• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Has anyone tried Metglass C-Cores in Audio Transformers ?

Jump to Latest
#87
yesterday I did change the choke from 2H small EI to 10H( large EI ) and figured out that the detailing in the entire spectrum was lost. It didn't have the charm that was there before the change. I have also changed the heater power supply from AC to DC ( non regulated just filters 10,000uF/16V ) for each heater. I think its because of the DC heater supply. If using an amorphous core would change the sound It will be nice.

I would be trying an amorphous choke. I'm expecting a better improvement with that.
 
#89
rhythmsandy said:
yesterday I did change the choke from 2H small EI to 10H( large EI ) and figured out that the detailing in the entire spectrum was lost.
Click to expand...


I have had similar observations and always try to get away with as few Henry as possible. The C-core chokes often have the option of parallel or series connection and the parallel always sounds better to me.

When experimenting with amorhous chokes keep in mind a substantially larger core is required for the same current rating vs steel laminations. Choke input connections also become more problematic. Unfortunately, when Lundahl introduced amorhous core chokes they did not increase the cross section.
 
#90
gorgon53 said:
Will give you a "garbage in - garbage out" transformer, not exactly what I would call a isolation transformer
Click to expand...

sadly this is true....

isolation in these cases is meant "galvanic" isolation, induction coupling like any other coupling does not discriminate.....

i have done other isolation traffos wherein i used electrostatic shielding between primary and secondary, between core and primary, etc...

a better way all around...
 
#91
analog_sa said:
I have had similar observations and always try to get away with as few Henry as possible. The C-core chokes often have the option of parallel or series connection and the parallel always sounds better to me.

When experimenting with amorhous chokes keep in mind a substantially larger core is required for the same current rating vs steel laminations. Choke input connections also become more problematic. Unfortunately, when Lundahl introduced amorhous core chokes they did not increase the cross section.
Click to expand...
I think thats what some of the users of Lars amplifiers have expressed that the bass is not having weight. Probably Lundhal could have used larger cores. For low frequency weight yes we need bigger cores.
 
You must log in or register to reply here.
Top Bottom