VacuumVoodoo
Well-known member
Hi guys,
does anybody have any info on this filter ? Datasheet, manual or schematic ?
As far as i could find out it's made in early 1960s but the company does not exist anymore.
Got it from a company trading used test instruments as replacement for a faulty multimeter i bought from them.
The unit is in very good condition and working.
Each filter section has 5 Telefunken ECC81/12AT7 and some other stuff in line output amps, see pictures.
What puzzles me is the big black tubular component, i gues it's some kind of multisection wirewound potentiometer. It's operated by the frequency tuning dial.
The thing is a dual filter, HP/LP cutoff frequency tunable 20Hz to 100kHz.
Any help will be greatly appreciated. Below are a few small pictures, you can see full size photos here:
http://www.fototime.com/inv/A2244A5765E01E0
Alex
does anybody have any info on this filter ? Datasheet, manual or schematic ?
As far as i could find out it's made in early 1960s but the company does not exist anymore.
Got it from a company trading used test instruments as replacement for a faulty multimeter i bought from them.
The unit is in very good condition and working.
Each filter section has 5 Telefunken ECC81/12AT7 and some other stuff in line output amps, see pictures.
What puzzles me is the big black tubular component, i gues it's some kind of multisection wirewound potentiometer. It's operated by the frequency tuning dial.
The thing is a dual filter, HP/LP cutoff frequency tunable 20Hz to 100kHz.
Any help will be greatly appreciated. Below are a few small pictures, you can see full size photos here:
http://www.fototime.com/inv/A2244A5765E01E0
Alex