开云体育

Hi Barry,

With the same setup you can add a second input (plugin or channel) in the monitoring scope and display there the amplified signals present further on at the vertical amplifier board. Triggering as before (R4470) should remain unaffected when you change 7704A vertical position up/down. I would start with the deflection plates. With DC coupled input the observed actual character wave forms fragments will remain at the same vertical position while the normal trace moves up/down when you change the vertical position in the 7704A. Again you may see or not see an effect of that on the character waveform fragments.

Albert

I should have asked for one of those [Hexacon soldering iron] when I was laid off, in addition to the Weller and the Antex. I worked at Tek after the strip era but I remember seeing a few in dusty back rooms. Nowadays I do a lot of work on ceramic-era instruments.

Dave Wise
Information Display, 1980-1994
________________________________
From: [email protected] <[email protected]> on behalf of Art S <artsamps@...>
Sent: Saturday, March 2, 2024 7:03 AM
To: [email protected] <[email protected]>
Subject: Re: [TekScopes] about those vintage ceramic terminal strips...

When we closed up our assembly department, my old boss gifted me an entire box of the Hexacon stick irons shown in the video. All brand new in boxes, spare elements, the whole deal. They may not be temperature controlled, but I still believe them to be one of the finest, most reliable irons ever made.

Cheers, Art

I have monitored the signal at that point and cannot see any difference there when positioning the trace at the top or bottom. Yes, fully CW or CCW is most likely overdriving the vertical amplifier and the stretching is at its worst at those settings; however, the stretching is quite noticeable even when a trace is positioned at the top or bottom of the screen. The stretching is worse on the characters at the top when the trace is at the bottom and vice-versa. I can see a very small bit of this effect on the characters in my other 7704A but it is much worse in this one.

Thanks,
Barry - N4BUQ

Hi Barry,

It should be not too difficult to check whether or not the incoming signal at
R4470 is affected by vertical position changes.
I tried this (and saw no effect, of course) viewing and triggering that incoming
signal, also with delayed sweep. It's best to have all readouts in the same
row since then you can enlarge the waveform without overdriving the monitoring
scope. The actual observed character height can be twice that of the height on
the 7704A.
By the way, 7704A positions fully CW and fully CCW might also be at the border
of overdriving the vertical amplifier. I would not go beyond top and bottom of
the CRT.

Albert

Hi Barry,

It should be not too difficult to check whether or not the incoming signal at
R4470 is affected by vertical position changes.
I tried this (and saw no effect, of course) viewing and triggering that incoming
signal, also with delayed sweep. It's best to have all readouts in the same
row since then you can enlarge the waveform without overdriving the monitoring
scope. The actual observed character height can be twice that of the height on
the 7704A.
By the way, 7704A positions fully CW and fully CCW might also be at the border
of overdriving the vertical amplifier. I would not go beyond top and bottom of
the CRT.

Albert

THe book looks great! Can you tell us a little about it (table of contents?)
When will it be shipping. Do you know if they will ship to the U.S?
Can’t wait to read it!
Grayson
KJ7UM
Check out Hollow-State Design
tinyurl.com/hollowstatedesign3 <>
My technical blog:
kj7um.wordpress.com <>

Hi Guys,
thanks to the trust of Elektor, one of the best known electronics editors, with my immense joy, a book of mine became reality...
I mean: a real book, in real paper, not just a pdf file.
I am incredibly happy with the result, which went beyond my expectations. Two kilograms, nearly 600 pages and a very high quality.
If you like, you can buy it from here:
Currently it says "out of stock" but it is coming.
I added two photos of the book in the photo section.
I wish to thank the Editor and the many who helped me in reaching this target.

On Mar 2, 2024, at 08:53, Colin Herbert via groups.io <colingherbert@...> wrote:

?I don't suppose I'll be the only one to offer this information, but Tekwiki states that the TM-515 does _not_ have a high-power bay, but if a PS-505 is put into a standard-power bay, it is limited to 1A output, rather than the possible 4A. Tekwiki doesn't mention a PS-505-1 variant. Did you get this correct, Dave?

Colin.

On 02/03/2024 13:08, Dave Daniel wrote:
A TM-515 is certainly worth having.

I forget whether it has a"high power" slot like the TM-504/6 mainframes, but in any case my first thought was that a PS-505-1 needs to be in a high power slot or else it won't work.

DaveD

On Mar 2, 2024, at 00:50, Jim Ford<james.ford@...> wrote:

?Yes, this TM515 portable TM500 series mainframe has to go. Now, it's not working properly, but you can have it free if you're willing to pick it up at my place in Laguna Hills, California, USA.

I tried using a PS501-1 in it, but the 5 V output read about 0.7 V in the right 3 slots, and was an unstable about 5 V in the left 2 slots. I bought the PS501-1 from Sphere Research, so it should be working.

Pick up only, please.

Jim Ford
Laguna Hills, California, USA

"And we know that God causes all things to work together for the good of those who love God and are called according to his purpose for them." Romans 8:28 (NLT)