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

Stratmanx
Contributing Member
**********
*******

Memphis, TN

Oct 9th, 2017 10:13 AM   Edit   Profile   Print Topic   Search Topic

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 ?


willie
Contributing Member
********

Too Near Atlanta GA

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

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

w

Stratmanx
Contributing Member
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Memphis, TN

Oct 9th, 2017 12:11 PM   Edit   Profile   Print Topic   Search Topic

Thanks Willie, I'll give it a shot.


Hammond101
Contributing Member
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So. Cal. USA

Oct 9th, 2017 12:16 PM   Edit   Profile   Print Topic   Search Topic

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

MLC

It's not just good..

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

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   Print Topic   Search Topic

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.

pdf64

UK

Nov 4th, 2017 05:02 AM   Edit   Profile   Print Topic   Search Topic

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).

GZ34

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

willie
Contributing Member
********

Too Near Atlanta GA

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

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.

w

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




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