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

Tek was in the habit improving theirequipment. The catalog pages for the 7904 and 7904A described thespecification differences. I don’t have them at my fingertips but the “A”has greater

Some reasons for the redesign: 1) Better performance (higher bandwidth) because of improved ICs. 2) Simplified circuitry made it easier and more cost effective to build. 3) Greater profit

For work – we are looking for a relatively new (youknow, a square CRT) scope, for as little money as possible. Gotta have a USB port for saving waveforms, four channels,at least 300MHz, and

You should also ask the serial number. I don't know what price you're getting but IMO serial numbers below B012xxx are good for parts only. There are just to many of these at rock bottom prices to

1973 and 1975 catalogs for sale over 300 pages each . $ 8 plus shipping i do paypal for pix go to www.waltbelsito.4t.com page 8 fotos thanks WALT

Hello, the model 7904A is a redesigned and improved version of the 7904. Does anyone know why this was done? Cost, reliability or production margins? Is there any description available except for the

You have indeed come to the right place. I, for example, would like to hear more of the 7704s! Any sampling plug-ins? SMA cables? Tell us more. Regards, Jonathan