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eHam Forums => Boat Anchors => Topic started by: N4AST on May 10, 2019, 12:07:55 PM



Title: Drake TR4 Meter
Post by: N4AST on May 10, 2019, 12:07:55 PM
Hello,  A friend is restoring a TR4 (not a TR4-C).  The plate current/relative power meter has become "bouncy" to the point of being unusable.  Has anyone had any experience with this problem?  Assuming the meter cannot be repaired, does anyone have the specs on the meter so he can look for a sub?  The only thing he has is full scale indication=600ma, and the internal resistance is ~250 ohms.  He has yet to check the full scale current.  Thanks for any help.

Gary N4AST


Title: RE: Drake TR4 Meter
Post by: WA4JQS on May 10, 2019, 05:39:12 PM
tell your friend to check into the Drake Tech net every Sunday at 16:00 est 7.238. or go to WB4HFN website. also there are two Drake Facebook pages .73 Tony WA4JQS


Title: RE: Drake TR4 Meter
Post by: AK0B on May 10, 2019, 09:08:57 PM
One may be surprised but many meters can be repaired.   I use to work in a calibration laboratory and they had a watchmaker do meter repairs.

So is worth taking with your local watchmaker you might be surprised.

Stan ak0b


Title: RE: Drake TR4 Meter
Post by: WA5VGO on May 11, 2019, 07:01:31 AM
It’s a 1 mA movement.


Title: RE: Drake TR4 Meter
Post by: N4AST on May 12, 2019, 06:49:18 AM
Thanks everyone for the replies.  Much appreciated.

Gary N4AST


Title: RE: Drake TR4 Meter
Post by: KX4OM on May 13, 2019, 09:41:55 AM
Hi Gary,

You might check out W2AEW's YouTube video #235 on D'Arsonval meters. He has a simple shake test with the meter terminals open and shorted.

Ted, KX4OM


Title: RE: Drake TR4 Meter
Post by: N4AST on May 13, 2019, 11:41:17 AM
Yes, I saw that Ted.  Very informative video from W2AEW as usual.  Passed the shake test info on to my friend.  Thanks for the reply.

Gary