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I am forwarding the email from Alan Douglas with his measurements of the original 59LF coils, along with a picture he sent.
I also attached the final configuration of my coils. My main coil values came out very close to Alan's measurements, but I ended up putting the coils together, with the trim caps before measuring the final values of all the coils.
Thanks for sharing the excellent photos. If you could provide a table of the inductance values, I think that the photos plus the values might make a nice addition to the 59LF collection.
> To: Joe Sousa
> From: Alan Douglas
> Subject: Re: 59LF Megacycle Meter
> Photo enclosed. This is as far as I can open the coil forms without
> unsoldering the wires. Coils are universal-wound on ferrite slugs 7/8"
> diameter, maybe an inch long. They're held on with wax and I can't count turns. Inductances (1 kHz) as follows, in microHenries:
> pins 1-2 pins 3-4 pins 3-5
> A: 59, 5000, 22.
> B: 5.5, 900, 2.2
> C: 2.8, 200, 11.6
> D: 1.9, 27, *
> * = can't read because of 1k resistor in series.
> I presume you have the schematic, but pin 3 is the cold end of the coil,
> hot end to pin 4, tap to pin 5. Feedback winding is 1 and 2.
> A .1-.25MHz, B .25-.55, C .55-1.5, D 1.5-4.5.
> The basic coil forms are by Na-Ald (Alden), standard stuff in the 1930s
> and 40s.
A free repository of materials from
GAP/R, George A. Philbrick /Researches.
Operational Amplifier Pioneer.
file:///C|/Documents%20and%20Settings/Kenneth%20Grimm/Desktop/FOR%20BAMA/59LF-coil-construction/email.txt12/19/2008 10:19:50 PM
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