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Best Mullard 5AR4/GZ34?

I'm looking at replacing the rectifier tube in my Modwright LS100 having already replaced the stock 6SN7's with Sophia Electrics. Is there a meaningful sonic difference between the various Mullard rectifier tubes? Should I be looking at NOS or newly manufactured issues? If NOS, which version (and how will I know I'm getting the "right" one) and what should I expect to pay? If new, which of these are the best sounding and most reliable? Advice on where to purchase or even offers from sellers are welcome. Your expertise is much appreciated.
128x128dodgealum
rtn1
535 posts
 
Metal bases, fat bases, brown bases, double getters, Bugle Boy, fake tubes.... It's enough to make your head spin.

In any event, seems that Mullard/Blackburn vintage late 50s to early 60s are the ones to get.
lacee
811 posts
 
If the tube bears the RCA label,or any of the others mentioned, how does one identify it as a Mullard/Blackburn?

I have a few of the old RCA rectifier tubes from that era, and as old as they are, they sound much better in my SET amp than the one that it came with.

An Old Sylvania from the same era is also no slouch.
rodman99999
6,164 posts
 
Mr L- Recognition of the variously branded Mullard tubes, comes mainly with familiarity of their internal construction and date codes. Here's some info on the coding: ( http://www.audiotubes.com/mullcode.htm )
lacee
811 posts
 
Thanks for sharing Rodman99999.
rodman99999
6,164 posts
 
No Problem! Enjoy the music.
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