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11-07-2022, 07:51 PM
Hi Daryl
What you wrote here says you did not understand the description of the output transformer:
" If I can provide a reflected impedance load that the supply side wants to "See", why would a higher quality piece of copper and Iron give you less performance?"
The first part of the assumption is incorrect inasmuch as the OT has a centre-tap to feed power to the tube plates and your line ATs do not. You cannot use what is essentially a single-ended transformer designed for zero standing-DC as a replacement for a real push-pull transformer.
The second part of your statement has nothing to do with anything I stated. Guitar amps are not about fidelity per se; rather, they are about tone creation. For some players fidelity is improved tone, where others find such a change contrary to what they want. There is no right and wrong there.
Computers and guitar amps both have resistors and capacitors but they are wildly different devices. The same goes for line transformers and tube output transformers - apples and oranges. TUT volumes 2,4,5,6 have explanations about how output transformers function and how to specify them.
In a push-pull circuit, each tube only amplifies half the signal, working on its own end of the OT primary with CT tied to B+. The signal is "added together" within the OT. While one tube works the other rests but both ends of the transformer are magnetically in parallel so thew working tube does not see half the end-to-end impedance but one-quarter. The secondary is designed to match the speaker. OTs come in all power ranges and with narrow or wide frequency response. B+ can be hundreds of volts and the end-to-end voltage approaches twice the B+ value. OTs are designed for this environment.
On the other hand, line distribution transformers like you have are designed to match an amplifier speaker output to a 70V line, or to match the 70V line to a speaker load. Neither side can tolerate DC current or voltage. To reflect an impedance of k-ohms would require a very nonstandard speaker and everything else about the transformer is truly inadequate for the goal of replacing a real tube amp output transformer. As far as that application goes, your ATs are the wrong device. Why not use them to distribute sound through your house? The point of the high-voltage distribution is to allow the use of thin and inexpensive wire.
Have fun
What you wrote here says you did not understand the description of the output transformer:
" If I can provide a reflected impedance load that the supply side wants to "See", why would a higher quality piece of copper and Iron give you less performance?"
The first part of the assumption is incorrect inasmuch as the OT has a centre-tap to feed power to the tube plates and your line ATs do not. You cannot use what is essentially a single-ended transformer designed for zero standing-DC as a replacement for a real push-pull transformer.
The second part of your statement has nothing to do with anything I stated. Guitar amps are not about fidelity per se; rather, they are about tone creation. For some players fidelity is improved tone, where others find such a change contrary to what they want. There is no right and wrong there.
Computers and guitar amps both have resistors and capacitors but they are wildly different devices. The same goes for line transformers and tube output transformers - apples and oranges. TUT volumes 2,4,5,6 have explanations about how output transformers function and how to specify them.
In a push-pull circuit, each tube only amplifies half the signal, working on its own end of the OT primary with CT tied to B+. The signal is "added together" within the OT. While one tube works the other rests but both ends of the transformer are magnetically in parallel so thew working tube does not see half the end-to-end impedance but one-quarter. The secondary is designed to match the speaker. OTs come in all power ranges and with narrow or wide frequency response. B+ can be hundreds of volts and the end-to-end voltage approaches twice the B+ value. OTs are designed for this environment.
On the other hand, line distribution transformers like you have are designed to match an amplifier speaker output to a 70V line, or to match the 70V line to a speaker load. Neither side can tolerate DC current or voltage. To reflect an impedance of k-ohms would require a very nonstandard speaker and everything else about the transformer is truly inadequate for the goal of replacing a real tube amp output transformer. As far as that application goes, your ATs are the wrong device. Why not use them to distribute sound through your house? The point of the high-voltage distribution is to allow the use of thin and inexpensive wire.
Have fun
