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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:

While going through another crate of Tektronix gear I came across this board, which has the legends "GPIB", "TEK T1", and "R-0291-XB". My google fu might be weak but I can't find any hint to the

Yes, solid state

By "diodes" do you mean solid state diodes (vs. tube diodes)? Thanks, Barry - N4BUQ

no the idea was to move them to a new location......hopefully they will be put to good use. Renée

A few other variants. Product Mod Description 453 120H Sawtooth out. 453 l27C Internal Sync Separator for TV applications. 453 l52J Special panel with "Property of Friden, Inc." lettering to be added

Guess I priced them too cheap!! That's GOOD. Cheap is GOOD!! They have been bought. Thanks!! -- Kim Herron W8ZV w8zv at goldenradioservice dot com www.goldenradioservice.com

Looking closer at the MOD703K doc, it shows diodes and not tubes. It appears the the MOD703H also has diodes on the HV assembly.

Thanks. I noticed the -A after I posted and could not correct it. CTR instead of CRT as well ;-) Looking at docs, it appears the the tubes were used in the later (20,000+) 453's as well. Now I am

All of the 453A (note that there is no hyphen in the model number) examples that I know of have solid state HV rectifiers in place of the pencil tube rectifiers, leaving the CRT as the only vacuum

Ray M <raymond.muno@...> added folder */Tek 453 variants*

I added the type study spreadsheet in the Files section. /g/TekScopes/files/Tek%20453%20variants/Tek%20453%20Type%20Study.xlsx

I the three Tek 453 scopes. Two are MOD703K, one is 703H. I find the docs that show some differences, along with changes. In the family, I find these variants 453 SN < 20,000 453 SN 20,000+ Major

I think that means a checksum failure. In other words, it’s detected that the data has corrupted in the non-volatile RAM. That’s typical of battery failure causing lost settings, but may happen if