[Amps] series directly heated cathode out to 4 tubes

[R.Measures]

>Hello, 
>
>A friend in a foreign land has Emailed me 
>to say his home brew four 572b amplifier 
>filament transformer failed. 
>
>He's been able to locate a same size 
>~25.5 volt CT transformer and would like 
>to use it. 
>
>The Kenwood TL-922 has a series 
>connection heater, the drive divided from 
>the tuned input with coupling caps. 
>
>I'd like to read any or your opinions about 
>trying to drive 4 directly heated cathodes 
>(572b) connected in series? 

**  Why not go for it?  A 922 has no detectable hum, so it just might 
fly, Skipp.