Re: Oscope advice

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Chris Arnold by way of Terry Fritz <teslalist-at-qwest-dot-net>" <chris_arnold-at-msn-dot-com>

A while back I got a decommissioned Tektronix 7704 A 'scope, and it seems 
one of the channels is in need of callibration - square waves aren't so 
much square ;).  Where can I dig up information on how to recalibrate 
it.  One other thing, on the lower horizontal timescale settings - like 
into the nanosecond ranges the scope seems to become unstable and the 
display will suddenly become unreadable.  What is causing this?

Thanks a bunch,

Chris


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Oscope advice
>Date: Mon, 11 Aug 2003 13:18:01 -0600
>
>Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><jimlux-at-earthlink-dot-net>
>
>465s are great scopes (as indicated by the remarkably high Ebay prices for 
>a way obsolete (commercially) scope)..
>
>One gotcha, though... make sure the tube is good and not burned.  I'll bet 
>a replacement CRT for these is quite expensive.  The other thing is to not 
>even bother buying one of these that isn't working, thinking you'll fix 
>it.  You'll have a tough time finding replacement parts (particularly 
>transistors and such for the vertical amps).
>
>However, if it's working, and just needs readjustment, or recalibration, 
>then, have at it...
>
>
>At 05:29 PM 8/6/2003 -0600, you wrote:
>>Original poster: "Peter Lawrence by way of Terry Fritz 
>><teslalist-at-qwest-dot-net>" <Peter.Lawrence-at-Sun.COM>
>>
>>Terry,
>>       I'm thinking of getting a used Tek 465 scope for tesla coil
>>measurements. Do you have any comments on that model, or any related
>>advice.
>>
>>-Pete Lawrence
>>
>>(ps, feel free to post response to tesla list if you think others will
>>be interested).
>>================
>>Hi Pete,
>>
>>Tektronix has never made a bad scope ;-))  Avoid those giant ones that 
>>are bigger than a cow.  Any of the smaller (12x18x8) style CRT scopes are 
>>great.  I have long forgot which is the 465...  I looked on ebay and 
>>those are great scopes!  They don't have fancy microprocessors ore 
>>anything but they don't let you down.  Try and get the service manual if 
>>you can incase you ever have to fiddle with it.  But they made zillions 
>>of those things so everyone knows how to fix them if they ever were to break.
>>
>>Cheers,
>>
>>         Terry
>
>
>

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