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Well thanks for all the help. I was able to obtain the 7177 style board and it fixed it. So the second model was either incompatible or bad. I'm sending it back to the seller...

Thanks, that's exactly what I was looking for. Andy

Thanks, Dennis. Heh, it does seem like something that would encourage strong opinions :) (Bluntness is appreciated.) What you say figures, given how glad folks are to get rid of them! Interesting toy

We had a thread here recently on a 456B with no sweep. In that case it turned out to be in the A sweep generator, see <https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/112561>.

Huntron Trackers are a joke (pardon my bluntness). I am astounded that they can charge so much for something that does so little. Dennis Tillman W7PF

647 EHT transformer info posted to the group photo section (I hope) I am pretty sure the transformer is same for 647A scopes Chris HJ

Has anyone ever been able to find the winding specifications for any other HV transformers (specifically the 647)? It seems like it would be good to find and archive as many as possible before

On Mon, 15 Dec 2014 13:57:48 +0000, you wrote: >Bert, > >> The recent "design ideas" discussion led me to an announcement of a IGBT >> that does not require a snubbing circuit > >There have been

I believe 2 amps has been suggested when 5v is the only extra min load. My extender uses 4 ohms but that is with 20s on the 15s and 500s on the 50s. Jerry Massengale

2 Ohms? 2.5 amps? Is that high a current what you meant? I guess it's just 12.5 Watts, so OK...

Dave: Many thanks: I've sent you an off-list reply. John

Thanks! that is just what I'm looking for at this time, will order a few this week. Mouser shows 995 in stock. The application is in special purpose power supplies, small quantities.

Is this repeatable? When you connect the calibrator to the scope in 'chop', does the sweep look right? E.g. is the signal in scale and linear? The service manual specifies to measure these in

Bert, There have been IGBTs out there for quite some time, that clamp overvoltage not by avalanching in the main device, but by intentionally turning the device partially on, by means of a zener

Hi, p20G 7 to 9 should be a very small resistance but not zero. This the lamp circuit. The readings you gave look okay. Add 2 ohms from the +5v line to ground and see if the 7704a will power

Power supply voltages in test points are in tolerance. +5v reads 4.99v

Power supply test points? Especially the +5. Tom

Hello to all the group members. My tek 465 stopped working recently and I'm trying to find the offending circuit. There is no horizontal trace on both channels on standard settings with auto

HI Jerry, It's all in the spreadsheet but it pretty much boils down to this: P20G3 Ground P20G6, -50v, 13.2k P20G1, -15v, 124Ω P20G2, +5v, 86Ω P20G4, +15v, 124Ω P20G5, +50, 1.7k These were