Re: 7A19 Fuse (later model, on attenuator - thin film?)
try MEK sometimes it works when Acetone does not.
¸é±ð²Ô¨¦±ð
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On 2/15/22 7:06 PM, Cliff Carrie wrote: Harvey has found a Schurter fuse (3413.0009.11) at Mouser that looks like a very good match: 0.2A, 0.385 ohms, rated to interrupt 63VDC or 125VAC, and a very small footprint of 3.2 x 1.6 x 1.6 mm. Price is just over $1.00 each (+S&H) depending on quantity. I don't know how I missed that one. Good find, Harvey. Now I really need to open my blown original fuse to see if the lower substrate survives. Acetone still shows no signs of working. I may have to sacrifice one blown fuse just to find out what adhesive they used and how to soften it and remove the cap without breaking the base.
Harvey, I don't see your post on the list. It's possible the image you embedded caused it to be refused.
Cliff
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Re: 7A19 Fuse (later model, on attenuator - thin film?)
Cliff, you may find the ceramic fuse unit to be impervious to normal solvents, if the pieces are glass-frit sealed. This is a relatively low temperature glass fusing/adhesive material often used to make ceramic-packaged ICs and such (even CRTs). If you can see any of the "goop" involved in the seal, try gouging it with a knife and see how hard it is. If it still appears to be "hard as rock," then your only hope is to heat it to a much higher temperature than used for soldering, or to fracture the joint, such as by properly banging a sharp, hard, knife edge into the joint, with the part backed up on a block of wood, There's a good chance that the whole thing will shatter, but you don't have much to loose anyway, working on a burned out fuse unit.
If you're familiar with ceramic DIP ICs, you can picture how the frit is fused to bond the base, lead frame, and lid, all without damaging the IC die within. The same could be used for a fusible element inside, as long as the temperature range and process speed are right. I happen to have an old "IC opener" jig that I got somewhere many years ago, but never needed to use. It's a very stout cast iron and steel frame with a rail for the IC, and screw-adjustable knife edges to put controlled force on the joint from each end. As the screws are tightened, the lid eventually pops off, exposing the innards of the IC.
Most frits I've seen are the typical grayish stuff used in ICs, while those in CRTs may be gray, white or yellowish, and always opaque - it's not quite like molten glass, but particles of glass suspended in a partly molten vitreous binder - more like a glaze used in ceramics.
Ed
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Boy, someone has a lot of personal issues and extra time on their hands...
-Dave
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On Tuesday, February 15, 2022, 02:42:58 PM PST, cheater cheater <cheater00social@...> wrote: On Tue, Feb 15, 2022 at 2:44 PM Lawrance A. Schneider <llaassllaaass@...> wrote:
On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:
A dispute with group co-owner Michael Dunn, as I understand it.
That's incorrect, Jim. There was a dispute and it was about Chuck acting very badly on the list which is the actual reason he got kicked off. Other words would better describe his behavior that I won't want to post here. In a private message, Chuck told me roughly the same thing.? I do not have permission to post that message and thus, will not.? I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him. You're using his list, every message you send comes through something he set up and has been taking care of, that's your personal relation, you could show a little bit of thankfulness for that. My wish is that the two groups combine.? Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B.? As I understand it, the purpose of this group is to EXCHANGE IDEAS.? So long as 'banter' is polite, I welcome and appreciate it. And that's the sticking point. Chuck has been impolite to countless members. He hasn't been like that to you, so you regularly come back demanding he gets unbanned. It's not happening. People like you say "oh I thought this was about the EXCHANGE OF IDEAS". Yeah, no, you can't have exchange of ideas in vacuum, it's always connected to people acting personable towards each other, and Chuck showed time and again that he can't be trusted to do so. Personally I think people who don't manage to do that are like people who can't wipe their own butt, and should be pitied, but also it's been demonstrated they don't belong here. As I understand it, Chuck has been asked to rejoin the group and declined. He wasn't. Stop repeating made up stories that aggrandize your friend Chuck. I like/enjoy/learn from the banter between various peoples on this group and the '2' group. That's nice - for YOU. Chuck took away this enjoyment from many people. These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago.? The group separation is similar to the censorship of ideas.? It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY. Peer reviewed journals exist like they always have. Chuck helped you repair a few scopes. That's in no way comparable to the sheer amount of work required to progress the world's state of science to an extent where someone wants to actually publish you in a peer reviewed journal that people read. It's a glorified engine oil change, and you're romanticizing. The truth is that the list has been faring perfectly well without Chuck and the likes of him and therefore it's right to say "good riddance" on someone who's been less than nice to people on here. If you cared about the list you'd care about how others are being made to feel, rather than zero-in on what sort of repair advice resources you can acquire, to the exclusion of any other consideration of other members of the list. We're not here to entertain a guy who you want to keep around. You have his email address, go email him on your own dime, we don't want the toxic radiation. Every time Dennis Tillmann is brought up you start spinning yarns demanding Chuck gets unbanned. Dennis has no role in this and probably wouldn't anyways. Stop asking. He shouldn't have been an a**hole to so many people. Can the Chuck thing die off already. It's not happening as long as the list owner is alive, and you all know it, so drop it.
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Re: RTM/TM 506 Fan replacement
Well...... I do have a rather strange solution:
3D print an adaptor that fits over the vents of the equipment. Use a shop vac airhose of any desired size.? Run all of them through Y adaptors and into a reasonable style of shop vac. Intstall an automatic switch on the requisite equipment so that when one is turned on, the shop vac is turned on.
Locate shop vac in room nearest annoying neighbor, vent outside.
Harvey
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On 2/15/2022 10:31 PM, radeng wrote: Has anybody found a modern quiet fan that moves enough air in this application?
My shop does a lot of audio work, when I turn on 2 or 3 of the mainframes the fan noise is such that subtle audio details are lost in the ambient wash of noise from the test gear rack.
I've had limited success with the DC Noctua fans. Reasonably quiet, but air flow not as strong.
Any suggestions? I really like my 7603's but have the same issue when working on audio gear.
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RTM/TM 506 Fan replacement
Has anybody found a modern quiet fan that moves enough air in this application?
My shop does a lot of audio work, when I turn on 2 or 3 of the mainframes the fan noise is such that subtle audio details are lost in the ambient wash of noise from the test gear rack.
I've had limited success with the DC Noctua fans. Reasonably quiet, but air flow not as strong.
Any suggestions? I really like my 7603's but have the same issue when working on audio gear.
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311-1430-00 pot wanted for 465 Horiz. position
I would like to get a replacement for mine. The fine control in mine is open. I have a pair of 24,000 ohm resistors from each end to the center to simulate it centered. The shaft was that way when I got it and is pushed in. The coarse works.
Mark
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Tom,
For the 465, the parts are different. I will give you what I changed in mine as I look at it to verify the parts. The resistors I put in are 1% types. Notes after the part number is what I used for the R and wattage. My 465 is below 250,000 S/N.
R331- I used a 100 and 91 ohms 1/2W in series
R336- (2) 1300 ohms 1/2W in parallel
R341- parallel 1100 ohms 1/2W
R345- 1100 1/2W
R358- 2000 ohms 1/2W
R677, R687- 1000 ohm 1W
R836, R834- 22 1/2W (Does not have to be this exact value. It is to lower the lamp voltage)
R1045- 5600 1W
R1053- 6200 2W
R1314, R1344- 910 1W
R1315, R1336- 220 1/2W
Q678, Q688- KSP10BU (replaces 0367 transistor)
R1062, R1082- 4300 2W
R1224, R1234- 3000 1W 750 ohms 1/2W in series
R1255- 180 1W
R1275- 220 1W
R1264, R1284- 39,000 1W
R1289- 27,000 1W
C1220- 1000mfd 16V Nichicon UHE
Q1262, Q1282- 2225 dual fin heat sink for TO-5 transistor
R1235- 1000 1W in parallel 20,000 1/2W
R1518- 20,000 2W
R1524- 4700 2W
R1528- 22,000 2W
R1533- 56,000 1/2W
R1472- 390 1/2W
R1478- 39,000 1W
R1698 (fan board)- parallel a 10,000-15,000 ohm to speed up fan. The low resistance will make the fan speed increase (10,000 ohms highest speed, 15,000 ohms slowest speed in the range I mentioned). I did unsolder the fan to oil the rear bearing. There is a small set screw holding it that uses a flat blade screwdriver. This screw is under the "glue".
