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FDP Forum / Amp Mods, Repairs, and Projects / Recomendation for current production GZ34 rectiier tube ?

Contributing Member

Memphis, TN

Oct 9th, 2017 10:13 AM   Edit   Profile  

more than likely going to replace the Sovtek GZ 34 I've got on hand and wanted to know what you guys are using for current production GZ34 rectifiers ?

I love the NOS stuff, but prices on these are pretty high.

Thoughts ?

Contributing Member

Too Near Atlanta GA

Amp Tech Emeritus
Oct 9th, 2017 11:08 AM   Edit   Profile  

I've long used JJ 5AR4/GZ34 with good results.


Contributing Member

Memphis, TN

Oct 9th, 2017 12:11 PM   Edit   Profile  

Thanks Willie, I'll give it a shot.

Contributing Member

So. Cal. USA

Oct 9th, 2017 12:16 PM   Edit   Profile  

I also prefer the JJ over the Russian or Chinese rectifier tubes.


It's not just good..

...it's good enough.
Oct 10th, 2017 06:39 AM   Edit   Profile  

I put the equivalent Weber Coppper Cap rectifier in my Deluxe Reverb several years ago.

It's a solid state device, but they were designed to mimic a tube rectifier. It's NOT a straight-up SS rectifier plugin.
Basically, a "tube" rectifier that won't wear out.

I've been very happy with mine.

Copper Cap Rectifier

Steve Dallman

Merrill, Wisconsin

Age is just a number...mine is big
Nov 3rd, 2017 01:30 PM   Edit   Profile  

I too like the copper caps. They use a SS rectifier and voltage dropping power resistors, in series with a heat sensitive thermistor.

When you power up the amp, the thermistor is at a high resistance. As the resistors heat up, the resistance of the thermistor drops, until full voltage is reached.

The resistors chosen drop the voltage to match their tube counterparts.

My ONLY complaint is that the CC is rather heavy and falls out often in transport. I have added tube holders to the rectifier socket to prevent this.



Nov 4th, 2017 05:02 AM   Edit   Profile  

Ruby tubes have a good warranty and are stringently screened.
A well respected real engineer has worked to get their GZ34 as close as possible to the Mullard characteristics, see link.

The Weber WZ34, with its 78 ohm series resistance, is far saggier than any real GZ34, and so hamstrings an amps power output (which may be a good thing if that's what you're after).


(This message was last edited by pdf64 at 07:02 AM, Nov 4th, 2017)

Contributing Member

Too Near Atlanta GA

Amp Tech Emeritus
Nov 4th, 2017 06:15 AM   Edit   Profile  

I like the concept of the copper cap but not the practicality of it for the same down side that Steve mentioned (too heavy). I used to build my own version of the copper cap years ago...they have their applications but I still prefer a well designed and appropriately applied vacuum tube rectifier in most cases.




Bobby Roadrunner
Jan 2nd, 2018 06:01 AM   Edit   Profile  

I did a quick experiment using my 1967 Super Reverb. I compared my no’s Millard, the JJ, the TAD and a preferred series GZ34/5AR4 and there was virtually no difference. I presently left the TAD in there since the 6L6GC were TAD also just to have matching tubes showing.

Mars Hall

USA NW Indiana

Jan 3rd, 2018 12:36 PM   Edit   Profile  

pdf64, the only Ruby rectifiers I see are labeled 5AR4 from the Magic Parts site and others. The guy in your reference article claims the 5AR4's have more voltage drop than a GZ34. The posts are from 2011. Perhaps Ruby doesn't produce the GZ34 any more?



Jan 4th, 2018 11:39 AM   Edit   Profile  

Thanks for pointing that out.
I suspect (from the blurb and the 'C' designation) that they may be selling it now as the 5AR4C/GZ34 see link.

I guess they might have labelled it like that to avoid confusion, as the two tube types are compatible / equivalent.

It definitely isn't their 5AR4CZ which is branded JJ.

External link

(This message was last edited by pdf64 at 09:08 AM, Jan 6th, 2018)

FDP Forum / Amp Mods, Repairs, and Projects / Recomendation for current production GZ34 rectiier tube ?

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