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When I got my 453 mod703H many years ago, I contacted Deane Kidd about a manual. He told me he did not know of one and info on this mod was scarce. My observations indicate the 703H has a larger CRT

I got a TM502A that is in working condition but was dropped at some point. The spot welds that held the power transformer bracket gave out (I assume from being dropped) and the weight of the

I just picked up a 2465DVM from a TV station nearby, I have a few questions but I'm mostly looking for the rear feet/cord wrap that is supposed to be on this scope. The bottom parts of the feet are

The following items have been added to the Files area of the [email protected] group. * /Tek TM500 Power Module Tester 067-1201-99 New Ver/Tek 067-1201-99 Power Test Module Manual v1.9.pdf (

Still looking for one of these SC502 transformers if someone has a parts unit? Thanks! Jared

Gordon, I did use 6.3VDC in the scope. That is because I used a toroid transformer that has two 6V windings, not 6.3V. Under load, the 6VAC dropped a bit too much. The laminated transformer you use

Hi Folks: Just did the removal and 'floating' of the focus pot, but alas, the voltage did not improve. I was hopeful, because I can recall getting a very slight tingling sensation when leaning on the

I managed to find 2 exactly the same SRAM chips and ordered these. I will mount these on a socket. In the mean time I will give it a try with a 3V (a little lower voltage than the Li) replacement

If running from a 12V battery with resistors obviously...

Just keep in mind the instantaneous voltage to the 6.3V filament will be excessive until it heats up and the resistance increases. You could blow the CRT filament.

I'm thinking about how to make a circuit to read the voltage directly from the CRT readout, keeping it simple. It could have many other applications for the other plugins.

Gerdy, If you want to leave the battery in, fine. See if your RAM is still working. They can go bad. Do a calibration to see what that does. Mark

That is an interesting supposition. As I said upstream, all comparisons I can make leave the MOD703K as almost identical to the 453A-5. I do not find much that references the 453A-5, but there is a

It could be that some of the changes which later appeared in the 453A were already in development and were first introduced in military contracts. -- Dale H. Cook, GR/HP/Tek Collector,

In the document up on TekWiki for the MOD703K+MOD703H It states: TRANSFORMER T1101 Change 120-0470-00 L. V. Power TUBES V952 Delete 154-0051-00 V962 Delete 154-0051-00 V979 Change 154-0492-06 CRT,

However, the 453 MOD703H I have uses solid state diodes. It is the original style in terms of CRT and controls, but has many board changes internally. Of the ones I have, it is a bit more mysterious

The pencil rectifiers were used in the later (serial 20,000+) 453s. Only the Nuvistors were replaced (with FETs) in those 'scopes. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA

Mark, Not sure if I understand this correctly: when I measure 3.6V on a 3.5V battery (and 3.45V on both of the SONY SRAMs) can I not safely conclude that the battery is still OK?

Gerdy, Even though the battery shows the correct voltage, its age is another matter. Mouser has 667-TL5903P as a replacement that is heavier in capacity. I had the 7000 fail in my 2440. This battery

Looks like it's from a TM5000-series plugin. Probably something like the DC5010; certainly from something that had a non-GPIB variant. Dave Casey [email protected]> wrote: