Service Manuals, User Guides, Schematic Diagrams or docs for : Boonton 59LFcoils

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 Hi Ken,
 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.

 Hi Joe,

 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.

 Thanks again,

 > To: Joe Sousa 
 > From: Alan Douglas 
 > Subject: Re: 59LF Megacycle Meter
 > X-Rcpt-To: 
 > Hi,
 > 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.
 > Alan
 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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