Just saw this

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Just saw this

I'm a little unfamiliar with this, but I've heard nice sounding ones. Here goes, and please anyone correct my mistakes.

First of all a transformer designed to work with 10mA on the primary won't work well with only 1mA on the primary, so the manufacturer's spec on that is important. After the , 2*pi*L*F=Inductive reactance. Look at your driver tube's plate resistance. When the choke's inductive reactance is equal to the plate resistance, gain will be ~-3dB. More inductance = deeper bass. The turns ratio of the transformer will also reflect your driven load (next stage) onto the primary by the square of the ratio. This will be in parallel with the inductive reactance. The DCR of the primary is series added to the primary inductance.

I've probably butchered that all to he!!, but I figured I owed you something.

I have a set of Lundahl 1660s that I'll use as a plate to plate load for the output of a differential phono stage. Neat way to convert back to single ended and have no output coupling cap. Haven't built it yet, so I can't tell you if it sounds good. But I like it in theory.

Stuart
Smoke is on......here come the burners!

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Follow Ups Full Thread

Topic - Anyone built the Beta follower VALVE AMPLIFIERS, Page 126,Fig.2.44? - grhughes 09:30:40 09/15/10 (12)

RE: Anyone built the Beta follower VALVE AMPLIFIERS, Page 126,Fig.2.44? - Slick 20:24:15 09/15/10 (11)

High Beta = BC559C - Mark Kelly 22:26:32 09/17/10 (1)

Thanks Mark! Always good to hear from the wine maker down under! - grhughes 10:39:54 09/18/10 (0)

Thanks! What Cree Schottky diodes are you using? - grhughes 08:22:39 09/16/10 (8)

RE: Thanks! What Cree Schottky diodes are you using? - Slick 12:42:37 09/16/10 (7)

Thanks, Stuart! - grhughes 13:46:16 09/16/10 (6)

RE: Thanks, Stuart! - Slick 06:59:18 09/17/10 (5)

If I could buy the ideal transformer to use as a plate load what should I look for inductance wise? - grhughes 07:42:35 09/17/10 (2)

Just saw this - Slick 09/19/1019:54:54 09/19/10 (1)

Thanks: Trying to do this with minimum investment....... - grhughes 03:00:42 09/20/10 (0)

My worry is that the transformer can't stand much current in the primary winding.... - grhughes 07:35:38 09/17/10 (1)

By all means... - Slick 08:44:55 09/17/10 (0)

Follow Ups

Just saw this - Slick 09/19/1019:54:54 09/19/10 (1)

Thanks: Trying to do this with minimum investment....... - grhughes 03:00:42 09/20/10 (0)

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