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Be very careful here. There's a reason the Postal Service will not even ship Lithium cells and it is illegal to ship them via air cargo. If you happen to dremel into the cell, not only are you getting

Yes there is compensation circuitry, but this is mainly before the gate and not adjustable. I measured the bridge signals at the + and - nodes with 600mV SW input and no triggering (and shunt resistor

Hi Michael, If the relay is opening again after closing, it is not getting coil voltage from its own contacts. If you burnish (clean) the relay contacts, it will probably hold in until the power

Be careful, the CRT heater gets its supply directly from the big mains power transformer, *not* from the HV transformer. When the isolation is bad then the HV won't start. See many earlier posts about

Hi Chris, I used to demo the 492 as a "receiver that looks like a scope". This made it much easier for the average person who was not familiar with spectrum analyzers to quickly grasp how it worked. I

I picked up a cheap 541 last week which worked, but not very well. The fan had broken free from it's mounts and was sitting on the chassis- I had to beg the guy I bought it from to please turn it off,

This appears to be true with respect to all NTSC test equipment. I have a ton of signal generators and various NTSC monitors and I wonder what they will be worth soon with digital TV coming? Kinda

Greg, Thanks for your good suggestion. The signal at the input of the trigger generator looked great and I assumed the balance circuits was okay. I checked the adjustment for trigger balance and found

I tried again. Since the CRT is completely covered I cannot see any filament working. Shortly before the tube's diameter gets wider some connectors for deflection I guess. Even there some color avoid

The delay relay closes its contacts which energises the coil of a conventional relay which a: shunts the contacts of the delay relay, thus maintaining itself closed and b: disconnects the heater

I know nothing about it, but here's a hint: the 7D02 will surely have some software in the personality module -- probably the disassembler or dissassembly tables, etc. I don't know whether there is

As far as I know there is only one delay relay. It kicks in after the tubes have had a chance to warm. The only time mine ever kicked out was when the thermal protection tripped, which it will do

Anyone out there might happen to have one of these puppies?? The whole board would be even better. If so, let me know what price you want. Meanwhile I'm trying Deane too. Any replies appreciated.

<michael.petereit@...> wrote: so far but try what you suggested. start after around 1 minute a relais was working i the back, below the big fan. After another 30 sec the relais release with a big

Dave, I fond that thread but it didn't gave that conclusion. I used alcohol for slight mud, this scope was placed in a dirty an humid cellar for years without it's coverage. The aluminium is best

Well, all tubes below the CRT are working. I didn't checked the CRT so far but try what you suggested. Btw: The startup behaviour of the scope is strange. On the first start after around 1 minute a

I was recently given a tek 211 portable scope in bad condition. It will not be repaired, as i'm a tube type guy, but will be converted to a scope design of my own, for monitoring purposes. If anyone

Before you go too far with the chassis cleaning and wholesale tube testing, check and repair the low voltage power supplies first (be especially wary of the bypass capacitors across the precision

you might be able to just take the "video" output from the detector and run it into an audio amp for fm just demodulate it by slope detection "tune off peak and use a fairly narrow filter"

deane kidd might have the paper manuals