Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on October 01, 2022, 03:42:20 am

Title: VK200 + cap filter on heaters ... is this interesting for guitar amps ?
Post by: kagliostro on October 01, 2022, 03:42:20 am

I recovered some components from an old Stereo Graetz radio and dismanting it I notiched the presence of some VK200 impedances, so I give a look to the schematic and I've seen that those components are used in the filament feeding path (in junction with 2.2n caps)

Will this filter be interesting to be used in guitar amps ?

(https://i.imgur.com/WpJd1qB.jpg)

(https://i.imgur.com/HgLHPBD.jpg)

Many Thanks

Franco

Title: Re: VK200 + cap filter on heaters ... is this interesting for guitar amps ?
Post by: PRR on October 01, 2022, 05:35:24 pm

ECC85 is probably a RF Amplifier. ECH81 is a converter (oscillator+mixer)? EBF89 is a "final IF amplifier and detector" (http://www.r-type.org/exhib/aaa0257.htm). This is probably a HIGH gain radio with possible MHz oscillations, even carried on common heater lines.

I don't see much use in guitar work.

Title: Re: VK200 + cap filter on heaters ... is this interesting for guitar amps ?
Post by: kagliostro on October 02, 2022, 05:11:00 am

Many Thanks PRR

Franco