ill look into 3-in-one oil, i think ive seen some before around the machine shop at my university.
I see that you painted the carts of your 555 scopes? this might come off as another dumb question, but are the two provisions for plug-ins on the 555 cart just there as a holding rack for 2 extra plug-ins, or is it actually possible to somehow connect those plugins on the cart to the actual scope?
I appreciate your offer, and as it turns out, i might actually need a part. the day i turned it on, at my friends house, I dropped one of the white little things that the outside panel screws get screwed into, i just tried to find it in the parts list, but I dont know what their exact name is.
-Robby
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--- In TekScopes@..., Keith Knox <hptekman@...> wrote:
Hi Robby,
??
At the present time I am working on 4 Tek 555 scopes. I have 3 of them working, 555 #4 is not working yet but will be soon.
??
As for the fans I use a drop of 3-in-ONE oil and find that it works very well. Fans must spin freely or they will not run or they will run slowly.
??
Test points for LV power supplys are on the bottom of power supply unit.
??
Because the Tek 555 is a dual beam scope, there are two -1350 HV adjustments. One for each cathode.?? The HV Anode lead that plugs into the CRT will provide about +8650 volts.
This totals out to 10KV accelerating voltage.
??
When you get your Tek 555 working,?? remember that the upper beam will only write to the upper 4 cm of the crt and the lower beam will only write to the lower 4 cm of the crt.
??
I have some spare parts for 555 scopes.?? Let me know if there is anything you need.
??
Have attached??photos of my three working 555 scopes.
??
Keith
--- On Fri, 7/6/12, dutchbosstard <childwhereugo@...> wrote:
From: dutchbosstard <childwhereugo@...>
Subject: [TekScopes] Re: Just got a tek 555 for free, and in need of some advice!
To: TekScopes@...
Date: Friday, July 6, 2012, 10:01 PM
??
awesome. so when i get it back to my house ill carefully hit it with 40 psi. im guessing that shouldnt damage any tubes as long as im careful. My air compressor is sanborn reciprocating compressor - ive never noticed any oil in the lines, only a small bit of moisture from when i drain the tank all the way. it also has a air filter on the input.
so i guess ill just utilize a dry cloth until i get the scope back to my house.
a few questions about the test points - when the time comes that i power up the scope, where are the test points for the low voltages from the power supply? are they in the PSU box? or are they somewhere inside the scope? also, when i opened up the case yesterday i found the -1350V test point for the CRT, but I was under the impression that the total accelerating voltage for the crt is 10kV. where is that test point located, and should i worry about it?
also what fuses should i see for the main fuse, and the filament fuse in the PSU box?
thanks,
Robby
--- In TekScopes@..., tubesnthings@ wrote:
Valid concerns! Set air pressure no higher than necessary, say below 40
psi.
Use caution and common sense - 40 year old dust doesn't belong in your
lungs - do it outside and wear a mask.
In a message dated 7/6/2012 1:43:15 P.M. Pacific Daylight Time,
childwhereugo@ writes:
since i have an air compressor at home, should i try blowing out all the
dust? Ive heard that you can do this to electronic equipment, but i am kinda
terrified to do this since i dont want to have anything become
unconnected, or cause anything to short out, or worse yet - damage a tube.
are these valid concerns, or am i overacting? my air compressor is usually
set to 100 PSI.
