" The TDS5054 scopes were socket 370, not socket 478. The B scopes were socket 478." Well fundlebark! I went to upgrade today. When I pull the fan, the chip came with it. Luckily no damaged, as far

Yesterday I received the set of small ceramic capacitors I had ordered, intended to fix the parasitic oscillation in the horizontal amplifier. I stacked three 50 pF ceramics in series to replace the

Albert, Raymond, a belated thanks for your replays. I indeed made a mistake identifying the hybrid 155-0077 that I could not find a schematic of it. But the darkened sketch of it in the manual is

Thanks for that, reading the section of the manual around the diagnostic tests is not very clear to me - I have a hunch that at some point the penny will drop and then I can see what the text was

Albert, That is the burning question in my mind? How is it possible to have two different voltages on E1 and E2 if they are, in fact, a single common emitter? Unless there is a component inside

Thank you for the replies. a couple clarifications; While the timebase behaves normally with no vertical amp present, giving full horizontal deflection and variable sweep rates, with a vertical

Well said, Ernesto. A feeling shared by many in this Group. I'd like to add the satisfaction that participating in these Groups gives. Raymond

Hi Paul, Thank you for the information. The price of this cart $35 is perfect, probably less than the shipping cost to Houston. I have been looking for this cart for my recently restored 547, which

I care very much. I'm an old man and strongly believe in being polite. I'm older than every professor from whom I am presently (or in the last few years) taken a class. Each is called Professor

RL, Michael, In the datasheets of the mentioned types I don't see any asymmetry in the role of E1 and E2. Then why is a 0.7 V difference between E1 and E2 present in at least 3 tested SG503s? The

Raymond, I am grateful to Tektronix for having produced equipment that holds up so well with time and maintains its excellent functionality. And if some adult mortality has brought down their price,

RL, So basically, TEK designed the circuit to fit the available parts that met the required specification? As usual, I was looking for some very complex reason for them using that particular part.

Chuck, I could never fix truly complicated failures with just my eyes, nose, ohmmeter. It always came with a dose of satisfaction and now... with some comment on tekscopes, ha ha ha. When I was

Thanks for the background on the Tek Orders. I have downloaded these and will see if any of the mods were installed. Thanks to Bob C about the HV. That helped me from going down that rabbit

There is no fan, but thanks for the suggestion. I might look at putting one in. I had not noticed that it was pre- wired for it. -- Bill Ripley, KY5Q Embedded Systems Engineer / STEM Mentor

There are dual emitter bipolar tetrodes - 3N74, 3N75, 3N76, and 3N127. All low power. However, from the schematic, there doesn't appear to be any reason why dual emitters might be required, except

Saw this on Craigslist: https://detroit.craigslist.org/wyn/tls/d/canton-vintage-mobile-cart-welder-heavy/7112495868.html -- Paul Amaranth, GCIH | Manchester MI, USA

How's your ripple? -ls-

yes , a good thing , however they breakdown not to Bad design ,but low Peak voltage rating ,and if ripple IS présent on top of normal désignés voltage , then they breakdown... Envoyé depuis mon

Shhh! Don't tell anyone! How often can you fix truly complicated looking failures with just your eyes, nose, and an ohmmeter? -Chuck Harris Raymond Domp Frank wrote: