [mailto:] On Behalf > > > Of Sam Lucero > > > Sent: 23 December 2011 02:33 > > > To: > > > Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576 > > > Semiconductor Curve Tracer... [1 Attachment] > > > > > > > > > > > > [Attachment(s) from Sam Lucero included below] > > > > > > > > > > > > > > > manuscript courtesy of its author, Daniel Schoo, is available, here, in pdf > > > format. Please note photos have been omitted due to bandwidth requirement. > > > > > > Daniel furnishes the article on the condition it be distributed and > > > reproduced with it's original content unchanged with no editing. > > > An accompanying article on the Tek 577 appears with it. > > > > > > Enjoy and Happy Holidays! > > > > > > Sam > > > > > > > > > > > > > > > > > > Attachment(s) from Sam Lucero > > > > > > 1 of 1 File(s) > > > > > > <> > > > > > > > > > < > > > es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes > > > with a Tek Model 576 Semiconductor Curve Tracer.pdf > > > > > > The links don't work. Am I missing something? Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?

From: glydeck@...
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Sunday, May 20, 2012, 4:29 PM

?

Jim,

Let me know if this works....

http://dl.dropbox.com/u/27593700/Testing_Vacuum_Tubes_with_a_Tek576.pdf

glydeck@...

-----Original Message-----
From: Jim Elliott
To: TekScopes
Sent: Sat, May 19, 2012 3:54 pm
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

?

I'm still unable to open.? My PC keeps telling me it is an unknown file type. ? Can you direct me to a program that will open the link? ? Thanks again, ? Jim --- On Sat, 5/19/12, <> wrote: From: <> Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer... To: Date: Saturday, May 19, 2012, 6:31 PM ? The link was broken with a carriage return. ?Try this; -----Original Message----- From: jimafm <> To: TekScopes <> Sent: Sat, May 19, 2012 12:40 pm Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer... ? --- In , "c1ferrari" wrote: > > > > Happy New Year, all, > > Just wanted to report this article is unavailable on the web. > When I re-discover, LOL, the info pertaining to power supplies -- I'll post. > > Best regards, > Sam > > --- In , "c1ferrari" wrote: > > > > > > > > Hey Craig, > > > > Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some suggestions for the necessary power supplies. > > > > Next for your stable...Tek 570 or 370, Craig? ;-) > > > > Season's Greetings, > > > > Sam > > > > --- In , "Craig Sawyers" wrote: > > > > > > Interesting article, Sam. > > > > > > > > > > > > I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular > > > 575 too). > > > > > > > > > > > > The key benefit of the 577 as compared with the much older 575 is that it > > > was designed after the FET became common - hence the step amplifier on the > > > 577 goes up to 2V per step as compared with 0.2V per step for the 575. It > > > also (as the article points out) has a much wider range of voltage and > > > higher current capability than the 575 - or the 570 for that matter. > > > > > > > > > > > > However, to be fully featured, it still needs a step amplifier to get to the > > > 10V/step needed for some of the more esoteric (audio) valves like the 300B, > > > and the characteristic curves for things like the KT88 call for 5V steps. > > > And a screen grid supply is also needed whatever tracer is used. And > > > although the formal definition gm is a limit (dIa/dVg at constant Va), and > > > that most tube testers measure with a 1V grid voltage step, you can get a > > > surprisingly accurate result by measuring between grid voltage steps and > > > doing the calculation on that basis. Or use the measurement method in the > > > paper Sam attached, which should be as accurate as the calibration of the > > > tracer. > > > > > > > > > > > > But (given screen grid and heater supplies) it is easier to do most small > > > signal and some power tubes with a 577 as compared with a 575mod122C for > > > sure. > > > > > > > > > > > > Craig > > > > > > > > > > > > PS it would be good to get a link to the article including the diagrams > > > > > > > > > > > > > > > > > > > > > > > > From: [mailto:] On Behalf > > > Of Sam Lucero > > > Sent: 23 December 2011 02:33 > > > To: > > > Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576 > > > Semiconductor Curve Tracer... [1 Attachment] > > > > > > > > > > > > [Attachment(s) from Sam Lucero included below] > > > > > > > > > > > > > > > manuscript courtesy of its author, Daniel Schoo, is available, here, in pdf > > > format. Please note photos have been omitted due to bandwidth requirement. > > > > > > Daniel furnishes the article on the condition it be distributed and > > > reproduced with it's original content unchanged with no editing. > > > An accompanying article on the Tek 577 appears with it. > > > > > > Enjoy and Happy Holidays! > > > > > > Sam > > > > > > > > > > > > > > > > > > Attachment(s) from Sam Lucero > > > > > > 1 of 1 File(s) > > > > > > <> > > > > > > > > > < > > > es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes > > > with a Tek Model 576 Semiconductor Curve Tracer.pdf > > > > > > The links don't work. Am I missing something? Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?

