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Old 11-11-2010, 09:17 PM
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Philco 7020 3" portable scope

I recently picked up this little 3" Philco 7020 oscilloscope. The manual is dated 1952 and has "Television Home Study" on the cover. The manual covers basic scope theory then focuses on using it for TV servicing.

I don't have any real use for it, but I kinda like it and will attempt to restore it
Luckily, I also have the service manual. It's actually fairly complicated for such a compact scope.


I'll scan both manuals shortly. I'd better hurry before they disintegrate


It's pretty tight inside!


The 3RP1 is directly soldered in. Probably no room for a socket.


Lots of nasty old caps. New ones should arrive tomorrow.
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Last edited by bandersen; 11-11-2010 at 09:27 PM.
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Old 11-11-2010, 10:35 PM
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Some time ago, I had a similar looking 'scope branded "Waterman". IIRC the CRT did have a socket, perhaps a cheap "wafer" design, that might break easily.

Cool Find!

jr

Last edited by jr_tech; 11-11-2010 at 10:38 PM.
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Old 11-11-2010, 11:02 PM
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I like it. I have an old DeForest scope of similar vintage I want to fix up one day.
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Old 11-16-2010, 01:07 AM
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Thanks. It's slowly coming along. The hardest part was getting the hardened rubber bezel of the CRT without breaking anything. I liberally applied some ArmorAll and let it soak in for a few hours. That softened it up just enough.

What I thought was dirt turns out to be phosphor loss


Then, I had to unmount every control to get the chassis out!


At last the fun can begin
I scanned the instruction manual and uploaded it here



Quote:
Originally Posted by jr_tech View Post
Some time ago, I had a similar looking 'scope branded "Waterman". IIRC the CRT did have a socket, perhaps a cheap "wafer" design, that might break easily.

Cool Find!

jr
Cool. Is it this one ? http://cgi.ebay.com/vintage-waterman...-/140476473677
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Old 11-16-2010, 11:35 AM
Don Lindsly Don Lindsly is offline
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The Waterman in the link is a much simpler 2 inch scope, using 4 tubes total. The Philco version, built by Waterman, is designated the model 7019. They are virtually identical.

The 7020, 3 inch scope was renamed the S8200 in later versions. It uses eight tubes.
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Old 11-16-2010, 11:42 AM
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I vaguely remember seeing in Fair Radio catalogs of years past a Navy scope- USM/OS-3- that looked a lot like this l'il guy...I think they made both Tooob & SS versions of it. I had a Waterman pocketscope, never could find probes for it, eventually gave it away.
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Last edited by Sandy G; 11-16-2010 at 03:57 PM.
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Old 11-16-2010, 01:46 PM
mbear2k mbear2k is offline
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Cool scope. And interesting in that I was reading an Philco "Television Home Study" guide/pamphlet last night that references that exact scope throughout. If you want the guide to go with the scope, let me know.

Mark
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Old 11-16-2010, 08:12 PM
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Wow, what a job to get it out of the case! Cool scope though. Looks like the silverfish were making a meal out of the manual!

Gilbert
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Old 11-16-2010, 08:42 PM
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Quote:
Originally Posted by bandersen View Post
I'm not a 100% sure, but I think that it was a 3" Waterman rather than 2". A friend had a smaller Waterman or Philco that was really cute, and IIRC was blue rather than grey.

jr

Last edited by jr_tech; 11-16-2010 at 08:47 PM.
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Old 11-17-2010, 01:30 AM
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Quote:
Originally Posted by radio63 View Post
Wow, what a job to get it out of the case! Cool scope though. Looks like the silverfish were making a meal out of the manual!

Gilbert
Ah-ha - so silverfish make holes like that in paper ? Didn't know that.

Quote:
Originally Posted by mbear2k View Post
Cool scope. And interesting in that I was reading an Philco "Television Home Study" guide/pamphlet last night that references that exact scope throughout. If you want the guide to go with the scope, let me know.

Mark
I did get a home guide with this scope (bug holes and all). Does yours look like the pictures in my first post ?

I've scanned the whole guide here.
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Last edited by bandersen; 11-17-2010 at 01:58 AM.
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Old 11-17-2010, 10:04 AM
mbear2k mbear2k is offline
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Quote:
Originally Posted by bandersen View Post
I did get a home guide with this scope (bug holes and all). Does yours look like the pictures in my first post ?
Mine is a Home Guide for troubleshooting TV issues - and references (and shows a small pic) your scope. I will scan and post!
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  #12  
Old 11-18-2010, 12:07 AM
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That would be great - thanks!
I'm make slow, but steady progress. I've never seen so many bad resistors. Seems the lower the value, the further out of spec they are

I dug up a spare 3RP1A in case this CRT is bad or weak.
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