Oh, that is the holdoff circuit. I thought I was looking at part of the horizontal timing circuit. Accuracy of the holdoff circuit is not critical so an aluminum electrolytic capacitor will be fine.

A little poking around finds this: Admin Name: Barbara Lynch Admin Organization: Barbara Lynch Admin Street: 1575 Garden of the Gods Road Admin City: Colorado Springs Admin State/Province:

Thank you very much Tom! The resistors look overheated, one of R268 has burnt down (2.98K). Therefore, I will replace all the new 1 Watt and raised above the board. Photo is OK ! Interesting that

Makes me motivated to stick with my financial strategy. I go out, and so do the dollars. -- With best regards Tam Hanna --- Enjoy electronics? Join 8300 other followers by visiting the Crazy

I recently tried to purchase a calibration fixture from a web-site. The item was an 067-0525-02, female BNC to dual BNC male. I Googled this and found a website offering a number of them at a reduced

Thanx David for your detailed answer. I do have a 4uF / 160V film cap, it´s not small (3cm) but there is enough room to mount it in place. So maybe this is the best option. In the schematic however I

Despite several days searching the web I've been unable to find this and the manufacturer seems to have vanished and I'm now desperate - thus the OT post !! The CD with it is XP only :-(  I know

Alright, i suppose I will start with that. I opened up the unit a couple of days ago but I decided to start with the schematics first. It is quite a lot to take in.

Displaying only on the middle 1/3rd of the screen is normal when the beam finder function is used. It is designed to do that in case the trace would normally be off of the screen. The beam finder

Start by measuring the level and ripple on the low voltage power supply outputs.

Tantalum capacitors have better high frequency performance than aluminum electrolytics so to make up for it, an aluminum electrolytic replacement needs to have about 3 or 4 times the capacitance.

Hi Pete, As far as I know the only reference came from me about the Tunnel Diode Pulser which John Addis designed with a special 50 ohm BNC connector to reduce aberrations. Maybe jack knows where

Right. You just need to be aware of the time delay relay in many of these scopes. As you bring up the line voltage, the TD relay will not fire so there will be no HV on some circuits. Until you get up

I had misread and thought that that scope was from the '70s according to his post. Tantalum caps were first developed for the military in the 1930s. Solid electrolyte tantalums were developed by Bell

Doubt there are any tantalums in a 1955 scope. A variac will work as there is no time delay relay in this scope and the rectifiers are solid state (Se or Si depending on any upgrades). Sounds like a

Bring up the ac slowly using a variac - that will help with saving those fussy tantalum caps,

I'm curious where is the reference to tektronix using and are converting to a 50 ohm vs 52 ohm BNC connector ? wrote:

RA flux is much better than regular rosin (RMA). MG Chemicals #835 is great stuff. It comes in jugs or resist pens. The pen is at

I have recently acquired a 465B tektronix scope which worked somewhat ok. The unit powered on, all LEDS worked and I got a clean signal when I fed in a sine functio from my function generator. This

I've not touched a scope in 30 years but have wanted one. I just picked up a 2236 for a mere $46 locally, so I didn't even have to pay shipping. The CTM seems A-OK however I only get a beam if I hold