[Amps] Using DC On 3-500Z filaments for mobile operation?

[R.Measures]

On Mar 3, 2005, at 1:43 PM, Japerlick at aol.com wrote:

> Actually, I can't accept EVER connecting tube filaments in series.  I 
> know it
> is done in the old 7-tube table top radios, but it is very scary in a 
> 3-500
> amp!

Henry Radio Co. and Trio-Kenwood successfully use series-connected 
3-500Z filaments.

> I would definitley recommend using a transformer that allows you to run
> the filaments in parallel rather than in series. ... ... ...

Why?

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org