WZ34 vs. WZ68 Weber Copper Cap

What's the difference between a WZ34 and WZ68 when used in an ST70?

Both are $22. the WZ68 can handle 450ma while the WZ34 can handle 225ma.

Is the WZ68 simply the same pinout and rectifier, but rated for higher current?

If so, then why would one buy a WZ34 when you could just buy a WZ68 and put it in the ST70?

Jason

Hi all:
I just re-built my Weber copper cap after it blew up. They are bonehead simple inside. The parts are all easy to find and consist of: 2 10 watt 20K wound resistors, 4-4007 diodes , 1 NTC 100D-11 thermistor for the delay. They are all on a little pc board that makes easy to do the replacement.
I replaced all the parts for less than $10 and it works fine. I had to do it myself because it takes weeks to get stuff down to Costa Rica. I found the parts here so I tried it and it works perfectly.
If you ever blow one make sure you change the thermistor its all the delay you will have and those thing flow a bunch so it is your insurance.

I emailed Weber the same question, we'll see.

Here's my question and Weber's response:

> comments: What's the difference between a WZ34 and WZ68 when used in an Dynaco ST70 (normally uses a 5AR4/GZ34)?
>
> Both are $22. the WZ68 can handle 450ma while the WZ34 can handle 225ma.
>
> Is the WZ68 simply the same pinout and rectifier, but rated for higher current?
>
> If so, then why would one buy a WZ34 when you could just buy a WZ68 and put it in the ST70?
>
> Jason
>

Jason,
You are right that the 68 is a higher current version of the 34. They are both the same pinout. The 34 has more series resistance and the output voltage will start to "sag" sooner than the 68 (this is what many guitar players want). You can use either one even though the amp was designed with a 34 in mind. Probably the only time you may notice a difference is running your amp at high volumes and/or with a high amount of bass.
Regards,
Gene
Technician
Weber Speakers
3111 East St.
Kokomo, Indiana USA 46902

I just wanted to thank you for posting this message about this and I hope it helps some of the others on the board as much as its helped me. Thanks!!!