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Hi David, The start and stop levels should differ about 5 V. With start I (and you also I think) actually mean the stop level when the trace is at the left position. On the test scope you look at

Thanks Tom, I will download it. You are right, the Q9070 is on the heatsink. I was referring to the U930 driving via Q908 (and CR908) to reach Q9070. Noted on the connection to be broken for direct

I wish I can use this approach but unfortunately it cannot be used in this case because place that are heating up ought to heat up but it may be heating up slightly more than usual. This approach is

Ed, Thank you for your extensive reply. 2220 is a storage 60mHz 2235 is a 100Mhz Non-storage The power supply of the 2220 is quite similar to the 2235 which I can see from the layout. These are some

Qservice is another good source, their pricing is less than Sphere and order fulfillment is very fast. <http://www.qservice.tv/vpasp/shopcontent.asp?type=2445> Patrick Wong AK6C

A weak CRT can cause this also. ________________________________ To: TekScopes@... Sent: Saturday, January 21, 2012 6:14 PM Subject: [TekScopes] focus/astig off the center. ? Hi, I have

They come up on fleabay for 4/$15 every so often. There's always Sphere, if you want to pay $15/each! If I could get that much I'd be buying up 2445s on ebay just for the knob caps. --Victor

I've become a firm believer in the freeze mist. It really helped me recently find a problem transistor in a 7A13 plugin I have. Oh, and a relatively cheap IR thermometer with a laser dot pointer that

They have heard of analog computers, sort of, but they're treated like the redheaded stepchild. There are a few analog machines on display near the entrance of the exhibit hall (and there are a few

Hi, Am looking for 3 or 4 knobs for the lower front intensity, focus, readout intensity and scale illumination controls for my 2445A. Tek part number is 366-2041-03. Anyone have any spares I can buy?

I recently acquired several 8416 tubes and decided to revive my two Type W plugins. As soon as I started working on them, several discrepancies between the manual and reality became apparent. Most

I also note at least one transcription error!! The Start V for .5nS in the second half should of course be 90mV. Very well spotted on the systematic nature of the offset BTW. I'd been banging my head

Albert, Thanks - you are right there are some calculation errors there - all my fault - no hardware to blame - apart from the grey mushy sort between my ears! Thinking rather more about this, the

I mistyped 35 instead of 36 sorry for the confusion. Since the DMM display is unobtainium unless you salvage one from another unit, I am curious as to which models might display the data on the scope

Geometry is fine. I'll check voltages carefully... they seemed about right but I did a quick check not a rigorous one. tks. lc ct1dmk

Perhaps it was just easier to provide a DC heater supply of 12 volts at half the current of a 6 volt tube in a tubes scope for hum reduction. Don Black.

David, Do you happen to have a multimeter that has an "OUTPUT" terminal, like the Simpson 260 or an old Radio Shack analog multimeter? This is for measuring AC in the presence of DC. It's basically

...measure about 70V. Or you should get about 71.5V on side of that resistor, referenced to ground. Should've been: ...measure about 70V. Or you should get about 71.5V on ONE side of that resistor,

David and Magnus, I'm thinking Q872 and the other 2 transistors are OK. There's just not quite enough base current to turn on Q872, and the others. The collector of Q860 is only 2 volts. It should be

If it actually is something heating up a little and then shutting down, it can be found with freeze mist. I can't remember how many times I have fixed equipment this way with very little trouble