Dave,
You've left out your location.
Radu.
I have a 2465 that I have mostly restored for sale with 4 probes. It's been de-RIFAd, the power supply recapped, the blower replaced by a fan, and the infamous U800 replaced with a RU800v2.
It's reasonably well-calibrated and ready to use.
I'm asking $400 picked up (or could ship then add the actual shipping and insurance of around $100). I will post some pix in a little while.
Dave
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I have a 2465 that I have mostly restored for sale with 4 probes. It's been de-RIFAd, the power supply recapped, the blower replaced by a fan, and the infamous U800 replaced with a RU800v2.
It's reasonably well-calibrated and ready to use.
I'm asking $400 picked up (or could ship then add the actual shipping and insurance of around $100). I will post some pix in a little while.
Dave
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Re: Tek/HP/Etc Discord info
I already have a Discord account so when I tried the link to log in it tole me that my ID was already taken. Now what?
Dave
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Hi all,
some of you know we've been running a Tek/HP/Etc Discord server for a
while now. It's meant as an alternative to the mailing lists, for more
informal chat, voice and video chat, and "water cooler talk". It can
be used for anything that doesn't quite fit any of the mailing lists.
It's gathered a colorful set of regulars and less-than-regulars.
Some recent discussions include:
- tek scope carts
- agilent 2000a/3000a firmware recovery
- electromagnetic vortex cannons
- diy curve tracer project (tube compatible)
- microprobe gov auction
- plutonium welding
- knife sharpening
- 70s analog tape process
- punch card process for configuring a modern device with graphics insert cards
We have various areas such as:
General: intros, pictures, showcase
Tech: Tektronix, HP/Agilent/Keysight, Other T&M, Electronics in
general, Audio/HiFi/Musical Instruments, For Trade & Sale, Retro
Computers, Mechanical Engineering, Gear Lists, References, BSTJ, Old
Journals And Texts, Cutting Edge
The last few (References, BSTJ, Old Journals And Texts, Cutting Edge)
are full of technical reading material spanning several hundred years.
Here's a link to join. The link will work for 7 days after which you
can request a new link off-list. There are no bots and no spam.
All welcome
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Tektronix 577 Fraud Kleinanzeigen Germany
Hi All,
I do not know where else to post this, but there is an individual in Germany on the Kleinanzeigen Portal selling a cheap and in good condition Tektronix 577.
I have bought this, and it was never delivered.
Today I see, that the same device with same description but different seller appeared again.
Be warned, I am pretty sure, this is Fraud.
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Re: Tektronix TDS 460A Digital O Scope power cycling
If R410 is reading open, it's probably a safe bet that it is - a resistor reading a lower value in circuit is inconclusive as there could be parallel paths influencing the reading. ?If it reads HIGHER than it should, the likelihood is that the resistor being measured is out of spec high at the very least. ?I'd start by tacking a 1M ?resistor across the questionable R410 and seeing what happens. -Pat
?
> ------ Original Message ------
> From: buma7@...
> To: [email protected]
> Sent: Monday, August 5th 2024, 04:55 PM
> Subject: [TekScopes2] Tektronix TDS 460A Digital O Scope power cycling
? Symptom:? I have a Textronix TDS 460A Digital O Scope that worked fine at last use.? Unit was unused for about 4 – 6 months.? Upon power up the CRT screen lights up and the “clock” emoji is present on the screen.? The front panel lights flash and you can hear the relays cycling.? The fan runs.? After about 10 seconds the unit goes into a cycling state, cycling on and off every two or three seconds.? Each time it powers the fan runs and the panel lights flash.? You can hear a ticking sound that seems to decrease in volume as time passes. Question:? The troubleshooting procedures decision points ask, “Does the oscilloscope power up.”? Does the fact the unit powers up for 2 seconds repeatedly constitute “power up”.? If it does You move beyond the Backplane board.? If it does not, you are looking at either a LVPS A25, Front Panel A06, Backplane A01, or Aux Power Board A07 failure/replacement. Troubleshooting: 1.????? Checked the voltage of the two 3V batteries. a.????? Battery to A03 CPU Assy. Read 2.04V b.????? Battery to A09 DSP Assy. Read 3.0V c.????? Reversed batteries on reinstallation.? No change in symptoms. 2.????? Verified 115V AC at pins 1 & 3 of J! on LVPS.? (Aux Pwr board to LVPS) 3.????? Performed the LVPS troubling shooting procedure (Fig 6-31 pp 6-78) a.????? Checked voltages (Table 6-11, pp 6-79) b.????? All well below spec. in millivolts.. c.????? Coming down left side all answers are “yes” except last question (Are secondary voltages within Spec (Table 6-11, pp 6-79). d.????? Procedure would indicate that the issue is not with the A25 LVPS. 4.????? Disconnected white wire between Aux. Pwr. Board and LVPS Board. a.????? No change in performance or symptoms. Remade connection. 5.????? Disconnected plug from J2 (22 pin connector on A25 LVPS board). a.????? No change in performance or symptoms.? Remade connection. 6.????? Pulled the LVPS board from scope. a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites. b.????? Checked E caps in circuit with a MESR meter.? Seemed ok. c.????? Read something about R410 (1M).? Read it while in circuit and it appeared to be open.? Planning on removing one side from circuit and read again. 7.????? Performed the Backplane trouble shooting procedure (Fig. 6-46 pp 6-92) a.????? Again, the question goes to what constitutes “power up.” ????????????????????????????????????????????????????????????? i.????? If “yes” could be issue is elsewhere. ???????????????????????????????????????????????????????????? ii.????? If “no” could be problem with A25 LVPS, A06 Front Panel, A01 Backplane, or A07 Aux. Pwr. Board. 8.????? Pulled A03 CPU, A02 Display Assy., and A09 DSP Assy. a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites. b.????? Reinstalled all three. 9.????? Visually inspected A01 Backplane board while Ao3, A02 and A07 out a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites. ? I'd appreciate any advice, insight, and ideas on where to go from here.? For info, you are talking to a mechanical guy.? If it had oil or water leaking out or made a grinding noise I could figure it out.
? Thanks, 73 Harrison N1FAM
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Tektronix TDS 460A Digital O Scope power cycling
Symptom:? I have a Textronix TDS 460A Digital O Scope that worked fine at last use.? Unit was unused for about 4 – 6 months.? Upon power up the CRT screen lights up and the “clock” emoji is present on the screen.? The front panel lights flash and you can hear the relays cycling.? The fan runs.? After about 10 seconds the unit goes into a cycling state, cycling on and off every two or three seconds.? Each time it powers the fan runs and the panel lights flash.? You can hear a ticking sound that seems to decrease in volume as time passes.
Question: ?The troubleshooting procedures decision points ask, “Does the oscilloscope power up.”? Does the fact the unit powers up for 2 seconds repeatedly constitute “power up”.? If it does You move beyond the Backplane board.? If it does not, you are looking at either a LVPS A25, Front Panel A06, Backplane A01, or Aux Power Board A07 failure/replacement.
Troubleshooting:
1.????? Checked the voltage of the two 3V batteries.
a.????? Battery to A03 CPU Assy. Read 2.04V
b.????? Battery to A09 DSP Assy. Read 3.0V
c.????? Reversed batteries on reinstallation.? No change in symptoms.
2.????? Verified 115V AC at pins 1 & 3 of J! on LVPS.? (Aux Pwr board to LVPS)
3.????? Performed the LVPS troubling shooting procedure (Fig 6-31 pp 6-78)
a.????? Checked voltages (Table 6-11, pp 6-79)
b.????? All well below spec. in millivolts..
c.????? Coming down left side all answers are “yes” except last question (Are secondary voltages within Spec (Table 6-11, pp 6-79).
d.????? Procedure would indicate that the issue is not with the A25 LVPS.
4.????? Disconnected white wire between Aux. Pwr. Board and LVPS Board.
a.????? No change in performance or symptoms. Remade connection.
5.????? Disconnected plug from J2 (22 pin connector on A25 LVPS board).
a.????? No change in performance or symptoms.? Remade connection.
6.????? Pulled the LVPS board from scope.
a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites.
b.????? Checked E caps in circuit with a MESR meter.? Seemed ok.
c.????? Read something about R410 (1M).? Read it while in circuit and it appeared to be open.? Planning on removing one side from circuit and read again.
7.????? Performed the Backplane trouble shooting procedure (Fig. 6-46 pp 6-92)
a.????? Again, the question goes to what constitutes “power up.”
????????????????????????????????????????????????????????????? i.????? If “yes” could be issue is elsewhere.
