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?
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.
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