GEC Selectest Meter Super 50 MKIII - UK Vintage Radio Repair and Restoration Discussion Forum

its ur aerial · 1st Feb 2019, 8:31 am

Does any one know, what batteries the GEC Selectest Meters used, do they require a high voltage type like the big AVO`s ?

Dickie · 1st Feb 2019, 9:11 am

Yes they do - The same B121 as used in the AVO 8.

its ur aerial · 1st Feb 2019, 10:02 am

Thanks for the reply, appreciated.

turretslug · 1st Feb 2019, 10:26 am

These are good meters, broadly comparable with the AVO 8, but never achieved the ubiquity. I'm almost tempted to start a Selectest survey thread!

One difference is that the Selectest 50 needs both 15V and 1.5V batteries to be present for the x100 ohms range to work, they're used in series for 16.5V nominal- presumably this simplifies the switching. The AVO 8 just needs the15V battery for thisrange to work.

avocollector · 2nd Feb 2019, 5:00 pm

Quote:

Originally Posted by turretslug

These are good meters, broadly comparable with the AVO 8, but never achieved the ubiquity. I'm almost tempted to start a Selectest survey thread!. . . .

Let us know if you do decide to start a thread - I have about 6 of these meters and one of the things that intrigues me is that some have a red surround on the meter zeroing adjustment screw and some have a black. Just what components they had at the time or marking significant variations?? Also I've never yet managed to find a schematic/circuit diagram for them - must have existed surely??

chriswood1900 · 2nd Feb 2019, 9:13 pm

For a diagram have a look at post 6 in this thread https://www.vintage-radio.net/forum/...d.php?t=136727

Chris

avocollector · 6th Feb 2019, 3:43 pm

Brilliant - many thanks Chris

1st Feb 2019, 8:31 am	#1
its ur aerial Hexode Join Date: May 2009 Location: Ryde, Isle of Wight, UK. Posts: 419	GEC Selectest Meter Super 50 MKIII Does any one know, what batteries the GEC Selectest Meters used, do they require a high voltage type like the big AVO`s ? __________________ Life is not Hollywood, life is Cricklewood.

1st Feb 2019, 9:11 am	#2
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: GEC Selectest Meter Super 50 MKIII Yes they do - The same B121 as used in the AVO 8. __________________ Regards, Richard, BVWS member

1st Feb 2019, 10:02 am	#3
its ur aerial Hexode Join Date: May 2009 Location: Ryde, Isle of Wight, UK. Posts: 419	Re: GEC Selectest Meter Super 50 MKIII Thanks for the reply, appreciated. __________________ Life is not Hollywood, life is Cricklewood.

1st Feb 2019, 10:26 am	#4
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,396	Re: GEC Selectest Meter Super 50 MKIII These are good meters, broadly comparable with the AVO 8, but never achieved the ubiquity. I'm almost tempted to start a Selectest survey thread! One difference is that the Selectest 50 needs both 15V and 1.5V batteries to be present for the x100 ohms range to work, they're used in series for 16.5V nominal- presumably this simplifies the switching. The AVO 8 just needs the15V battery for thisrange to work.

2nd Feb 2019, 9:13 pm	#6
chriswood1900 Octode Join Date: Jan 2007 Location: Dorridge, West Midlands, UK. Posts: 1,483	Re: GEC Selectest Meter Super 50 MKIII For a diagram have a look at post 6 in this thread https://www.vintage-radio.net/forum/...d.php?t=136727 Chris

6th Feb 2019, 3:43 pm	#7
avocollector Heptode Join Date: Jul 2010 Location: Wellington, New Zealand. Posts: 653	Re: GEC Selectest Meter Super 50 MKIII Brilliant - many thanks Chris