ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: Mook A pair of 6V6s in fixed bias want t... -- 8/13/1999 12:58 PM

Re: Choosing an OT: Theory Q's

8/13/1999 1:10 PM
R.G.	Re: Choosing an OT: Theory Q's Try it and see. Mismatching the nominal primary impedance of an OT is exactly the same as mismatching the secondary impedance with speakers. OT's have no "impedance" of their own, only a reflection ratio. You can cause the plates to see a 2:1 change at their plates by changing the speakers 2:1. Be aware that putting speakers in series with lower the damping factor and loosen bass all on its own, though, so you really should use single speakers of different nominal impedances. That makes it harder to hear tonal differences of just the OT change. Hmmm. Maybe the thing to do is to set up an amp with a quad of 6V6's and plug/unplug two of them, then readjust the volume level. That should have the same effect.

8/13/1999 1:10 PM

R.G.

Re: Choosing an OT: Theory Q's

Try it and see. Mismatching the nominal primary impedance of an OT is exactly the same as mismatching the secondary impedance with speakers. OT's have no "impedance" of their own, only a reflection ratio. You can cause the plates to see a 2:1 change at their plates by changing the speakers 2:1. Be aware that putting speakers in series with lower the damping factor and loosen bass all on its own, though, so you really should use single speakers of different nominal impedances. That makes it harder to hear tonal differences of just the OT change.

Hmmm. Maybe the thing to do is to set up an amp with a quad of 6V6's and plug/unplug two of them, then readjust the volume level. That should have the same effect.