[Amps] 3-500ZG brands

[R.Measures]

On Aug 11, 2004, at 7:04 PM, Clay W7CE wrote:

> I've just acquired a Kenwood TL-922A which needs a new pair of finals 
> (one
> of the filaments doesn't light up).

Clay -- Please mail me the tube with the open filament.  I will repair 
it if possible, or, if not, autopsy it and post the picture of the guts 
on my Web site.

> Does anyone have experience using the
> Taylor or RF Parts branded 3-500ZG tubes in this amp?  Does the 
> cathode bias
> need to be changed when switching to the 3-500ZG?

Not if the ZSAC is 75mA to 90mA per tube.  However, the stock 7.5v ( 
zener in the 922) will usually be too much bias V.  -- i. e., not 
produce enough ZSAC.
-  end

> Any recommendations will
> be appreciated.
>
> Thanks,
> Clay  W7CE
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org