[Test-Equipment] [GreenKeys] [OT] - First Tube EquipmentRestoration Project

[Gene]

One of the better ways to check out an old piece of equipment is to use a variac to slowly bring up the input voltage over a period of time
Also remember that the line voltage years ago was on the order of 110 volts.

73

Gene, WØQFC 

-----Original Message-----
From: test-equipment-bounces at mailman.qth.net [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Doug Hensley
Sent: Monday, June 10, 2019 11:03 AM
To: mwillega
Cc: boatanchors mailman.qth.net; test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] [GreenKeys] [OT] - First Tube EquipmentRestoration Project

Mike, glad to hear of your project.  This list is for teletype related interests.

I'm taking the liberty of forwarding your message to the TEST-EQUIPMENT and BOATANCHORS mailing lists where more active tube repair talk is done.  If you are not already subscribed, do so.  There is not much traffic.

The easiest start on testing your tubes is to remove them one at a time and with your VOM, check for continuity between their filament pins.  If all the filaments are good then in all likely hood they will not be an issue in firing your unit up to see if it works.  And, most probably, they will suffice until you can assess how the scope is working.

The next step is to check the electrolytic in the power supply section for shorts or excessive leakage.  And for recommendations to get going, just GOOGLE 🙂 ...





Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.  Looking for something special?  Ask us.
Wanted: Petersen Type PR-1 in FT-243 holder cut for 1770 kHZ (Used in IF Stage of a Mackay Receiver).






________________________________
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> on behalf of mwillega <mike at willegal.net>
Sent: Monday, June 10, 2019 9:16 AM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] [OT] - First Tube Equipment Restoration Project

Hi all,

I’m about to embark on my first restoration of a piece of tube based test gear.  It’s an old Heathkit Oscilloscope from the early 70s.  I am looking for recommendations for approaches to tube testing.  Do I seek out  or build a tube tester or just test in circuit.  Anything else that I should look out for, besides the usual concerns about high voltages on the chassis, and old degraded components.

Regards,
Mike Willegal


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