UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Where To Get Sets and Parts

Notices

Where To Get Sets and Parts For discussions about swapmeets, rallies, NVCF and BVWS, car boot sales, antique and charity shops, dealers, newspaper adverts, the local tip and just about any other source of equipment (other than eBay).

Closed Thread
 
Thread Tools
Old 28th Jul 2020, 10:59 am   #1
turretslug
Dekatron
 
turretslug's Avatar
 
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
Default EHT Inverter possibility

Whilst recently researching a spread of possible solutions to what is probably a familiar quandary here (demise of oscilloscope EHT gubbins), I found that a variety of auction site sellers offer what appears to be a version of the classic simple HF power oscillator and step-up transformer. This alleges to provide 15kV of what is presumably un-regulated, near-sinusoidal HF AC from a transformer with six secondary bobbin sections- offering the possibility of modding to one or more EHT rails in multiples of 2.5kV (pre-rectification) per section. The nominal supply is 4V DC with a claim of up to 12V capability with a tweak of base bias resistor- that implies that something like a ubiquitous little 5V SMPS could be used to get an old 'scope/monochrome telly into some sort of action if, say, investigating first light before further expenditure of money and effort, not to mention a bit less hazard than mains EHT.

Without wishing to promote a particular seller, phrasing along the lines "15kV inverter" throws up a spread of options. The price is low enough that it could be considered as the basis of something with added feedback regulation, or simply as a core and sectioned/highly isolated bobbin for customising. Tempted to get one myself as a diagnosis tool.

Hope this is of use to someone! Plus, I'm assuming that folk here are aware of the hazards of this sort of thing without an exhaustive disclaimer.... Colin
turretslug is offline  
Old 28th Jul 2020, 6:13 pm   #2
Lloyd 1985
Nonode
 
Lloyd 1985's Avatar
 
Join Date: Jun 2008
Location: Coningsby, Lincolnshire, UK.
Posts: 2,814
Default Re: EHT Inverter possibility

I might get a couple of these, could be fun! I’ve got a knackered scope tube with O/C heater that I fancy trying to weld the heater in, I’ve tried previously with lower power inverters, but had no success.

Regards
Lloyd
Lloyd 1985 is offline  
Old 28th Jul 2020, 7:22 pm   #3
turretslug
Dekatron
 
turretslug's Avatar
 
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
Default Re: EHT Inverter possibility

It certainly comes into the "no harm in trying, and little to lose" category. Looking into the spec, I think (hope?) that the output capability is 0.4mA as opposed to the stated 0.4A, otherwise Blofeld and the Pentagon will be hoovering them up.... At least for the sake of the little anonymous TO126 driver device pictured.
turretslug is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 4:38 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.