mantha3 wrote:I have 2 of the Big Bottle GZ37s and they are excellent. I have a GZ33 as well. These have become so scarce I look at tubes like this one we are talking about to run on a usual basis to preserve the Mullard reserve.
Right now I'm looking at a NOS GZ37 for $120 thinking that sounds reasonable, and kicking myself for not buying two at $90 each when I had the chance.
Bob Latino wrote:About the only time I can "hear" the difference between rectifiers is when a certain rectifier is pushed to the limit of its ability to provide a steady source of DC to the amp. This means only at real high volume levels. At lower volume levels I can't hear the difference between different rectifiers.
You just described my listening habits perfectly. I suppose I could try doing some comparisons at what most consider reasonable volume levels with efficient speakers and all that yada yada ... but nope ... not the real me ... I prefer to LET IT ALL HANG OUT!! I've also mentioned from time to time my dbx bass synth and range expander ... I do know that can increase the demands on an amp ... significantly. Turn that stuff off, and it's like something dead crawled into my ears.
Probably explains the difference I hear in rectifiers. The 5AR4 is borderline at best in my situation, and my impression of sterile sound with the solid state rectifiers may just be that I'm prejudiced against things that don't glow in the dark? I do know MY system has much more muchness using the big bottle GZ37. The WZ68 copper cap is strictly backup here.
And no ... sag is definitely NOT desirable in a stereo system. You're not looking for effects or distortion as you would with an instrument amp.