I added 22 ohm 1/2W resistors, value not critical, to the Volts/Div. indicator lamps.
NTC on primary of power transformer 527-CL70 (Mouser number).
Replace the 1.5A 200V bridges with 4A types.
I did add compound to the heatsinks on the transistors that have the heatsinks, including the ones on the TO-92 types.
Of course the main filter electrolytics are new and the list is the same for the plain and B version.
The same 9V zener in the power supply was replaced with the BZX85B9V1 as in the B version.
Use whatever upgrades listed above.
Renee and Tom, let us know how you are coming on your restoration since you to mentioned it. I hope you two get them going to your satisfaction. I hope this list helps you two and anyone else that chooses to use it.
Mark
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Re: 7A19 Fuse (later model, on attenuator - thin film?)
Tekscopes doesn't do attachments.
I did send the post, and I have a record that it showed up.
Curious.
Glad you found the fuse to be suitable (I hope).
May still have to see if you can make a standard PC board, if that material would suitable.
Harvey
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On 2/15/2022 10:06 PM, Cliff Carrie wrote: Harvey has found a Schurter fuse (3413.0009.11) at Mouser that looks like a very good match: 0.2A, 0.385 ohms, rated to interrupt 63VDC or 125VAC, and a very small footprint of 3.2 x 1.6 x 1.6 mm. Price is just over $1.00 each (+S&H) depending on quantity. I don't know how I missed that one. Good find, Harvey. Now I really need to open my blown original fuse to see if the lower substrate survives. Acetone still shows no signs of working. I may have to sacrifice one blown fuse just to find out what adhesive they used and how to soften it and remove the cap without breaking the base.
Harvey, I don't see your post on the list. It's possible the image you embedded caused it to be refused.
Cliff
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Re: 7A19 Fuse (later model, on attenuator - thin film?)
Harvey has found a Schurter fuse (3413.0009.11) at Mouser that looks like a very good match: 0.2A, 0.385 ohms, rated to interrupt 63VDC or 125VAC, and a very small footprint of 3.2 x 1.6 x 1.6 mm. Price is just over $1.00 each (+S&H) depending on quantity. I don't know how I missed that one. Good find, Harvey. Now I really need to open my blown original fuse to see if the lower substrate survives. Acetone still shows no signs of working. I may have to sacrifice one blown fuse just to find out what adhesive they used and how to soften it and remove the cap without breaking the base.
Harvey, I don't see your post on the list. It's possible the image you embedded caused it to be refused.
Cliff
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Re: 492 master reference oxco adjustment possible? or useless?
The 492BP that I have has the external ref input, accepts 1,2,5,10MHz references (edge close to internal 1MHz PLL.)
P.s.I don't fully understand the tuning mechanism even after reading both service manuals. Its complex as hell. At some lower span the first LO stops sweeping and the second LO takes over? What about the auxiliary?
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FACT - I invited Chuck to rejoin. He declined to do so.
Discussion ended please.
David
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of cheater cheater Sent: 15 February 2022 22:42 To: TekScopes < [email protected]> Subject: Re: [TekScopes] Dennis Tillman On Tue, Feb 15, 2022 at 2:44 PM Lawrance A. Schneider <llaassllaaass@...> wrote:
On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:
A dispute with group co-owner Michael Dunn, as I understand it.