???????????????????????????????????????????????????????????? ii.????? If “no” could be problem with A25 LVPS, A06 Front Panel, A01 Backplane, or A07 Aux. Pwr. Board.
8.????? Pulled A03 CPU, A02 Display Assy., and A09 DSP Assy.
a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites.
b.????? Reinstalled all three.
9.????? Visually inspected A01 Backplane board while Ao3, A02 and A07 out
a.????? No obvious problem.? No corrosion, no swollen E caps, no burn sites.
?
I'd appreciate any advice, insight, and ideas on where to go from here.? For info, you are talking to a mechanical guy.? If it had oil or water leaking out or made a grinding noise I could figure it out.
Thanks, 73 Harrison N1FAM
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Re: Tektronix 585 Restoration
The voltage at all four of the vertical deflection plate terminals should be about 280V. The voltage on both deflection plates should be the same or the beam will be deflected away from the center of the screen. The vertical deflection amp is differential so that you should see nearly the same voltages on either side as you move up or down through the amplifier stages, except that the signal portion will be inverted from one side to the other If you need 7788 tubes, some tv stations might have one stored away somewhere. They were used in some television waveform monitors.
Hugh Gilbert
I’ve checked and triple checked all that. I have 321v and 300v going in on the “terminal resistor” pins and 321v and 300v coming out of the two vertical pins, blue/white 300v and brown/white 321v.?
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Re: Tektronix 585 Restoration
I’ve checked and triple checked all that. I have 321v and 300v going in on the “terminal resistor” pins and 321v and 300v coming out of the two vertical pins, blue/white 300v and brown/white 321v.?
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Re: Tektronix 585 Restoration
I would look for things that you could have done wrongly in installing the new CRT. For instance, deflection wires swapped, RFC's broken, or poor contact to the deflection pins. Unlike the horizontal pins, the vertical pins actually pass current, so the contacts must be good. And, there is a connection on both ends of the vertical deflection plates.... to pass that current. -Chuck Harris On Sat, 03 Aug 2024 14:29:24 -0700 "Eric Boyle via groups.io" <k0elb@...> wrote: Well, remove the blue/white wire from V1274 to the CRT and I get a
half trace sweep. Unhook the brown/white wire from V1284 and I get a
dot. Swapping the tubes from one socket to another makes no
difference.
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Re: Tektronix 585 Restoration
Well, remove the blue/white wire from V1274 to the CRT and I get a half trace sweep. Unhook the brown/white wire from V1284 and I get a dot. Swapping the tubes from one socket to another makes no difference.?
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Re: Tektronix 585 Restoration
That’s what I’m thinking, but I can’t seem to get it back on screen.?
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Re: Tektronix 585 Restoration
Sounds to me at first glance that the beam is deflected off
screen.?
Daun
On 8/3/2024 15:59, Eric Boyle via
groups.io wrote:
I’ve been working on this 585 for a while now and I’m finally
making progress.?
A little backstory; I bought this from a fine gentleman with
the understanding that it wasn’t working and may never work.
When it arrived the CRT was shattered in shipping, which sucked
because it was a P2. Anyways, ordered a “new” CRT off of eBay
and no trace, no nothing. Tinkered with it a little bit, rebuilt
the HV supply and nothing. Put it under the bench for a few
weeks.?
Today I decided to get it out and play with it some more.
Turned it on, and lo and behold, the CRT showed life! Checked
voltages and had the 325 and 500 way off, swapped some tubes
around and got that sorted. Now everything’s back to normal but
still no trace, just a “bloom” on the CRT. I’m at my wit’s end
now because I can’t seem to get a trace. To me, it’s almost like
the trace is off the screen and I’m getting reflections. The
“bloom” will pulse with the time base, so it’s trying to work.?
The best way I can describe the “bloom” is a mushroom cloud.?
Any ideas?
?
?
--
Daun E. Yeagley II, N8ASB
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Tektronix 585 Restoration
I’ve been working on this 585 for a while now and I’m finally making progress.?
A little backstory; I bought this from a fine gentleman with the understanding that it wasn’t working and may never work. When it arrived the CRT was shattered in shipping, which sucked because it was a P2. Anyways, ordered a “new” CRT off of eBay and no trace, no nothing. Tinkered with it a little bit, rebuilt the HV supply and nothing. Put it under the bench for a few weeks.?
