Hi guys,
I am testing a homemade tube rectification circuit.
At the moment I have 2 items bought as a winner being a Parmeko Choke 5H and a U52 Mullard tube (bloody expensive)
As a first cap..I have on a test the Obbligato, ASC, General Electric 10 uF.
My sec cap is a 100 uF Blackgate.
now my question...has anybody ever tried film as a first cap.....I am thinking of a claritycap MR
a bit expensive for a tryout..but it is tempting....
Hi Eric,
Obbligato and ASC are actually film caps, being metalized polypropylene but oil filled.
You can really use any config you want to, as an example this Scott Thompson DAC, owned by S Meyerkort came in for
repair and went out with a tube rectifier stage added.
The config is rectifier > C > L > C > L(Rch) + L(Lch) > C(R ch) + C(L ch).
So that is in effect a CLC filter then split in to individual R/L channel LC's.
The first 2 C's are motor start caps but the last cap was a high uF value electrolytic.
The 1st cap will have a strong effect on the voltage OP, so if this cap is small value the filter
starts to look more like a choke input filter and the OP voltage will start dropping.
Of equal importance to what type of caps you are using is how you actually wire the thing
WRT grounding etc.
T