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Hey! Don't muck with the DAC adjustment, unless you are prepared to do a full calibration! It is not supposed to be +1.25 and -1.25 volts, but rather a 2.500V span. Sure, if you are a

Particularly if you live in an area with nearby FM broadcast transmitters, the average scope probe will pick those up quite well :^) dr

It seems to me like when the trigger knob is in these positions that cause the sweep to free-run, the impulses through T555 ultimately cause Q615 to saturate, putting the scope into the same state as

The Schematics .pdf on the TekWiki site is good but it is for the A scope; any pointers to the 475 itself. Guess still very useful anyway. Am I missing something? Thank you.

...and I believe they are all stacked in the Albert Hall?

As I recall They were rather small And someone had to count them all Thanks, Barry - N4BUQ

Whatever happened to the four thousand holes in Blackburn Lancashire? Raymond

Has anyone got any holes for sale? I need one to put a tower in. My local dealer is out of stock. Glenn

Nuts, I was too late. Another invention of mine has already been invented by someone else who did a better job no less! Dennis Tillman W7PF

The shack heater reference made me recheck the model number - I made a typo...they are actually 455s! Weird “60s modern” style front panel shape, asymmetrical to boot! Now my 535A, that’s a

Yes, I think Chuck (or someone else) pointed this out earlier in the thread. The wider bandwidth the more noise in the trace, this is normal on any scope afaik. --Toby

Your issue 1. has not been addressed yet. The diagram around K600 is somewhat mysterious. Forget the text "to term. 12". The relay tube is probably either a 18NO45T or a 6NO45T. Only in the latter

I agree, possible power supply related issues, including hose are indeed usually straightforward. Thanks for the link to a manual!

I have a 564 , an early one ,complete with 3A3,2x3A6,3A7,2x3A74,2x3S2,2x3B3,3T2,3T4,3T77. I got it really cheaply from someone's barn I think as it had a fair bit of straw/hay inside,it cleaned up

from Tim P (UK) I have three 564s - one 'standard', one 564B rackmount, and one 564B Auto-Erase, along with various plug-ins. One 'scope has a 3S7 / 3T7 TDR setup, one has two 3C66 carrier

There ARE mistakes in there, you can figure it out...I'll be bright eyed and bushy tailed in the morning.

Well OK it's Monday, sue me. I got a lawyer who can...nevermind. Back on topic... So I put the thing back together and MF MF MF, no trace. Also the range lights, the ones that switch when you put a

Dave, wow what a dumpster find, congratulations you won the lottery. Just in case and for future references, I've heard people had very good results removing those stuck knobs by carefully heating

Hi Manuel, Unfortunately my scope does not include the CT option. Also owning a 2247A, and routinely using the build-in counter timer, the CT variant was something that was desirable and high on my

Hi Tom, thanks very much for your input. Bellow just a quick follow up. Is there a test point designated on A5 to check on the 10MHz oscillator? Just for fun and while I am at A5, might as well check