Today I decided to get it out and play with it some more. Turned it on, and lo and behold, the CRT showed life! Checked voltages and had the 325 and 500 way off, swapped some tubes around and got that sorted. Now everything’s back to normal but still no trace, just a “bloom” on the CRT. I’m at my wit’s end now because I can’t seem to get a trace. To me, it’s almost like the trace is off the screen and I’m getting reflections. The “bloom” will pulse with the time base, so it’s trying to work.?
The best way I can describe the “bloom” is a mushroom cloud.?
Any ideas?
?
?
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Re: Anyone know what setting these Japanese tools were used in?
I also have a couple of these and have made a couple. Another common place you will see these types of nuts are on old Ford dash nuts, like for the headlight switch.
?
They have a limited use today but when you need one, you need one. Some people use needle nose pliers for example as a substitute but easy to scratch the nut or the case/housing/dash behind it.
--
T. Gerbic
Central California
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Montreal value of 547 collection
I'm contemplating getting rid of my 547 with rewound HV transformer and about 25 plugins, including 1S1s and 1S2s.
I do not wish to ship, so what would the local interest be in Montreal?
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Re: Anyone know what setting these Japanese tools were used in?
On Sun, Jul 14, 2024 at 05:29 PM, John Griessen wrote:
Would you like to give them a home Steve? $6 or $7 postage...
You betcha! I’ll contact you off-list. Thanks.
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Re: Anyone know what setting these Japanese tools were used in?
yes that was the size
7/32 not 3/16
搁别苍é别
On 7/14/24 7:44 PM, Mike Dinolfo via
groups.io wrote:
toggle quoted message
Show quoted text
Maybe
it's for a TRS PL-068 plug connector, which was for vintage
Collins KWM-2 radio microphone; 7/32 inch diameter...
Mike N4MWP
On 7/14/24 21:58, Dale H. Cook wrote:
On 7/14/2024 7:15 PM, Burt K6OQK wrote:
Possibly you have what's referred to as
a "PL310," which is common in
more recent professional audio patch bays.? They are TRS for
Tip,
Ring, Sleeve.? At first the kinda look like 1/4", but they're
smaller.
Professional audio patch bay plugs and jacks come in two sizes -
1/4"
TRS (old school. for balanced lines, based on AT&T
standards) and 1/8"
TRS (new school, for balanced lines, often using two plugs in a
single
plastic barrel for stereo).
|
Re: Anyone know what setting these Japanese tools were used in?
I still have a PL-068 on the end of my ancient T-17 mic cable.
Burt, K6OQK
toggle quoted message
Show quoted text
On July 14, 2024 7:44:48 PM PDT, Mike Dinolfo <mdinolfo@...> wrote:
Maybe it's for a TRS PL-068 plug connector, which was for vintage
Collins KWM-2 radio microphone; 7/32 inch diameter...
Mike N4MWP
On 7/14/24 21:58, Dale H. Cook wrote:
On 7/14/2024 7:15 PM, Burt K6OQK wrote:
Possibly you have what's referred to as a "PL310," which is common in
more recent professional audio patch bays.? They are TRS for Tip,
Ring, Sleeve.? At first the kinda look like 1/4", but they're smaller.
Professional audio patch bay plugs and jacks come in two sizes - 1/4"
TRS (old school. for balanced lines, based on AT&T standards) and 1/8"
TRS (new school, for balanced lines, often using two plugs in a single
plastic barrel for stereo).
|
Re: Anyone know what setting these Japanese tools were used in?
Maybe it's for a TRS PL-068 plug connector, which was for vintage
Collins KWM-2 radio microphone; 7/32 inch diameter...
Mike N4MWP
toggle quoted message
Show quoted text
On 7/14/24 21:58, Dale H. Cook wrote: On 7/14/2024 7:15 PM, Burt K6OQK wrote:
Possibly you have what's referred to as a "PL310," which is common in
more recent professional audio patch bays.? They are TRS for Tip,
Ring, Sleeve.? At first the kinda look like 1/4", but they're smaller. Professional audio patch bay plugs and jacks come in two sizes - 1/4"
TRS (old school. for balanced lines, based on AT&T standards) and 1/8"
TRS (new school, for balanced lines, often using two plugs in a single
plastic barrel for stereo).
|
DaveH52
Cubdriver
Eric Boyle
Steve Byan
Burt K6OQK
Mike Dinolfo