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454 or 454A. Sharper trace. Unless, of course, you need every last bit of bandwidth.

That's true, as long as you're checking/adjusting. I used my P6015 for both checking/adjusting the power supplies as well as looking at the HV to see what's there if I'm troubleshooting. Plus, it's

David DiGiacomo <daviddigiacomo@...> wrote: I don't have any references handy, but memory says that was the case for both 453's and 454's. I think the A version of both were FET's. -ls-

"Bound water and ice have critical frequencies at about 10 MHz" "That is not resonance." Sorry for using the wrong terminology.? I am not an RF engineer.? I don't even play one on TV, but not

The 454A also drifts a lot, compared to later scopes. (And BTW, I think there are some late model 454s with JFET front ends.)

Well it is a RCA WG-289 and I didn't replace the shunt resistor so much as add one. I think the probe originally came with shunt resistors in the box but it turns out it was for another probe and

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