YES!
??
Unfortunately, the pictures aren't there, and I can't seem to be able to find Part Two on how to modify the 576 for the job.
??
Thank's a lot,
??
Jim

--- On Sun, 5/20/12, glydeck@... <glydeck@...> wrote:


From: glydeck@... <glydeck@...>
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Sunday, May 20, 2012, 4:29 PM



??




Jim,


Let me know if this works....




glydeck@...



-----Original Message-----
From: Jim Elliott <jimafm@...>
To: TekScopes <TekScopes@...>
Sent: Sat, May 19, 2012 3:54 pm
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...


??








I'm still unable to open.?? My PC keeps telling me it is an unknown file type.
??
Can you direct me to a program that will open the link?
??
Thanks again,
??
Jim

--- On Sat, 5/19/12, glydeck@... <glydeck@...> wrote:


From: glydeck@... <glydeck@...>
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Saturday, May 19, 2012, 6:31 PM



??

The link was broken with a carriage return. ??Try this;






glydeck@...



-----Original Message-----
From: jimafm <jimafm@...>
To: TekScopes <TekScopes@...>
Sent: Sat, May 19, 2012 12:40 pm
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...


??





--- In TekScopes@..., "c1ferrari" <onerossocorsa328@> wrote:

Happy New Year, all,

Just wanted to report this article is unavailable on the web.
When I re-discover, LOL, the info pertaining to power supplies -- I'll post.

Best regards,
Sam

--- In TekScopes@..., "c1ferrari" <onerossocorsa328@> wrote:

Hey Craig,

Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some suggestions for the necessary power supplies.

Next for your stable...Tek 570 or 370, Craig? ;-)

Season's Greetings,

Sam

--- In TekScopes@..., "Craig Sawyers" <c.sawyers@> wrote:

Interesting article, Sam.



I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular
575 too).



The key benefit of the 577 as compared with the much older 575 is that it
was designed after the FET became common - hence the step amplifier on the
577 goes up to 2V per step as compared with 0.2V per step for the 575. It
also (as the article points out) has a much wider range of voltage and
higher current capability than the 575 - or the 570 for that matter.



However, to be fully featured, it still needs a step amplifier to get to the
10V/step needed for some of the more esoteric (audio) valves like the 300B,
and the characteristic curves for things like the KT88 call for 5V steps.
And a screen grid supply is also needed whatever tracer is used. And
although the formal definition gm is a limit (dIa/dVg at constant Va), and
that most tube testers measure with a 1V grid voltage step, you can get a
surprisingly accurate result by measuring between grid voltage steps and
doing the calculation on that basis. Or use the measurement method in the
paper Sam attached, which should be as accurate as the calibration of the
tracer.



But (given screen grid and heater supplies) it is easier to do most small
signal and some power tubes with a 577 as compared with a 575mod122C for
sure.



Craig



PS it would be good to get a link to the article including the diagrams







From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of Sam Lucero
Sent: 23 December 2011 02:33
To: TekScopes@...
Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576
Semiconductor Curve Tracer... [1 Attachment]



[Attachment(s) from Sam Lucero included below]




manuscript courtesy of its author, Daniel Schoo, is available, here, in pdf
format. Please note photos have been omitted due to bandwidth requirement.

Daniel furnishes the article on the condition it be distributed and
reproduced with it's original content unchanged with no editing.
An accompanying article on the Tek 577 appears with it.

Enjoy and Happy Holidays!

Sam





Attachment(s) from Sam Lucero

1 of 1 File(s)

<>


<
es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes
with a Tek Model 576 Semiconductor Curve Tracer.pdf

The links don't work. Am I missing something?

Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?

?

On 12/3/2012 7:05 PM, jerryszesf wrote:
> Same question again... Does anyone still have the pictures or part two
> of Mr. Schoo's tutorial?
>
> Thanks,
> Jaz
>
Hello, Jaz--

While I can't help with the missing artwork from Mr. Schoo's
tutorial, I did something similar with a Tektronix 575
curve tracer. I designed and assembled an adaptor board
that uses screw-terminal strips for configuring a socket
for the tube under test. An external power supply ("wall
wart") delivers heater power, and a second supply provides
screen voltage if needed.

Using screw-terminal strips allows for easy substitution of
a variety of tube sockets of up to 12 pins. Two additional
strips provide interconnections between the host PC board and
the socket. You can prewire sets of interconnections for
frequently-tested tubes types.

You can view photos of the adaptor and a set of curves
obtained from a 6SN7-GT here:



While a 575 won't deliver more than 200 volts to a tube's
plate, that's adequate for experimentation and exploration of
the concept. This approach provides considerable test flexibility
at low cost and will hopefully inspire anyone new to vacuum tube
technology to investigate how tubes work.