That's incorrect, Jim. There was a dispute and it was about Chuck acting very badly on the list which is the actual reason he got kicked off. Other words would better describe his behavior that I won't want to post here. In a private message, Chuck told me roughly the same thing. I do not have permission to post that message and thus, will not. I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him. You're using his list, every message you send comes through something he set up and has been taking care of, that's your personal relation, you could show a little bit of thankfulness for that. My wish is that the two groups combine. Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B. As I understand it, the purpose of this group is to EXCHANGE IDEAS. So long as 'banter' is polite, I welcome and appreciate it. And that's the sticking point. Chuck has been impolite to countless members. He hasn't been like that to you, so you regularly come back demanding he gets unbanned. It's not happening. People like you say "oh I thought this was about the EXCHANGE OF IDEAS". Yeah, no, you can't have exchange of ideas in vacuum, it's always connected to people acting personable towards each other, and Chuck showed time and again that he can't be trusted to do so. Personally I think people who don't manage to do that are like people who can't wipe their own butt, and should be pitied, but also it's been demonstrated they don't belong here. As I understand it, Chuck has been asked to rejoin the group and declined. He wasn't. Stop repeating made up stories that aggrandize your friend Chuck. I like/enjoy/learn from the banter between various peoples on this group and the '2' group. That's nice - for YOU. Chuck took away this enjoyment from many people. These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago. The group separation is similar to the censorship of ideas. It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY. Peer reviewed journals exist like they always have. Chuck helped you repair a few scopes. That's in no way comparable to the sheer amount of work required to progress the world's state of science to an extent where someone wants to actually publish you in a peer reviewed journal that people read. It's a glorified engine oil change, and you're romanticizing. The truth is that the list has been faring perfectly well without Chuck and the likes of him and therefore it's right to say "good riddance" on someone who's been less than nice to people on here. If you cared about the list you'd care about how others are being made to feel, rather than zero-in on what sort of repair advice resources you can acquire, to the exclusion of any other consideration of other members of the list. We're not here to entertain a guy who you want to keep around. You have his email address, go email him on your own dime, we don't want the toxic radiation. Every time Dennis Tillmann is brought up you start spinning yarns demanding Chuck gets unbanned. Dennis has no role in this and probably wouldn't anyways. Stop asking. He shouldn't have been an a**hole to so many people. Can the Chuck thing die off already. It's not happening as long as the list owner is alive, and you all know it, so drop it.
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On Tue, Feb 15, 2022 at 2:44 PM Lawrance A. Schneider <llaassllaaass@...> wrote:
On Mon, Feb 14, 2022 at 01:28 PM, Jim Ford wrote:
A dispute with group co-owner Michael Dunn, as I understand it.
That's incorrect, Jim. There was a dispute and it was about Chuck acting very badly on the list which is the actual reason he got kicked off. Other words would better describe his behavior that I won't want to post here. In a private message, Chuck told me roughly the same thing. I do not have permission to post that message and thus, will not. I have not asked Mr. Dunn for his version of the dispute as I have never specifically sought his advice about any problems I've had with my scopes and thus have no personal relation with him. You're using his list, every message you send comes through something he set up and has been taking care of, that's your personal relation, you could show a little bit of thankfulness for that. My wish is that the two groups combine. Chuck has been an inspiration to me and the banter between he and others helped me refurbish a 2445B. As I understand it, the purpose of this group is to EXCHANGE IDEAS. So long as 'banter' is polite, I welcome and appreciate it. And that's the sticking point. Chuck has been impolite to countless members. He hasn't been like that to you, so you regularly come back demanding he gets unbanned. It's not happening. People like you say "oh I thought this was about the EXCHANGE OF IDEAS". Yeah, no, you can't have exchange of ideas in vacuum, it's always connected to people acting personable towards each other, and Chuck showed time and again that he can't be trusted to do so. Personally I think people who don't manage to do that are like people who can't wipe their own butt, and should be pitied, but also it's been demonstrated they don't belong here. As I