Post by Claude V. LucasSame as it always is and will always be
Unfortunately, this ng is biased toward mentally ill behavior from
angry, frustrated losers GP. There's a 'whole picture' here.
I was incorrect and I apologize- I was thinking SS vs. GZ34. In THAT
case, the GZ34 produces more sag.
_All_things_being_equal_ you'd get less headroom (earlier breakup),
more sag/slower rise times (compression), looser bass, and less
voltage w/ a 5Y3 and more headroom, faster response, tighter bass, and
more voltage with a GZ34.
*HOWEVER!* The issue is really power level of your amp...look here;
http://www.valvette.us/tube_types.html
The nice thing about tube rectifiers is that there *are* several
types....5AR4(=GZ34), 5V4, 5R4, 5Y3..which will progressivley lower
the voltage and increase sag and reduce clean headroom. so there's a
'palette' to choose from. 'Sag' is really the same thing as
'compression'...it means the front edge of the note will be reduced in
relation to the trailing edge..less aggressive 'attack'.
Power supplies dump their energy when you strike a note/cord,
therecovery time can be fast, or slow depending on the design of the
entire circuit. With slower recovery times, you get a natural
compression when the tubes are conducting hard, and musical notes will
hold longer. The supply voltage drops when the note is played, as the
note starts to decay, the supply voltage is recovering raising the
gain back up. This is where you get compression.
However, slow recovery power supplies can cause a muddy sound,
especially in lower voltage supplies, and cathode biased output
stages. When the supply recovers fast, the attack is increased, and
lower frequencies will be tigther/bolder. If the power supply is too
stiff/fast, notes will decay quicker, and the "touch/feel/sensitivity"
thing will be lifeless.
Regards,
mvm
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