For those of you that may have a Cary SLP 05 Pre. I just replaced the standard 5AR4 rectifier tube with a Philips Miniwatt GZ34 and WOW what a difference. Added quietness and a clarity.
I was tube rolling. Found a phillips miniwatt GZ34 in my stash. Put it in my Allnic phono stage. I could not believe the difference it made. Everything was bigger, deeper and wider. Very natural sounding with no harshness.
The GZ34 I bought was metal based and, as I understand, these are hard to find. Don't have any experience with the plastic based ones so could not advise on that issue.
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