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In case anyone is interested, Radiotron Designer's Handbook as usual has all the answers already. Jaz

Hi Don, I really enjoy the group. Thanks. Jerry Massengale

Tom, I was only able to get enough time to assemble the SMPS into the chassis with just the main board and it runs fine - without the 40W series bulb:). The voltages are a bit off (5.28V, 7.46V etc)

David, A bias tee isn't a big deal at all, but injecting the properly biased RF voltage with the DC and RF currents at workable voltages/currents might be. I think it's an interesting project, from a

Great job. I did the same thing on my 465 after several months of erratic behavior and several cleanups of contacts. In the end I decided to try the chance, took off modules attenuators, took off

There is a nice article in one of the Tekscopes flyers which covers the updates. If nobody else gets it in the next few hours, I'll see if I can find it and attach it to a new message. I have a

It is funny you should mention that. I told someone on the funwithtubes list that the warm up drift he complained about in the 454 was expected because its Nuvistor based vertical amplifiers are not

Hi Priya, Resistances were taken on a nice working 2246 with a Fluke 110 which does not have enough voltage to forward bias the diodes. I tried this Fluke meter on some standard diodes and some

Only Kansas and my high-school girlfriends are flat. :) 73 Jim N6OTQ

Could be. Admittedly all the functionality I have observed is at room temperature here in southern Louisiana. I can but assume they would/may turn quite a bit more brittle at subzero

05/01/2013 00:15 So they would be OK to look for ripple on a 5kV plate supply I have made? -- Best Regards, Chris Wilson.

The 475 is definitely a better scope, but... I really enjoy using the 454. The sharp trace is very, very nice. The thing I like least about it is the DC drift/unstable attenuator balance. You end up

Yes, Craig is right. I only use it on a scope for < 100Hz stuff and if I'm *really* desperate since I don't have a better performing high voltage probe. Neil www.gruending.net

There are major differences between the models.? The service manual won't work for both. I have both (although the 465B is a parts unit) and the differences are so much that it's not possible to

====================== I guess this is the graph, found by Google search <http://www.ko4bb.com/Manuals/Fluke/Bandwidth_Measurement_80K40.pdf>. It's valuable to know what's really happening. Looking at

That is not resonance. A bias tee is not a big deal.

Another newbie question and let me say thanks for the groups patience beforehand!!? I have been trying to research the differences between the Tek 465 and 465B scopes.? Can I use the 465 Service

Completely agree. I ran the SMPS with just the fan for a whole afternoon before I was willing to go further. With the 40W series bulb removed :), the SMPS starts up correctly with just the SMPS and

realistically, the 475 is just a better scope in every way, and significantly newer and better desgined. and you have to love the 200+MHz bandwidth, and the ability to stop it down for lower frequency

Hi jerry, I'm in Australia, shipping costs here would be much more than the scope. It looks like a nice package, I'm sure it will sell. I always enjoy your posts to the group, usually learn something