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biassetting
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Anyone have the coil data for this Gd-1A??
biassetting   3/25/2014 2:36:35 AM
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I have been looking for any coil data that I could build replacement coils from. If anyone has the coil data and and a suitible diode replacement for the rectifier I most certain lt would appreciate the help.  Thanks

grover_gren
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Re: Grid dip Meter
grover_gren   12/10/2013 9:17:47 AM
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thanks for that comment mhrackin. D'Arsonval was an interesting chap, and what a time to work in science (1851 - 1940)

mhrackin
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Re: Grid dip Meter
mhrackin   12/9/2013 3:26:00 PM
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Believe it or not, back in the '50s the "electrician's knot" was the CODE REQUIREMENT for power cord strain relief! Usually used with a rubber (natural of course) grommet that prvided a cushion between the CLOTH insulation and the nasty sharp edges of the hole in the sheet metal.  While on the topic of ancient history, the moving-coil meter movement had a name (eponymous with the inventor): D'Arsonval.  I still have quite a few Bakelite "terminal strips" for the RIGHT way to do the point-to-point wiring; flying connections were amateurish (no slur on hams, BTW; I've been licensed since 1957, ARRL Life Member).  Also ground lugs, along with some military-grade insulated standoffs for the same purpose as the strips (but single-point with a turret top compared to the multi-point terminal strips).  Despite the relative fragility of the vacuum tubes, the rest of the typical constructions of that era were pretty rugged, as they had to be with several hundred volts and high currents everywhere.

grover_gren
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Re: Grid dip Meter
grover_gren   12/2/2013 10:00:39 AM
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Well done mister C you have found another monster! A truly scary-looking lump of hardware that deserves to be torn down and buried in ten different places. It looks like something reclaimed from the chamber at Abu Ghraib. Did I spot a half-hitch tied in the mains cable to provide strain relief? Nasty nasty. KILL IT WITH THE BIG HAMMER!  

Jerrysc
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Grid dip Meter
Jerrysc   12/1/2013 11:17:48 AM
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Mine was a slightly later tube model. Looked the same except the meter bezel was transparent. Pulled it out after many years of storage and it was still in working order. Dont really have a use for it anymore so I sold it on eBay for $25.

David Ashton
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Blogger
Re: More on the Dip Meter...
David Ashton   12/1/2013 3:57:57 AM
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@Sanjib....if you want to be brave (and have fun) and make one yourself there is what looks like a very nice design here

http://sm0vpo.com/use/gdo.htm

80 KHz to 460 MHz - covers a good range.  I have not yet built one but it is on my to-do list....

Sanjib.A
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CEO
Re: More on the Dip Meter...
Sanjib.A   12/1/2013 12:15:45 AM
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Okay...thanks a lot!

xwindowsjunkie
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Wait a minute!
xwindowsjunkie   11/30/2013 3:23:30 PM
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I'm still using mine. It's not an antique, because if it is then I'm...........


Yes I built mine. It was the second Heathkit I built. It still has the original 6AF4 in it but the selenium rectifier has been replaced with a silicon diode and the power filter cap as well. 

I remember seeing a few articles way back then that had conversions detailed to put JFETs in place of the triode. One even went so far as to replace the power transformer with a basic 12.6/6.3 filament transformer so you could eliminate the high voltage (at least on the secondary side).

w2aew
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Rookie
Re: More on the Dip Meter...
w2aew   11/30/2013 2:22:48 PM
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There are probably not many being made these days. But MFJ Enterprises is still selling one http://www.mfjenterprises.com/Product.php?productid=MFJ-201

Jonathan Allen
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Manager
Grid dip meter
Jonathan Allen   11/30/2013 1:26:18 PM
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For anyone who wantsa to learn more about the grid dip meter, let me recommend a book:  "Servicing with Dip Meters" by John D. Lenk.  Howard W. Sams Co, 1968.


The Radio Amateur's Handbook also discusses this versatile instrument. 

 

 

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