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5Z4 half-wave rectifiers replacement suggestion

I have Hyperion HT 88 power amps and one of the rectifiers started to have blue sparks inside when I turn on the amp. I have a feeling it started to go hence the question.

What can I buy as a replacement for 5Z4 half-wave rectifiers ? There seems to be number of options but all of them have some additional letters after 5Z4 ... which is very confusing.

Can anyone explain what are the options as far as the replacement goes ?

Thanks,
Shorkun
shorkun
hifigeek1
770 posts
 
I believe the 5Z4 is a full wave rectifier and you can use a 5Z4GT if you wish. Usually the letters at the end indicate updated version, rugged version, glass envelope size and/or metal can vs. glass.
mechans
2,999 posts
 
Ask on Aujdio Asylum's Tube Asylum you might get more answers. I also think it is a full rectifier but I don't use rectifiers so I am not sure.
almarg's avatar
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almarg
8,673 posts
 
Yes, the 5Z4 is a full wave rectifier.

According to an older Sams Tube Substitution Handbook I have, the following can be substituted for it:

5Z4G, 5Z4GT, 5Z4GT/G, 5Z4MG, 5AR4, 5CG4, 5V4G, 5V4GA, 5V4GY.

Regards,
-- Al
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