Tube multiplex adapter parts replacement

[DragonMaster]

I've just got an old EICO HFT90 mono FM tuner, so I want to build the EICO MX99 multiplex adapter since I've been able to find the building instruction manual on the internet that shows you how to build it. The problem is that since I don't have the kit with all the parts, but only a free PDF, there are some parts that turned obsolete with time(Or I don't know what they are).

Here they are: (From the manual)
Coil, filter, 19kc
Coil, doubler, 19kc
Coil, oscillator, 38kc
Coil, trap, 67kc

 

[moamps]

Here they are: (From the manual)
Coil, filter, 19kc
Coil, doubler, 19kc
Coil, oscillator, 38kc
Coil, trap, 67kc [/B]

They are coils (L= 30 to 100mH) in tuned LC filters on 19, 38 and 67kHz. You can find more info here: http://www.turneraudio.com.au/htmlwebpgs02/schemampxdecoder.htm

Regards,
Milan

 

[DragonMaster]

And in the manual ( http://www.mcmlv.org/Archive/HiFi/EicoMX99.pdf ) it tels it's adjustable.

How do I build these?
In the Eico one, I see two coils in parallel with an arrow in the middle, with (sometimes) caps and a fixed point on one of the coils.

Sorry, I might not understand until I see pics of a DIY one(because I think a real one is a big metal box) and exact instructions/values.


BTW, someone know where I can get a 33mm / 1.5" shaft pot?