I am building a tube mic preamp with a 12au7 SRPP output. I am planning to use a 1:1 turn ratio line out transformer. I feel that I should get one with 10K:10K impedence ratio, but will a 600:600 also OK for this application?
How is the impedence of a transformer determined? Thought it is determined by the actual load impedence, right?
How is the impedence of a transformer determined? Thought it is determined by the actual load impedence, right?
pftrvlr said:I am building a tube mic preamp with a 12au7 SRPP output. I am planning to use a 1:1 turn ratio line out transformer.
Why? I am all in favor of transformers, but this is one place that it doesn't make much sense.
Re: Re: Line output transformer question
Why not? Gyraf mic preamp uses a 2:1 transformer in the output.
dsavitsk said:
Why? I am all in favor of transformers, but this is one place that it doesn't make much sense.
Why not? Gyraf mic preamp uses a 2:1 transformer in the output.
pftrvlr said:
How is the impedence of a transformer determined?
By the primary inductance.
What is this transformer going to actually do?
Re: Re: Re: Line output transformer question
A 2:1 gets you better current drive, lower Zout, and less gain. A 1:1 gets you an expensive part and higher distortion for your trouble.
pftrvlr said:Why not? Gyraf mic preamp uses a 2:1 transformer in the output.
A 2:1 gets you better current drive, lower Zout, and less gain. A 1:1 gets you an expensive part and higher distortion for your trouble.
pftrvlr said:I am building a tube mic preamp with a 12au7 SRPP output. I am planning to use a 1:1 turn ratio line out transformer. I feel that I should get one with 10K:10K impedance ratio, but will a 600:600 also OK for this application?
How is the impedance of a transformer determined? Thought it is determined by the actual load impedance, right?
they are not the same, the 10k line traffo will handle substantialy more voltage than a 600 ohm one...ohm's law is right at work here..
while the two will have the same turns ratio, the 10k one will have about 4 more turns than the one turn of the 600ohm ones...
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