17-06-2022, 11:42 PM
Forget about the power. A transformer is an impedance changer AND a power converter.
You need to couple a high voltage to a low voltage, and low current to a higher current.
A line transformer does exactly this, and they are cheap as chips, almost all these days
being made in China.
Line_traffos.pdf (Size: 170.35 KB / Downloads: 8)
The pic is just to show the prices and the sizes available, and thats just ONE supplier.
These allow 5 tappings on the secondary, ordianrily used to set the volume at the speaker where
the transformer is fitted. BUT you can use it to select the best coupling to your circuit.
It WONT be perfect, but will allow you to select the best volume to the speaker,
AND the best current to suit your valve. If you go this way, I would start with the .33 watt tapping
on the smallest in my add.
1$Au = about 60p so all of 5 quid.
As I said, its a maybe solution but will work. DONT forget that SE amplifier output transformers
require an airgap so that they dont run into saturation ( which draws BIG current apart from other problems ).
This has already been taken care of in the design.
Hope thats an idea.
Joe
You need to couple a high voltage to a low voltage, and low current to a higher current.
A line transformer does exactly this, and they are cheap as chips, almost all these days
being made in China.
Line_traffos.pdf (Size: 170.35 KB / Downloads: 8)
The pic is just to show the prices and the sizes available, and thats just ONE supplier.
These allow 5 tappings on the secondary, ordianrily used to set the volume at the speaker where
the transformer is fitted. BUT you can use it to select the best coupling to your circuit.
It WONT be perfect, but will allow you to select the best volume to the speaker,
AND the best current to suit your valve. If you go this way, I would start with the .33 watt tapping
on the smallest in my add.
1$Au = about 60p so all of 5 quid.
As I said, its a maybe solution but will work. DONT forget that SE amplifier output transformers
require an airgap so that they dont run into saturation ( which draws BIG current apart from other problems ).
This has already been taken care of in the design.
Hope thats an idea.
Joe
