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That's what I was thinking; that they may have run the heaters off DC to prevent hum and it would be easier to supply 150mA heaters than 300mA in the tube era. Now it would be simple to use a three

David, More below: Your ripple measurements sound OK, so your filter caps are most-likely good. Just remember many of the supplies are not up to normal output voltages, so their output currents are

Tek W Plugin 100-3269, mod kit 040-0447-00: ...improves overdrive recovery characteristics... Just "found" this NIB mod kit dating from 1971, complete with pre-stuffed gold pcb, matched transistors

Low phosphor response or fast decay shouldn't be as much trouble if you can mount some UV LEDs inside the hood so they can be left on continuously during the shot, or right up to it if there's visible

They get flagged as spam by my server which runs Spam Assassin. Try sending in plain text rather than html. Gordon

Hello Heinz-Peter, to read your messages, I always have to leave my Thunderbird standard display and call the source text, there your message is OK and readable, but for some reason it will not appear

On 23/01/2012 03:08, jtjewell83 wrote: > > David, > > More for you below. Hope it helps: > > > > > > > Could also be C866 is shorted, but that would be extemely rare. > > > To eliminate that, pull one

mmh, the second time a text vanished ? In my own (yahoo) return copy, the text was there. After i tried to send the text again? - gone ??? strange behavior ... ------------------------------- Ok,

"Dennis Tillman" <dennis@...> wrote: I just tried banging on mine (with the filter off) using a big old Honeywell Strobonar that used to hang on a press camera. I've no doubt I fed it a bunch

You might want to purchase this: http://www.ebay.com/itm/Tektronix-475-Oscilloscope-Manual-ORGINAL-/28081&#92; 2488419?pt=BI_Oscilloscopes&hash=item4161ba86e3 <http://>

I did solve one problem with this little UV LED experiment: I now know how to take a photo of the Wiltron 640 RF Analyzer CRT. This instrument is built into a Tek 5000 series scope with a special

Ed, Brad I didn't think about the plastic in front of the CRT. Removing it makes the 7934 storage CRT glow nicely. Removing it from the 577/D1 makes the phosphor glow faintly in PURPLE! I didn't

Hi Brad, Correction to my original post where I said: "The other LED I tried was a 485nM one I just got." I meant so say: "The other LED I tried was a 385nM one I just got." 385nM is considered

Jerry, why you don't use empty (blind) panels ? Peter ============= Hi, I am building some 7K plugin kludges and need blank front panels. The 2 1/2"x5" panels with the turned up ends would be my first

Ordered a service manual, however it looks like a Lithium module on one of the end boards - made by Renata and marked 3V and "125-1". I can't find a data sheet for this thing, but I think its actually

Yes, UV LEDs are the way to go. The old school cameras we discussed had plenty of UV from actual UV lamps, or the high UV content from a xenon flash. The other variable is the UV loss in the plastic

To be honest I didn't think of that possibility. Anyway, there was a lot to learn from such a silly bad contact. Albert

<snip> Hello, Dennis-- Have you tried using ultraviolet-emitting LEDs? IIRC, one of the --HP-- oscilloscope cameras used a UV emitting lamp to light up the screen's phosphor and show the graticule.

During the discussion of the 576 vs 577 curve tracer I mentioned the 577 graticule was not illuminated which I find annoying every time I want to take a picture of device characteristics on the CRT.

Take care when you test power supply.I had repared 4 Tek475. But with the last something wrong occured the K tube filament burned!!!Something I d never explained as I have more than 40 years