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I have been unable to access this site for some time. Does anybody know what has happened? John Foster

I have a question about the A5 trigger generator sweep logic board differences. I have two 466's with out the DM44 with the same trigger board 670-3324-00 boards. I have a 464 with a DM44 with the

There are millions if not billions on DC coil relays in the wild with integral back-emf diodes working just fine. There are certainly design misuse situations that can cause field failures. That

I think it worth pointing out that injection molding knobs would not be that difficult or expensive to set up for small production. It requires a heating chamber, a mold and a lever actuated pump.

I have never played with a 556, so I don't know the specifics..but assume you have checked/replaced the caps where necessary. regards Rajesh -- /Rajesh

Oops I missed the plastic skirt detail... that complicates things a bit. I think I could replicate this as well... I'd print this in clear resin and then polish it, or potentially turn it out of

I've gotten reasonably good at 3D printing tektronix knobs. I 3D scan the original and use this as a reference in CAD. I then print the knob on a resin-based 3D printer, and airbrush the final color

Hi Tam, I was musing about replicating them more than seeking replacement knobs. I am in need of knobs for some restoration projects but they are months (or even years) away from starting. Thanks all

Apologies... two missing details... I couldn't see any obvious damage under the HV cover, (no charring or whatever), and I don't clearly remember if it's +100 volts or -100 volts that I measured on

Hey all, I just acquired a 556, but it's having some fairly serious issues. Before powering it on, I checked all the supply rails for shorts with a meter, and checked the power plug for shorts as

I would say go with the X/Y capacitors and pick ones that have the highest AC and DC voltages you can find which will fit physically. Be aware of any special local and national electric codes for

I have 2 original manuals 5A15N Amp and 5B10N Timebase. (so sad I don't have that mainframe anymore!) Free - but postage to O/S will be about $20A contact hugh@...

"I have now seen two 2465 PCB blocks with a burnt-out on/off switch." "The damage is caused by the arcing across the now-separating terminals, when the machine is switched OFF." No manual and not

There is a small tektronix knob on thingiverse, I haven't tried printing it yet, but plan too as I'm in need of a knob for a 2213... Getting the color right is always the key, but 3d prints can be

3. How can there be a final verdict when the problem is not yet defined? -Chuck Harris M Yachad wrote:

An earler post asked about using snubbers to save the contacts of switches & relays. Many of the same issues apply to both relay & switch contacts. I looked into factors reducing relay contact life a

Hello John, could you send us a few photos or even lend us such a knob? I am pretty sure Sir OConnell can do something for you! Tam --- With best regards Tam HANNA (emailing on a BlackBerry PRIV)

So what's the final verdict? 1 or 2? Mounted across the switch terminals, EITHER 1. A 10nF DC rated capacitor up to about 3000VDC OR 2. A 10nF AC Class X/Y capacitor rated to about 500VAC ??

After about two and a half years I was wondering if you have made any progress.

Well, it's all good, as they say.? Nice to learn a new phrase. Thanks! Jim Sent from my Verizon, Samsung Galaxy smartphone