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Re: Curve Tracer CRTs
Possible Optical Encoder (OE) :
I am a fan of the simple HP small, light, compact OE's that might be retrofitted into the Tek 576 CT for such a enhancement project: It is so light and mass-less that I think a simple plastic tubing or rod extension, perhaps epoxied to the end of the existing shaft could be fitted & drive the HP HEDS 5640 encoder for this purpose ? See: HP HEDS 5640 #A13: rick |
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Re: Curve Tracer CRTs
Good compilation of failure modes... I've had 2 out of 3. So far CRT is ok, fingers crossed.
I may add: - step generator trouble (missing steps and such, often due to aging ICs) - had some bad small signal transistors / FETs recently, in power supply & step generator amp. All this is relatively easy to service, all parts held in sockets. cheers Martin |
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Re: Curve Tracer CRTs
Jon,
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The 576 has 3 main failure modes. Power supply issues - Easily repaired Usually Caps some times a pass element Exhausted tube - Usual indication is very dim display or double ramp or peaking when the intensity was turned up. HV power supply issues - The brown epoxy transformer is known to draw high current when the unit is on for a while and the transformer warms up. This will cause the -75V rail to collapse and the power supply to oscillate on-> off-> on-> off Other than that, it is really just the age maintenance that needs to be done cleaning switches and contacts to maintain good connection. Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Jean-Paul Sent: Wednesday, November 3, 2021 8:46 AM To: [email protected] Subject: Re: [TekScopes] Curve Tracer CRTs Walter, I had 577 years ago and since 1980s 576 with high current pulser 172? fixture. As a power electronics designer the 576 was an essential tool. Accumulated a Collection of plug adapters and manuals, also an SCR turnoff test set. The size and point resolution of the CRT is super. One knob was crumbling, but the only fix I had to do. I feel that these classic instruments should be repaired and restored to original condition. Any digital interface will hack parts and I doubt that the result will be as good. Perhaps old CRTs can be restored somehow? Walter what is the CRT failure mode? Bon Soir¨¦e Jon |
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Re: Looking for fasteners in EU
About forty-five years ago, we had a periodic job where we would rework a worn, tapered surface on a small-diameter part by holding it in a quick-release collet like that (either a South Bend or a Clausing - don't remember which). Hundreds and hundreds of those would make for a pretty mind-numbing day in the toolroom. Good memories, though.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "Leo Potjewijd" <pe1rhx@...> He has a special collet clamping setup, the collet is released by a handle on |
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Re: Looking for fasteners in EU
I am not sure which particular video from Joe Pie.... one is referring to, but most of those that I have watched he is using a collet instead of a chuck which would let you pull the part out to add another feature to the part. A collet is very repeatable unlike a chuck.
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On 11/3/2021 2:13 AM, cheater cheater wrote:
Curious - how does he pull the stock out of the chuck while the lathe |
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Re: Replacement 7000 Plugin Guides
Hi Steve,
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You mentioned that you have some plugins that were heavily damaged. Would you happen to have any other parts available? I have a 7B53A that I think I can resurrect but, among some other things that I can probably source (e.g. some knobs, etc.), it needs the X1/X10 button and the associated shaft and extender that mechanically connects it to the switch towards the rear of the plugin. I'm not sure if any of the ones you have are 7B53As and I'd guess that if the plugins are as damaged as you described, that part might not have survived but thought I'd ask. Thanks again, Barry - N4BUQ ----- Original Message -----
From: "Barry" <n4buq@...> Hi Steve, |
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Re: Curve Tracer CRTs
Walter, I had 577 years ago and since 1980s 576 with high current pulser 172? fixture.
As a power electronics designer the 576 was an essential tool. Accumulated a Collection of plug adapters and manuals, also an SCR turnoff test set. The size and point resolution of the CRT is super. One knob was crumbling, but the only fix I had to do. I feel that these classic instruments should be repaired and restored to original condition. Any digital interface will hack parts and I doubt that the result will be as good. Perhaps old CRTs can be restored somehow? Walter what is the CRT failure mode? Bon Soir¨¦e Jon |
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Re: tek 2215 trace position issues
If you look through the service manual you find lots of power lines labelled with a suffix, for example at Q736 where the X signal emerges from the sweep board you see +8.6V7 and -8.6V7. There are a lot of these and they are decoupled versions of the +/- 8.6V lines using typically a 10R resistor and a decoupling capacitor. They exist on the other supply voltages as well.
When you accidentally shorted out the main board it is likely that some of these 10R resistors have gone open circuit so even though you have the correct voltage at the PSU you don't have any volts where it matters. Over on the Vintage Wireless Forum you said (I think) that the spot doesn't respond to Ch1 and Ch2 position controls when in XY mode. Without any working circuitry to eliminate I am afraid I can't think of anything apart from a systematic search for missing decoupled supply rails. With good lighting you may be able to spot burned parts visually. Roger |
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Re: Looking for fasteners in EU
If you like Joe's channel you'll probably like Stefan Gotteswinter's channel as well.
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Bruce On 03 November 2021 at 23:45 cheater cheater <cheater00social@...> wrote: |
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Re: Looking for fasteners in EU
On Wed, Nov 3, 2021 at 9:42 AM Leo Potjewijd <pe1rhx@...> wrote:
Lovely channel. I subscribed. Looking forward to countless long hours watching him work there. The idea of using a piece of phenolic to back the work piece so it doesn't deflect and make the cut conical is just great. |
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Re: Looking for fasteners in EU
Makes sense! It really looked like he was doing it... probably just a
joke of sorts. On Wed, Nov 3, 2021 at 10:48 AM Bruce Griffiths <bruce.griffiths@...> wrote:
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Re: Looking for fasteners in EU
he doesn't, it only appear so because the video is edited to shorten it.
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Bruce On 03 November 2021 at 22:13 cheater cheater <cheater00social@...> wrote: |
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Re: Looking for fasteners in EU
Curious - how does he pull the stock out of the chuck while the lathe
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is running? He does that around the two and a half minute mark. On Wed, Nov 3, 2021 at 9:42 AM Leo Potjewijd <pe1rhx@...> wrote:
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Re: Looking for fasteners in EU
The chances of finding anyone having that sort of screw in their portofolio are (very) slim to none, and even if they do you'll probably have to by several hundreds of them...
Solutions that may work for you are allthread with a soldered-on nut and cut a slot in it, or make your own. Joe Pieczynski has done a video on how to single-point (!) such small threads on a lathe.: |
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Re: Looking for fasteners in EU
On Wed, Nov 3, 2021 at 5:45 AM stevenhorii <sonodocsch@...> wrote:
I have a small-scale CNC lathe here, but I was hoping to avoid using it for a screw of this size. |
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Re: Looking for fasteners in EU
On Wed, Nov 3, 2021 at 1:21 AM snapdiode via groups.io
<snapdiode@...> wrote: Buddy, I don't know what your problem is. Obviously you get very upset by questions about screws. Take a hike. WTF. |
Martin
Jean-Paul
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