73--

Brad AA1IP

P.S.: A 1-kilohm resistor connected the tracer's base and emitter
terminals converts current steps into voltage steps. Before firing up a
tube, make sure that the curve tracer's base-step controls are set to
produce negative-going steps. Note that most tube specifications list
the "maximum positive control-grid voltage" parameter as ZERO volts.
Running the control grid positive will produce a brief fireworks
display before the fragile grid overheats and melts.

Jaz,

Here is the pentode tester I made for the 575





Here is the fixture I built for triodes



A complete PDF for both is posted on tek scope 2, and the circuit works with the 577 and the 576.

George


On Dec 3, 2012, at 5:39 PM, Brad Thompson <brad.thompson@...> wrote:

On 12/3/2012 7:05 PM, jerryszesf wrote:

Same question again... Does anyone still have the pictures or part two
of Mr. Schoo's tutorial?

Thanks,
Jaz

Hello, Jaz--

While I can't help with the missing artwork from Mr. Schoo's
tutorial, I did something similar with a Tektronix 575
curve tracer. I designed and assembled an adaptor board
that uses screw-terminal strips for configuring a socket
for the tube under test. An external power supply ("wall
wart") delivers heater power, and a second supply provides
screen voltage if needed.

Using screw-terminal strips allows for easy substitution of
a variety of tube sockets of up to 12 pins. Two additional
strips provide interconnections between the host PC board and
the socket. You can prewire sets of interconnections for
frequently-tested tubes types.

You can view photos of the adaptor and a set of curves
obtained from a 6SN7-GT here:



While a 575 won't deliver more than 200 volts to a tube's
plate, that's adequate for experimentation and exploration of
the concept. This approach provides considerable test flexibility
at low cost and will hopefully inspire anyone new to vacuum tube
technology to investigate how tubes work.

73--

Brad AA1IP

P.S.: A 1-kilohm resistor connected the tracer's base and emitter
terminals converts current steps into voltage steps. Before firing up a
tube, make sure that the curve tracer's base-step controls are set to
produce negative-going steps. Note that most tube specifications list
the "maximum positive control-grid voltage" parameter as ZERO volts.
Running the control grid positive will produce a brief fireworks
display before the fragile grid overheats and melts.

?

I *think* he means Yahoo group Tekscopes2

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
Sent: 14 December 2012 05:13
To: TekScopes@...
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

Gents,

Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...

TIA,
Jaz

?

I *think* he means Yahoo group Tekscopes2

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
Sent: 14 December 2012 05:13
To: TekScopes@...
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

Gents,

Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...

TIA,
Jaz

?

Go to

Dave

On 12/14/2012 4:18 AM, David C. Partridge wrote:

?

I *think* he means Yahoo group Tekscopes2

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
Sent: 14 December 2012 05:13
To: TekScopes@...
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

Gents,

Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...

TIA,
Jaz

Here are the links







George

On Dec 14, 2012, at 5:56 AM, Dave Daniel <kc0wjn@...> wrote:

Go to

Dave

On 12/14/2012 4:18 AM, David C. Partridge wrote:

I *think* he means Yahoo group Tekscopes2

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
Sent: 14 December 2012 05:13
To: TekScopes@...
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

Gents,

Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...

TIA,
Jaz

Dave, You are correct! Sorry for not being more specific. --George

On Dec 14, 2012, at 3:18 AM, "David C. Partridge" <david.partridge@...> wrote:

I *think* he means Yahoo group Tekscopes2

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
Sent: 14 December 2012 05:13
To: TekScopes@...
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...

Gents,

Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...

TIA,
Jaz

?

George,

I am getting ready to build the tube adapter, just a question on the screen supply - does the negative leg need to be tied to the "E" or the cathode? In your schematic, it just shows the connection to the meter display.

Thanks,
Jaz

--- In TekScopes@..., Glydeck wrote:
>
>
>
> Dave, You are correct! Sorry for not being more specific. --George
>
> On Dec 14, 2012, at 3:18 AM, "David C. Partridge" wrote:
>
> > I *think* he means Yahoo group Tekscopes2
> >
> > Dave
> > -----Original Message-----
> > From: TekScopes@... [mailto:TekScopes@...] On Behalf Of jerryszesf
> > Sent: 14 December 2012 05:13
> > To: TekScopes@...
> > Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
> >
> > Gents,
> >
> > Thanks for the links! George, excuse my ignorance, but what is tek scope 2? Tekscope Vol. 2? If so, do you have a link to it? Google did not turn up much...
> >
> > TIA,
> > Jaz
> >
> >
>