[sdiy] Request brain dump on balanced lines

[Tony Allgood]

> if you had the output tubes exactly matched you would have more odd
harmonics and fewer even harmonics, yet we've never heard of folks
intentionally mismatching output tubes.

Some valve amp players do misbalance the tubes. I should think there is
quite a bit on this on the various tube sites. The later silverface
Fender's even give you a pot to do this, although this isn't the
intention of the pot of course. Worrying though if you are deliberately
pushing 80mA through one and 20mA though the other.

[On a side note, I just had a 1973 Carlsbro CT60 (Fender style copy)
with a steady 90mA through each of its EL34. No bias trim on these amps
but I took it down a wee bit anyway to 30mA!]

I have always bought my tubes matched and tend to leave any balancing
act to the tube suppliers. Bias I set globally on all the output tubes.
But what do I know... I play synths and like the sound of the DX-7
acoustic guitar patch :-)

Regards,

Tony Allgood                       Penrith, Cumbria, England

Oakley Sound Systems                     www.oakleysound.com
Modular projects            www.oakleysound.com/projects.htm