Gz34 rectifier with dc heater

[erez1012]

Hi
I want to build PS with the gz34 tube, I see in the typical scheme that the filament pin is shared with the output pin, I don’t have 5vac transformer, only 5vdc 5A SS power supply.

Can I use it?
thanks

http://www.r-type.org/pdfs/gz34.pdf

 

[Eli Duttman]

I say go buy a 5 VAC filament trafo. The supply that feeds the rectifier's heater is at B+ potential. I highly doubt the SS PSU has the HIPOT capability necessary for survival.

High PIV Schottky diodes are every bit as quiet as vacuum rectifiers. Look to them in your situation.

 

[rayma]

Hi
I want to build PS with the gz34 tube, I see in the typical scheme that the filament pin is shared with the output pin, I don’t have 5vac transformer, only 5vdc 5A SS power supply.

Can I use it?
thanks

http://www.r-type.org/pdfs/gz34.pdf

The filament must be tied to the cathode, and be elevated in voltage by that amount.
The 5VDC supply may not have that isolation capability, and could be dangerous if it failed.
Please use a transformer instead.

 

[petertub]

Hi
I want to build PS with the gz34 tube, I see in the typical scheme that the filament pin is shared with the output pin, I don’t have 5vac transformer, only 5vdc 5A SS power supply.

Can I use it?
thanks

http://www.r-type.org/pdfs/gz34.pdf

No.
You would need a 5V transformer that is isolated for 500V DC

But you can use a GZ34-emulator, 2 1n4007 diodes and 50ohm resistor.

 

[erez1012]

thanks for the answers
just buy 5v transformer.

i don't understand way it connected together, furthermore, now i have 5v ripple in the first cap?

i have another 6ZY5G tube, here the heater is separate PIN, maybe its easier to use.
thanks

 

[petertub]

thanks for the answers
just buy 5v transformer.

i don't understand way it connected together, furthermore, now i have 5v ripple in the first cap?

i have another 6ZY5G tube, here the heater is separate PIN, maybe its easier to use.
thanks

The reason filament and catode is connected is that the isolation between them is difficult to guarantee for 500V . It' small distances and only
some al-oxide that separates them.

No you won't have a 5V ripple since the filament is floating.
But if you don't have a isolated 5V winding i would recommend the
solid-state alternative. 2 x 1n4007 and a 50ohm 5w resistor.

 

[erez1012]

The reason filament and catode is connected is that the isolation between them is difficult to guarantee for 500V . It' small distances and only
some al-oxide that separates them.

thanks

No you won't have a 5V ripple since the filament is floating.

thanks

But if you don't have a isolated 5V winding

i have regular 6vac transformer not isolated, i want to try unwinding and get 5v, do i really need isolated? its only 240vac in the input.

2 x 1n4007 and a 50ohm 5w resistor

now i have diode bridge, just for fun i want to move to tube rectifier

thanks

 

[SY]

You understand that the 5V of "ripple" is floating on like 400V of "ripple"?

 

[erez1012]

yess
thanks