Tektronix 567 video waveform monitor - UK Vintage Radio Repair and Restoration Discussion Forum

jimscoper · 28th Sep 2022, 4:59 pm

for my sins I have one of these - the squarish version rather than the flattish 19" rack version.

I have a problem with the Y amplifier and suspect one or more transistors. But they are in sockets and very very awkward to get at. I pulled two and found their hfe was down in the 10 region. But I am not sure I have - or can - get the replacements back in properly. Access is limited by the tube/shield and output bottles.

Any ideas on how to get the entire tube+shield assembly out? Or I will have to go for another fancy surgical forceps.

rgrds all

6AL5W-Martin · 24th Oct 2022, 5:44 pm

hello Jim,

567 is the most cute Tek ever, a Sampling system with nixie readout, build for UHF input.
I think you mean another Tek scope, not the 567

Martin

factory · 24th Oct 2022, 6:46 pm

Must be one of the waveform monitors listed here: https://w140.com/tekwiki/wiki/Catego...eform_monitors

Maybe the 529?, that one is a hybrid of solid & hollow state components.

David

6AL5W-Martin · 24th Oct 2022, 7:10 pm

wellenkno at the makerfaire hannover 2017,
Tek 567 , own and restorated by Matt

jimscoper · 31st Oct 2022, 10:47 am

My apologies everyone. Mine is a 529, sadly not a 567....

Problem largely solved. But a curious thing is that the Y amplifier is valve/transistor hybrid but not entirely as per schematic. The X timebase is entirely transistor which is definitely not to the schematic. Except for the EHT output valve which is ECL85 or US equivalent which is to diagram but the EHT rectifiers are semiconductors rather than valve as per diagram. Still, parts are marked 1967 so a time of change possibly.

The Y amplifier has a mixture of USA and UK transistors - BC108 and AF118. The tube is in a big shield and is sandwiched between the Y chassis and the X chassis making access 'a bit tight!'.

28th Sep 2022, 4:59 pm	#1
jimscoper Triode Join Date: Jun 2020 Location: Yalding, Maidstone, Kent, UK. Posts: 35	Tektronix 567 video waveform monitor for my sins I have one of these - the squarish version rather than the flattish 19" rack version. I have a problem with the Y amplifier and suspect one or more transistors. But they are in sockets and very very awkward to get at. I pulled two and found their hfe was down in the 10 region. But I am not sure I have - or can - get the replacements back in properly. Access is limited by the tube/shield and output bottles. Any ideas on how to get the entire tube+shield assembly out? Or I will have to go for another fancy surgical forceps. rgrds all

24th Oct 2022, 5:44 pm	#2
6AL5W-Martin Hexode Join Date: Nov 2006 Location: Biedenkopf, [Hessen], Germany. Posts: 425	Re: Tektronix 567 video waveform monitor hello Jim, 567 is the most cute Tek ever, a Sampling system with nixie readout, build for UHF input. I think you mean another Tek scope, not the 567 Martin __________________ www.wellenkino.de Vintage Scope restorations

24th Oct 2022, 6:46 pm	#3
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,732	Re: Tektronix 567 video waveform monitor Must be one of the waveform monitors listed here: https://w140.com/tekwiki/wiki/Catego...eform_monitors Maybe the 529?, that one is a hybrid of solid & hollow state components. David Last edited by factory; 24th Oct 2022 at 6:52 pm.

24th Oct 2022, 7:10 pm	#4
6AL5W-Martin Hexode Join Date: Nov 2006 Location: Biedenkopf, [Hessen], Germany. Posts: 425	Re: Tektronix 567 video waveform monitor wellenkno at the makerfaire hannover 2017, Tek 567 , own and restorated by Matt Attached Thumbnails __________________ www.wellenkino.de Vintage Scope restorations

31st Oct 2022, 10:47 am	#5
jimscoper Triode Join Date: Jun 2020 Location: Yalding, Maidstone, Kent, UK. Posts: 35	Re: Tektronix 567 video waveform monitor My apologies everyone. Mine is a 529, sadly not a 567.... Problem largely solved. But a curious thing is that the Y amplifier is valve/transistor hybrid but not entirely as per schematic. The X timebase is entirely transistor which is definitely not to the schematic. Except for the EHT output valve which is ECL85 or US equivalent which is to diagram but the EHT rectifiers are semiconductors rather than valve as per diagram. Still, parts are marked 1967 so a time of change possibly. The Y amplifier has a mixture of USA and UK transistors - BC108 and AF118. The tube is in a big shield and is sandwiched between the Y chassis and the X chassis making access 'a bit tight!'.