understand it, Chuck has been asked to rejoin the group and declined. He wasn't. Stop repeating made up stories that aggrandize your friend Chuck. I like/enjoy/learn from the banter between various peoples on this group and the '2' group. That's nice - for YOU. Chuck took away this enjoyment from many people. These groups are the closest 'amateurs' like me have to the peer reviewed journals I used to read so many years ago. The group separation is similar to the censorship of ideas. It is absurd to go from one group and quote something to the other group seeking the banter enjoyed within each SEPARATELY. Peer reviewed journals exist like they always have. Chuck helped you repair a few scopes. That's in no way comparable to the sheer amount of work required to progress the world's state of science to an extent where someone wants to actually publish you in a peer reviewed journal that people read. It's a glorified engine oil change, and you're romanticizing. The truth is that the list has been faring perfectly well without Chuck and the likes of him and therefore it's right to say "good riddance" on someone who's been less than nice to people on here. If you cared about the list you'd care about how others are being made to feel, rather than zero-in on what sort of repair advice resources you can acquire, to the exclusion of any other consideration of other members of the list. We're not here to entertain a guy who you want to keep around. You have his email address, go email him on your own dime, we don't want the toxic radiation. Every time Dennis Tillmann is brought up you start spinning yarns demanding Chuck gets unbanned. Dennis has no role in this and probably wouldn't anyways. Stop asking. He shouldn't have been an a**hole to so many people. Can the Chuck thing die off already. It's not happening as long as the list owner is alive, and you all know it, so drop it.
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Re: Stuff Season opens for 2022 Tuesday at Sphere
Jared,
ti seems we stupidly threw them out, so I deleted them.
thanks for the info though.
-walter
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Thank you Harry.
That was my guess, but I could not find any reference in the manual. Mind you, it is a repro from the wiki site and it may not be complete.
Time to start over.
Jose
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-----Original Message----- From: Harvey White Sent: Monday, February 14, 2022 5:49 PM To: [email protected]Subject: Re: [TekScopes] counter problem That sounds a lot like an error code, which is documented in a very small and obscure portion of the manual. There's a similar type (guessing here for the DC5030A) of error message on the DM5010 DMM. It indicates that the calibration has been lost because the internal NiCd battery is dead and the battery backed up RAM (which holds calibration constants) is dead. First, I'd see if there's a battery on board. Dead battery is the source of many error messages. Secondly, there may be that error code section in the manual (possibly service manual). I'd go from there. Harvey On 2/14/2022 6:23 PM, Joseph Orgnero wrote: A while ago, I found, at a ham swap, a TM500 DC5030A counter., SN B011601, visually good condition, but, on being powered shows what, for me, is an odd fault.
With or no input, digits on te right side show the number 224 with no change regardless the settings of the controls
At the same time, the digits on the left side glow very faintly
The decimal point can be shifted and all the digits glow well when pressing Reset. Besides that there is no response to the controls or
input and the manual offers no clues.
Any ideas as to the cause of ths fault ?
Thanks in advance
Jose Orgnero VE7LBI
-- Jose Orgnero
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Lots of support for Chuck Harris coming back. I don¡¯t.
He took a hard nip at me once after he misread twice, a post I made a few years ago.
Said I should take up a different hobby and save my family grief.
NielsenTelecom
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Jeff,
R4124 is the correct resistor that is 22meg (red red blue gold). The Mouser number is a metal film type. Go ahead and get ten (price break) or more for spares for your other scopes. It might be best to replace the resistor. That way you know it is known accurate and not have the varying intensity at turn-on.
I am glad to help you. You are welcome.
Mark
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Re: 492 master reference oxco adjustment possible? or useless?
On Mon, Feb 14, 2022 at 08:26 PM, John Miles wrote:
It may be a good idea to drill a hole in the cover and adjust the trimmer
through it,
Hi KE5FX: The probable problem with drilling an adjustment access hole, in the case, is locating the hole's center accurately. If the hole ends up off-center, making it bigger is sometimes an option. IME, the hole is usually larger (usually much larger) than what is needed, or appropriate. -- Roy Thistle
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radeng
David C. Partridge
Alexandre Souza
Bill Perkins
