I was not aware of the similarities with the 7104. I know a similar thing happened when the 7704 changed to the 'A' model. The CRT was the same one used in the 7904, and I think the vertical amp

Here's what the 7904A MSR dated May 83 said: //I. Product Description and Specifications The 7904A will replace the 7904. All spec's will remain the same. The 7904A will have the following

Hi Guys, I am having some fun with a 2465B that does not power up. I swapped the PSU out of a working 2445A and that would not power up either. I did find that there were some option power connectors

There are major internal changes between the non-A and the -A versions. Tek moved across to using Hypcon hybrids from the earlier generation hermetic canned types. In addition they moved the HT from

It looks like the measurements you are seeing aregood. Without the 33 volts, the inverter will certainly notwork. The negative to counteract the two plus supplies(and the HV adj from <10>) comes

I don't have the specs in front of me to compare, but with some effort I could find an old catalog with the non"A" model to see what changed. There is one thing I do know. At the time the 7904 went

Hello Group Members, I have a Fluke (Montronics) Model 207-5 WWVB Receiver/Comparator with various problems to many to mention on this list, if someone has any experience with this model and would

Jerry, I see sometimes you post to TekScopes, sometimes to TekScopes2, but rarely to both. And if only one, isn't TekScopes the better choice (larger membership)? Is there method to your

Hi, An SC503 I recently bought did not power up and the +33V fuse was blown. After replacing 2 transistors and a shorted tantalum in the +5V regulator, the LVPS is good and powers up. I replaced

You are headed in this direction, but I would suspect filtercaps that have dropped in value. At light load, they would still work okay, butat heavier loads the ripple may get so large that regulators

from Tim P (UK) Hi, I am in London; I would have the 1S1 and 1L10 off you if you want rid of them. How much would you want ? kindest regards Tim P

Does anyone have any advice on the "picky power supply" issue? My power supply seems to be within spec. The plug-ins I'm using work fine on a 7514 and a 7704A. But on the 7904, if I try to use a

Hi Dan Does it have to be 300MHz We just picked up an MS2024 for £3064, ex demo from Imex in the UK,it only has 8 preceding power ups on it, and is less than a month old, so asnew and with full tek

Hello group, thanks for the replies. Firt thing, I am in the UK which limits posting stuff around. At the moment I am looking at a 547, 585A (sure it is an A, can't see the front at the moment) and a

The later 7904As had a REALLY NOISY PC type fan at the rear. Almost as raucous as the 2430A (which is deafening). The early 7904As with the same fan type as the 7834 etc. were nice and quiet. If

Hello! I am in need of a 496 attenuator in order to finish my repair of the unit. Please, could somebody help me?. I could also use the attenuator pads only. Thanks and best regards, JOSE -- 73

Brain fade. Was thinking the 7904 had aseparate power supply fan. You are correct the 7904A adds an air stirrer onthe right hand side (when faced from the front). - Greg

My 7904 (non-A) has no fan. The non-A's appear to have a picky power supply; my non-A is in tick mode(which has been resisting repair... and my -A is behaving nicely :-)) Dave

I'm no expert on the 7904, but I believe it's the other way around. The later model 7904A is the one with the fan. I assume it was added to improve instrument cooling. --Victor

You can go a lot cheaper if you give up the USB port. It came relatively late in scopes and you will be limited to very new models. It is convenient, but for the price difference you can likely stick