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Hi David, The RHS is also far from good. At those 20 MHz you should see no quality difference between sequential and random. I can more or less simulate your random waveform by playing with the

My old HP-130C scope?has two 7586 Nuvistors in it, btw. ? ? ? ? To: TekScopes@... Sent: Friday, January 20, 2012 12:30 AM Subject: [TekScopes] Re: Nuvistors. ? Yes, it may be a 13

kd8dey, That's the 4 pin transistor. Mouser had a listing for Albert's number, but in surface mount only. Digikey's search database must be down this morning. Thanks anyway! Mark

Hi folks, Please could you take a look at the pictures in here: <http://groups.yahoo.com/group/TekScopes/photos/album/248312034/pic/list> All working fine in sequential mode, but in random mode only

Fat fingers abound! ;-) Mark

Thanks Albert. After my flailing around yesterday by asking about a part with a typo in the part number, I'm glad we all got this straightened out! Mark

Thanks for all your help folks! Tucker Electronics has a few of them left and I ordered two, to have a spare one around "just in case." ;-) Mark

.> Jimmy. NO! Assuming you a conventional scope, connecting the ground to anything other than ground may result in a loud bang !! Connect the scope GND to the chassis of the 7603 and use the probe

Hi Jerry, Sounds like you are making excellent progress. I had to work on my TG 501 in the past, and there is no problem powering up the main board while the multiplier board is disconnected. Please

Hello, If anybody know the default setting for S1010 and S1050 inside of? TEK?2797 (no OPT) ? I had TEK 2794 service manual and default switch setting for 2794 (no OPT) list as?below ,?but it

Jimmy. The supply outputs are all about the same as I measured before. I haven't measured the ripple because I wasn't sure how to. Do I put my (reserve ) scope's probes on the large smoothing cap's

Yes, but I think that technology was developed to reduce part heights for denser board stacking, not for faster fasts. Arden

All logic families are designed ostensibly to be output/input compatible. I think someone earlier suggested buffering Dennis's switching pulse with a 74F gate to harmonize the drive requirement for

Hi Patrick, I removed the 5mhz oscillator module and found that it is mounted with 4 pins. My option one TG501 has a 7490(U50) mounted on the bottom of the main pwd. The ground pin is under U50. The

Hmmmm.. Back to the cold solder joint theory? Arden

But NOT speaking broadly, is the 74F input clamp diode and transistor emitter the same, similar, or nothing like what could rectify noise on a floating pin? Arden

Yes, it may be a 13 volt filament is easier to run at slightly lower voltage because perhaps the voltage being twice and the current being half of a 6 volt filament would make for a more constant

There was one tube that didn't cross on your list, Stan, an odd ball type that I just happened on by chance, so I opined that your list was not complete. It would be useful to know what the selection

Phosphorphile posted I dont know what instrument Tek used the 8393 in, so cant comment on an actual TEK unit, but running a13v volt filament on 12 v (provided the emission is high enough so the

David, Happens to all of us. Hopefully, that didn't blow anything. So what are the supply outputs running at now and/or any change in the scope's operation? And can or have you measured for bad