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Hi Albert, I tested your suggested setup and it does indeed have a positive effect. With a 7B53A in the B slot and set up to display a delayed trace, if I turn the B INTENSITY pot fully CW and then

Quadzillatech: The Guernsey scopes and plugins have a 6 digit number. Your number 1009919 looks invalid. Perhaps you can compare component date codes in the FET circuits with those in the rest of the

wrote: What a great idea! I added my model for 351-0449-00, the FG504 et al PCB bracket.

I'm betting that this is a Guernsey Produced scope. If you are certain about it being an original FET (late) model, then the conversation regarding the location and values of R471 and R675 is a moot

as my scope serial number is a million+ i am sure its a fet model as standard and not converted,can someone point me to a link for the service manual for this late model 453?,need to be singing from

Dave, I know how you feel. I once came across a similar clearance where the relatives clearing it out told me what they gave away in the form of HP & Tek test equipment. I commented to them that I

Yes, I believe there was a mod kit to convert nuvistor 453 to FET. I don’t have the kit’s part number. Dave Wise Sent: Friday, November 19, 2021 9:20 AM To: [email protected] Subject: Re:

On the later 400 series Tek scopes (and many others as well), serial numbers beginning in "1" were produced at Guernsey. I do not know if this holds true for the 453. But it is very possible that this

I dont know if it helps but this scope was built in 1965,well the pcb's were.

This has fets not nuvistors,it does have valve/tube doides in the hv supply if that helps,the scope doesent have made in gurnsey on it like some ive seen,incidentaly R467 measures 309 ohm and R776 315

It occurs to me that you may be looking at an early model instrument and a late model manual. Comparing the manuals that I have, the schematics indicate that R471 and R675 are only used on "low"

well,the replacement transistors are fitted,no difference ,does anyone know how to remove the knobs that have no allen grub screws?,i cant see how to remove them,i guess i need to get to the boards

also r471 and r675 are missing on my parts list/schematics also not on the board pics either ref 4.19 /4.20 / 4.21 of the manual,are there different revisions for this scope?,the manuaual doesent

i cant find r471 or r675 on the parts list or schematic,any idea what value they should be?,cheers Paul.

Hi Barry, A month ago this was the "complaint" in your starting message of this topic: I suppose you used a dual time base like 7B53A in the A slot, though my same remarks hold just as well for the

would these work in my 453?,if not can anyone recomend a russian type/part number?,cheers in advance.

Hi Bill, Thanks for the info. I'd like to add that anyone still using Acrobat 9 today will have to be mindful of the numerous security problems in that product. It should not be used to open documents

Last weekend I saw an estate sale listing on CL that had a short, but interesting description and no photos.? It turned out that the owner's father had been a man of many interests and talents, and

The following photos have been updated in the TEK475 Shorted +15V rail (Intermittent shortcut C961 PLUS intermittent interruption in GND rail. ( /g/TekScopes/album?id=270063 ) album

Thanx for your very detailed (and I think time consuming ;-) report. René