Tom, here are the questions that I would ask myself (and some answers) were I to consider building this thing:
Q1) Does my scope have a sweep output terminal? Not all scopes do. If my scope has no sweep output then I have two possibilities:
A1) This design is useless to me so I will go find another circuit that doesn't need a sawtooth input from the scope (they do exist).
A2) Research sawtooth oscillators and possibly build one into the unit. This can use a simple 555 IC or a unijunction transistor circuit. The sawtooth oscillator would then feed the sweep oscillator / wobbulator (we generally call them sweep oscillators here in the US). In addition, a sawtooth output would feed the horizontal input of the oscilloscope. (It gets a little more complicated if I add a blanking circuit, but if the sawtooth wave is clean then the retrace will be faint enough to not mess up the display, and I won't need a blanking circuit)
Q2) Do I really want to attempt to build a design that uses several un-obtainable parts?
A1)No -- I will look for another design that uses commonly availabe parts.
A2)Yes -- Perusing BDSM porno sites has made me a glutton for punishment so I will do the research / math necessary to reverse-engineer the design and search through parts catalogues to find parts with the necessary ratings. The basic specifications for the varactor diode are given in the article and can also be googled. When you know the minimum and maximum capacitance of the varacter you will use, you can use basic handbook/textbook formulas for resonance to determine the inductance needed for each coil based on its upper and lower useful frequencies. Then back to Digikey-Mouser-Whoever catalogs to search and search and search.
Q3) Will I find coils with the proper inductance value that are compatable with the PC layout?
Q4) Do I want to redesign the PC board?
Q5) Shouldn't these ropes be a little tighter?
Actually Tom, it is doable -- it will just take some effort to figure it out. Otherwise, if you are mostly interested in antique radio with 455 IF's then take a look at Alan Yates simple little unit -- AND it includes its own sawtooth generator:http://www.vk2zay.net/article/93
I put some stuff that might be of interest here but just for a while: ftp://ftp.sonic.net/pub/users/amckenna/temp/sweepgen/
. Another very simple unit here: http://vintageradio.me.uk/radconnav/misc.circuits/
(sixth entry down)
Good Luck, Al