Question about a hybrid PSU design

[reaction]

Hello,

Just found this schematic:

http://www.diyparadiso.com/othello1.htm

Does anybody know what are the benefits of using an EZ80 tube rectifier just after the silicone bridge?

 

[Yugo]

Hello,

Just found this schematic:

http://www.diyparadiso.com/othello1.htm

Does anybody know what are the benefits of using an EZ80 tube rectifier just after the silicone bridge?

Reaction,
The IDH rectifier as is EZ 80/81 will provide slow start for the B+ which could not be provided with SS diodes.In other words, without that rctf. the signal tubes will suffer from cathode stripping,because B+ will be applied before they get warmed!

Regards,
Yugovitz

 

[Sch3mat1c]

Of course, cathode stripping is that fairy tale they tell tube-geek kids at night to scare them...

Tube or SS. Make up your mind. Use a timer relay if you have to (e.g. transmitter tubes specified for a heatup period).

Also no need for *******' 1mF on a preamp

Tim