[Hallicrafters] Re: Repairing Tek Scopes

[Mark Shaum]

----- Original Message ----- 
From: "Julian Bunn" <Julian.Bunn at caltech.edu>


>I just wanted to disagree with Mike's comment about Tektronix
> scopes. The older models are very easy to repair, and the
> schematics and manuals readily available for free at BAMA.
> You cannot buy a better quality second hand scope, IMHO.

I suppose the only caveat is that should you only own one scope, and it is 
broken, you likely would need to borrow one to properly diagnose and repair 
the broken one!

The older Tek solid state scopes are available at quite reasonable prices 
now.  And they are durable.  I have a Tek 465 portable that I bought 
well-used  from my employer in 1980 when the field service side of the 
business shrunk a bit.  It's been my primary troubleshooting tool for 25 
years, and the only component that has ever worn out is the foam fan filter 
on the rear panel.

The older tube scopes by Tek can also serve well, the tubes themselves are 
the most likely thing to wear out over extended time, but tube replacements 
are generally available.  If you don't mind the size and weight, a Tek tube 
scope can often be had for next to nothing at hamfests.  If you can power it 
up, and get a visible, bright trace, you likely have a fully working unit. 
There is lots of help available in Boatanchor-Land should you need 
assistance with one.

If you go scope shopping, I do suggest at least obtaining one with a 
calibrated, triggered sweep.  I have an Eico 460 but don't find it that 
useful other than for monitoring general AF/RF waveform shape.  It's more of 
a conversation piece as they were quite popular in their day as a low cost 
scope.  A newer scope with a reliable triggered, calibrated sweep and 
calibrated vertical channel can be a waveform monitor, AC/DC voltmeter, 
frequency counter,  etc. - fullfilling nearly every function for most 
troubleshooting work except that of a signal generator.

73! - Mark K9TR
http://www.qsl.net/k9tr