[R-390] Tube Shields and Heat follow up

[Perry Sandeen]

Hi Gang,

Got a chance last week to verify a suspicion.  I have an "original RARE L@@K Collins R390A with
famous Collins PTO used in the one off"
.  Oops, Zap me Igor. Ah thank you. 

    Less see where wuz me.  Oh yes.  I have a Collins R390a, a Stewart Warner unit and an EAC. 
All the power supply transformers list the filament voltage as 6.1 volts.  Collins engineers
realized that there was a serious heat problem and lowered the filament voltage to extend the tube
life.

BTW, I have the edited Feb reflector list in RTF that I will email to anyone.  I also found a
zenar multiplier circuit so one could put a bridge rectifier, caps and regulator in the space
behind the power transformer and run regulated DC filaments.  Reply off list.  Regards, Perrier 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com