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One thing, you say that as soon as you turn the voltage up, the relays clatter, and the voltage goes to max. That is to be expected, as the relays are controlled by a series of voltage comparators

After that highly unadvisable session of parts shotgunning, you may now be looking at both the original problem, and new problems that you introduced by unnecessary parts swapping. As an old farmer

I have a ps280 I need some help with, completed recap, new op amps, new transistors including pass, new diodes including zeners. Rails are good, +/- 15 & +/- 24. Master side works well. Slave side

That's what I recall. I have had several GW Instek supplies that were badged by various named manufacturers, such as B&K, and I rather like them. However, those I have fixed have had several

ALT modes on the Horizontal Mode control, and has a Trace Separation control. It's a 547 copy. Pretty strange; Tek ceramic strips but not Tek cabinet parts; this was not built by a Tek alum.

The Tek PS280 is a rebadged?GW Instek GPC3030D power suppy.? Don't know if the?GW Instek folks initiated the design & production or if it is another rebadging by them. It is obviously a Chinese

I'm here, but I don't do chats... I don't have any specific knowledge about the PS280, but as I seem to recall it is a rebadged Chinese made power supply. How can I help? -Chuck Harris

Don’t really use chats here – just ask Chuck to contact you … He’s here quite a lot. D. Sent: 02 October 2022 05:40 To: [email protected] Subject: [TekScopes2] New Chat: Ps280 #chat-notice

I have a ps280 I need some help with, completed recap, new op amps, new transistors including pass, new diodes including zeners. Rails are good, +/- 15 & +/- 24. Master side works well. Slave side

A new chat has been created: Looking for chuck harris for some help on ps280 *By:* mystic96 <clbarber1@...> View/Join This Chat ( /g/TekScopes2/chat/9803 ) Do not reply to this

please do. The Craigslist ad ( https://rochester.craigslist.org/ele/d/scottsville-large-dual-trace/7538354343.html ) is still active, which I assume means it’s still available. — Jeff Dutky

I would like to save it if its still available. Vince

From what i see, it has a transistorized vertical deflection, no obvious delay line, James Millen Co. crt shield. I suspect it was a prototype but not Tek, Lavoi, Hickok, or Jetronics.

“Has many 12AX7 tubes as well as others. . . .” The tube vultures circling and audiophools salivating. ?It would be nice to see this one saved, if for nothing else as a parts machine.

My guess is that it is an early prototype where the sheet metal was not yet done

I saw this listing on Craigslist. It looks like a custom-built 545B, 546, or 547. Maybe something a Tek employee built in the spare time? It appears to be working, and it’s a bit of an interesting

Bonour, Start with all the other PS lines, at U119 on A1 main board. One (+50?) is the main ref. Are any other busses off spec? The serv manual has a fine flow chart to debug each section, the PSU

I'm working on fixing the 2nd 2465A supply in two weeks. I have a strange problem. I replaced a bad cap, but the psu still goes into tick mode even with a 2 ohm load on +5Vd. I've diagnosed it down to

The original style of capacitor was a metal can with lugs around the bottom edge.? The capacitor sections were inside, and came out to lugs on a phenolic plug.? These were quite common then, but

You can bought only de CCFL lamp De: [email protected] [mailto:[email protected]] En nombre de Steve Kranish via groups.io Enviado el: viernes, 30 de septiembre de 2022 15:54 Para: