voltage doublers do not have very good regulation and they generate more ripple,  that is why you have the two choke filter circuit,

it would seem that you want good regulation for a compressor circuit, witness the stiff supply in the Fairchild 670,

so you would be upgrading the Collins with a full wave of bridge circuit,

a lot of TV sets in the old days used doublers, i do not know why, obviously money would be my first guess, i bet you can use a cheaper transformer, half the secondary turns required, which means you can use bigger wire and keep heat down,  there is a ton of math on doublers in RDH4 relating cap size vs regulation vs voltage vs peak rectifier/avg rectifier current and all sorts of gobbly goop that is only understood by Ham radio geeks and what not, 

you know what, i  think you are genius....

This method is tried and true.  Take a look at the Gyraf G9 power supply: it uses both methods.

If it's a beefy heater transformer that you have, then it'd be OK to use another small heater transformer in reverse from that existing heater transformer's 9 -12v.  This is assuming this extra transformer can have its, what was, primary strapped for EU 240v AC.

you know what, i  think you are genius....



 

I ... can't believe Nachos have a creator. It seems like the sort of thing that would be created anonymously centuries ago at 3 a.m. on a Sunday morning after a night of heavy drinking.

I thought a similar thing.

Hey,
I had a little bit of free time on my hands and dug a little deeper. So I found that a manufacturer called Byron Audio sells these types of microphones at very reasonable rates. They want 47$ for a pair of these mics ( MOQ 100) including two mic clips, windscreens and a wooden/aluminium box. They also sell these capsules for 7.70$ (MOQ 200). I don't know if they are affiliated with ISK or not but they seem to be identical.
Just FYI. 

Best
Jannis

Got a link to their site? There are a couple Byron Audios I'm finding through Google.