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Replacement of 5Z4P tube

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Posted on June 3, 2012 at 10:38:37
Tubers


 
I recently took the delivery of a cheap Chinese SE amplifier. It has two 6L6G tubes, two 6N8P tubes (which I subsequently replaced with 6SN7WGT tubes) and one 5Z4P rectifier.

I believe it would be unreasonable to pay $350-$400 for a pair of RCA 6L6GC tubes when the amplifier costs $300.0 incl. shipment, but is there any reason in replacing the 5Z4P tube with its vintage equivalent? Does it influence the sound?

 

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RE: Replacement of 5Z4P tube, posted on June 3, 2012 at 11:11:27
Eli Duttman
Audiophile

Posts: 9414
Location: Monroe Township, NJ
Joined: March 31, 2000
The 6L6s are the easy part. Get some Russian 6П3С-E (6p3s-e3) stock from a reliable vendor, like AA sponsor Jim McShane.

The rectifier is indirectly heated, but seems to resemble the 5Y3. U.S. made types of that character are the 6087/5Y3WGTB and the 6106.

Eli D.

 

RE: Replacement of 5Z4P tube, posted on June 3, 2012 at 11:58:44
Tubers


 
Other sources suggest that GZ30 is the closest analog.

 

RE: Replacement of 5Z4P tube, posted on June 3, 2012 at 15:44:42
Eli Duttman
Audiophile

Posts: 9414
Location: Monroe Township, NJ
Joined: March 31, 2000
IIRC, a GZ30 is mighty close to the U.S. 5Z4. Mullard made GZ30s will carry hefty price tags.

Be very careful with Chinese types. For instance, the 5Z3P is a 5U4 "equivalent", with an Octal base. A U.S. made 5Z3 is electrically equivalent to the 5U4G, BUT the base is (sic) UX4.

Eli D.

 

RE: Replacement of 5Z4P tube, posted on June 5, 2014 at 10:44:06
pc123v
Audiophile

Posts: 212
Joined: February 6, 2014
Hi Eli,

Is there a difference between the Shuguang 5Z4P and 5Z4PA? Got Sovteks 5AR4 to replace the Shuguangs 5Z4PA (I am using 2 5Z4PA in each monoblock)but am going back to the Shuguangs as I don't really care for the Sovteks.

Of the 4 5Z4PA that I have...one has gone bad. Am wondering now if i can replace the 5Z4PA that has gone bad with a 5Z4P.

Thank you in advance for any advice you can give.



 

RE: Replacement of 5Z4P tube, posted on March 7, 2017 at 10:30:24
tubegopher
Audiophile

Posts: 3
Location: Pacific Northwest
Joined: February 4, 2011
Hi Tubers,
I just recently purchased a cheap Chinese amp kit that sounds like what you have. It has two 6p3p (6L6) two 6N8P (6SN7) and a 5Z4P. I only bought it as something to do since I am retired and I have run out of tube projects to work on. I have not yet received it, so I am wondering how your amp turned out and if you have any lessons learned that I could use.
What rectifier tube did you end up using? Also, what tubes are you using now?
I would appreciate anything you have in terms of info.
Thanks,
Don

Tubes are best!

 

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