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I have this last 7904 up and running as explained previously. It showed several problems including readout loss, severe vertical compression, A-horizontal failure, and supply crashing when control

A CORRECTION I gave the wrong links for the "Radiotron Designer's Handbook". I gave links to the table of contents only, the full text is available, it is: Radiotron 4th

Anita Abranovic <anita.abranovic@...> added the photo album JFETs substitution for 12au6s in 575 curve tracer ( /g/TekScopes/album?id=299769 ) : Both horizontal and vertical

In very good mechanical condition, lights up when plugged in, controls and buttons seem to work. $100 and I'll ship free (from Austin) CONUS only please. I can't guarantee it since I don't have any

A few things to consider when selecting probes: Check the probe's compensation range against the input capacitance of the scope input. For work in tube circuits check the max input voltage spec of

https://www.ebay.com/itm/306010250361

Mark, I listed the Multiplier and knob on eBay. Barry

Hi Joel, Sorry to say, they are already spoken for. I will let you know if that changes. Regards, Barry

Hi Barry, I'd be interested in buying the remaining V/Div knob(s). The ones I have have lost the silkscreened numbers (1/2/5/10 V etc...). Will pay a reasonable price + shipping to France, of

I just got an email from groups.io saying Dennis is due to be billed for this. 1. Is Dennis still with us? a. If no, groups.io need to be informed who should be billed b. If yes, and he's not

I don't know of a reason to call the 535 best for audio work, but if so, I'd pair it with a 1A7 plug in for it's 10 uV/div sensitivity and variable bandwidth, 2nd choice 1A1 for 5 mV sensitivity with

Thank you, John, Dave, and Richard!? Now that I think about it, I did see that P6006 probe mentioned on eevblog, IIRC. Much appreciated! Jim

I’ve been using the WBT solder on all my Tek repairs and have had zero issues. But I bought my 1/2lb when it was $50 cheaper. And still have over half of it left.

Hi Jim. Always glad to encounter someone using tube scopes in this day and age. I design and troubleshoot with tube scopes as well, although I often reach for the 2465A. Now it would be hard to find

The handbook for the scope should tell you its input impedance which will tell you what probes it can use. Typical scopes have 1 megohm input but not all. Probes can provide voltage range extension

Jim The Tek catalog from March 1967 is what you need. I've had one for years and its one of the best single references for the 500 series stuff that you will find. I see its available on Tekwiki -

Hi, everybody. So at some point I will take the plunge into vacuum tube audio, and according to George Lydeck on this group, the Tek 535A is the best scope ever for tube audio work.? Now, I figured

For AudioPhools, it also MUST contain micro ground meteorite powder gathered in the dark of the moon? by stygian witches. :) ????? Bruce Gentry, KA2IVY

Never could find a product specification PDF... "Halogen free flux" is about all. I can say I have used it on assorted Tektronix ceramic strips, successfully. (Re a 575 mostly, few other odds and

Nice to know it exists. I wouldn't have thought to look for audiophile solder! I wonder what else is in it? <david.w.holland@...> wrote: