Hameg 1004-3 scope arcing. - UK Vintage Radio Repair and Restoration Discussion Forum

mastercare · 2nd Mar 2017, 9:52 am

Hi all while trying to repair my Sig gen my scope starting arcing. Just a few pops, but I've isolated it to what you call it tripler. LOPTX connects from main board and other end high voltage to CRT.

Does anyone know where I can get any parts mainly this high voltage block. Also it must be used on other Hameg models?

Cheers in advance, Paul.

newlite4 · 2nd Mar 2017, 11:03 am

Paul, I have here a Hameg HM 288-1005-03 tripler taken from a working HM203 scope. Is this the same part number as yours?
Neil

mastercare · 2nd Mar 2017, 10:01 pm

Hi Neil
you could be my savior
the part number on mine is kaskade_99/2 bv060700 does not mean anything to me, but you may know it...its grey in colour yours is blue, i dont know if these scopes have a different eht requirement... theirs 2 wires heavy tension cables one is long goes and plugs into side of crt like the old tvs the other side has a short lead that solders into nearby board, it also has a short leg which solders to chassis...thats all i can tell you at mo. ive had to sw my scope off as i dont wont to damage anything else..
cheers for coming back to me...
paul..

karesz* · 2nd Mar 2017, 11:34 pm

Hallo Neil,
I think your cascade is from HM1005-3, 3-channel version, that has a 12KV D14-372 CRT.
Paul`s HM1004-3 has a 14KV D14-375GH CRT, hmm-maybe the cascades can be same?, but I dont find circuit from both...
I fand a manual for 1005 yet, its cascade is in schematics=DG-1899-661-218 or so-badly readable, hes input is same as from 2KV focus.
Karl

mastercare · 5th Mar 2017, 5:09 pm

Ive still had no luck finding the tripler unit for my hameg scope, im hoping that neil can shed more light on this soon..
regards
paul

WME_bill · 5th Mar 2017, 8:33 pm

Hameg 1004 scope pda multiplier unit.
I suspect you may have to make up a new multiplier unit. Cut the case open, clean out the silicone potting carefully with a sharp knife, or use a silicone remover as sold for removing bathroom silicone sealant.
Then find what has failed- your multimeter will identify that. Either a capacitor or a high voltage diode. Diodes as used in TV will do nicely, either new or from a scrap TV. High voltage ceramic capacitors, 500pf or so, 2kv rating. The last time I wanted some I got them from Cricklewood Electronics.
The cathode ray tubes quoted by Karl "karesz", D14-372 and D14-375 are effectively identical, one made by Philips and the other by Heerlen after Philips sold them the business. Operating conditions are either 2.0kv focus (a2) and 10kv PDA or 2.2kv focus and 16kv PDA. I am not sure which is used in those Hameg scopes. The PDA is less critical than the focus voltage. The Hameg part numbers may have changed just for a new batch or minor modification.
Have you seen the useful discussion upon Tek 475 HV multipliers in 2013 by Maninashed, Ed_Dinning and others. I think you will find them helpful. Just remember that even these small capacitors can retain quite a punch. So discharge them before poking about. wme-Bill m0wpn

newlite4 · 6th Mar 2017, 10:29 am

Paul, you have a PM,
Neil

mastercare · 8th Mar 2017, 6:44 pm

Hi and thanks neil for what you have done, looking at it i see it has 3 connections plus the eht lead to crt. i think mine only has 1 connection which has a red thick wire connecting to the main board. so at this point i dont know what to do..i will look further into this, thanks guys to all that have replied so far...perhaps i will have to strip it down?
paul

mastercare · 11th Mar 2017, 10:25 am

Hi all
i think the 2 pins are fixing pins, im awaiting a response from hameg so we not beaten yet..
cheers
paul

2nd Mar 2017, 9:52 am	#1
mastercare Triode Join Date: Feb 2017 Location: Bridgwater, Somerset, UK. Posts: 35	Hameg 1004-3 scope arcing. Hi all while trying to repair my Sig gen my scope starting arcing. Just a few pops, but I've isolated it to what you call it tripler. LOPTX connects from main board and other end high voltage to CRT. Does anyone know where I can get any parts mainly this high voltage block. Also it must be used on other Hameg models? Cheers in advance, Paul.

2nd Mar 2017, 11:03 am	#2
newlite4 Octode Join Date: Nov 2003 Location: Bath, Somerset, UK. Posts: 1,805	Re: Hameg 1004-3 scope arcing. Paul, I have here a Hameg HM 288-1005-03 tripler taken from a working HM203 scope. Is this the same part number as yours? Neil Attached Thumbnails __________________ preserving the recent past, for the distant future.

2nd Mar 2017, 10:01 pm	#3
mastercare Triode Join Date: Feb 2017 Location: Bridgwater, Somerset, UK. Posts: 35	Re: Hameg 1004-3 scope arcing. Hi Neil you could be my savior the part number on mine is kaskade_99/2 bv060700 does not mean anything to me, but you may know it...its grey in colour yours is blue, i dont know if these scopes have a different eht requirement... theirs 2 wires heavy tension cables one is long goes and plugs into side of crt like the old tvs the other side has a short lead that solders into nearby board, it also has a short leg which solders to chassis...thats all i can tell you at mo. ive had to sw my scope off as i dont wont to damage anything else.. cheers for coming back to me... paul..

2nd Mar 2017, 11:34 pm	#4
karesz* Heptode Join Date: Jun 2010 Location: Zurich, Switzerland Posts: 538	Re: Hameg 1004-3 scope arcing. Hallo Neil, I think your cascade is from HM1005-3, 3-channel version, that has a 12KV D14-372 CRT. Paul`s HM1004-3 has a 14KV D14-375GH CRT, hmm-maybe the cascades can be same?, but I dont find circuit from both... I fand a manual for 1005 yet, its cascade is in schematics=DG-1899-661-218 or so-badly readable, hes input is same as from 2KV focus. Karl Attached Thumbnails Last edited by karesz; 2nd Mar 2017 at 11:53 pm.*

5th Mar 2017, 5:09 pm	#5
mastercare Triode Join Date: Feb 2017 Location: Bridgwater, Somerset, UK. Posts: 35	Re: Hameg 1004-3 scope arcing. Ive still had no luck finding the tripler unit for my hameg scope, im hoping that neil can shed more light on this soon.. regards paul

5th Mar 2017, 8:33 pm	#6
WME_bill Octode Join Date: Oct 2007 Location: Exeter, Devon, UK. Posts: 1,554	Re: Hameg 1004-3 scope arcing. Hameg 1004 scope pda multiplier unit. I suspect you may have to make up a new multiplier unit. Cut the case open, clean out the silicone potting carefully with a sharp knife, or use a silicone remover as sold for removing bathroom silicone sealant. Then find what has failed- your multimeter will identify that. Either a capacitor or a high voltage diode. Diodes as used in TV will do nicely, either new or from a scrap TV. High voltage ceramic capacitors, 500pf or so, 2kv rating. The last time I wanted some I got them from Cricklewood Electronics. The cathode ray tubes quoted by Karl "karesz", D14-372 and D14-375 are effectively identical, one made by Philips and the other by Heerlen after Philips sold them the business. Operating conditions are either 2.0kv focus (a2) and 10kv PDA or 2.2kv focus and 16kv PDA. I am not sure which is used in those Hameg scopes. The PDA is less critical than the focus voltage. The Hameg part numbers may have changed just for a new batch or minor modification. Have you seen the useful discussion upon Tek 475 HV multipliers in 2013 by Maninashed, Ed_Dinning and others. I think you will find them helpful. Just remember that even these small capacitors can retain quite a punch. So discharge them before poking about. wme-Bill m0wpn

6th Mar 2017, 10:29 am	#7
newlite4 Octode Join Date: Nov 2003 Location: Bath, Somerset, UK. Posts: 1,805	Re: Hameg 1004-3 scope arcing. Paul, you have a PM, Neil __________________ preserving the recent past, for the distant future.

8th Mar 2017, 6:44 pm	#8
mastercare Triode Join Date: Feb 2017 Location: Bridgwater, Somerset, UK. Posts: 35	Re: Hameg 1004-3 scope arcing. Hi and thanks neil for what you have done, looking at it i see it has 3 connections plus the eht lead to crt. i think mine only has 1 connection which has a red thick wire connecting to the main board. so at this point i dont know what to do..i will look further into this, thanks guys to all that have replied so far...perhaps i will have to strip it down? paul

11th Mar 2017, 10:25 am	#9
mastercare Triode Join Date: Feb 2017 Location: Bridgwater, Somerset, UK. Posts: 35	Re: Hameg 1004-3 scope arcing. Hi all i think the 2 pins are fixing pins, im awaiting a response from hameg so we not beaten yet.. cheers paul