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Fabio, It would be nice if we could find a replacement for these, even if an adapter board was needed. I worry about this just about every time I use my 7A13 so I end up using my 7A18 ( with the

Thanks Roger, One question... As my Jig is not ready yet... At first glance, I obviously considered using a reverse diode to contain the back-emf of the coil... but in face of your suggestion (to

Fabio, I built such a relay exerciser to use with the similarly packaged 15V DPDT relays in a 7A11. I just had two LEDs on the NO and NC contacts and it was visually obvious which relays were good,

Hi Dave, Thanks for the advice. I`m building a small test jig on a breadboard, with a 555, to exercise them and also to characterize their contact settling. I wish to be able to tell, from the

Well, never say never, I guess, but in the current state of things, the 547 does not appeal much to me. Sure it has more BW and Triggering features with its tunnel diode.. but... features and

Yeah, it does suck. FFS! Wonder if someone should Email them and offer a better deal? www.cwgsy.net/private/mandoline "Error 008472. Horrible bug encountered. $Deity knows what happened."

Oh, not the 547?

These are rack type and have nice folding aluminum handles... photos of two serial numbers attached. The photos have names starting with serial number. they both can show some readout activity,

Hello Leon I did check both 15V supplies (which is all that the 7A13 uses for the relays). Both of them spot on plus or minus < 0.05V, with less than 5mV noise / ripple (measures taken directly from

Check the supply voltage to the relay's for voltage and ripple both cold and warm. Sent from K5JLR

Before surgery or replacement, you can exercise them and see if that cleans up the contacts enough. Just buzz the coil with a square wave for a thousand cycles or so, and reinstall. That did the

Hello Folks, Thank you to all your input on my previous topic about the 3rd most useful plugin. Not only it clearly demonstrated how regarded the 7A13 is among many users, but it also gave me the

Thanks for all the replies people, I am overwhelmed ! LOL Didn't expect that many replies in just 24H, this list never disappoints ! :-) Too bad that only the 535/545 booklet was scanned, but all

My 575 has adapters I It, too. No little manual... that would have been fun! Phil, N6OMM

Funny. Theres a similar spot on the 575. I use it to hold adapters...

Coming back to my message from 8/ 23/ 18, in the mean time I checked even more, so that now I am pretty sure that the HV trafo T1430 / TEK part # 120-0471-00 is the cause, since inputting a pulse

Wow. Great thoughts. I had never considered electeostatic attraction of the high voltage. Of course! I'll do a power supply repair and clean up the dirty high voltage areas and try it out.

It is easy to say that the parts are valuable, but actually storing them, and inventorying the parts is a daunting task that greatly exceeds what you guys are willing to pay, for the individual

Here is a pic from a 585, operators handbook inside its nest. /g/TekScopes/photo/72360/0?p=Name,,,20,1,0,0 Regards Rajesh

Let's see if I can remember this. The stability control on the 500 series was a voltage input to an astable multivibrator which would control the threshold of the trigger amp/generator. This would