4P1L DHT Line Stage

[merlin el mago]

Michael what B+ do you use: 250VDC and 70mA?

 

[michaelvv]

Michael what B+ do you use: 250VDC and 70mA?

I'm using the gyrator v2 so my B+ is not that critical.

I'm running my 4P1L on 30mA each which I believe is sufficient.

So 70mA seems to be a fair amount of current for a set.

Don't know what is preferable for transformer output, as I am using
a Cap output version.

 

[michaelvv]

Hi Merlin el Mago.

If you decide to do the ver3 , with transformer output listening to
Andy and use this link for Ales ver3 as posted earlier.

I have no clue about ver3 , never build it.

Michael

 

[merlin el mago]

Well, that's a start. That's the PSU for the Gen 3 version, 235v. The schematic you posted was closer to the Gen 1b 250v.

http://www.bartola.co.uk/valves/wp-content/uploads/2015/02/4P1L-Siberian-Gen1b-v01.png

Still 70mA?

?

 

[beardman]

Hello merlin
the 70ma is the value you set Salas hv in..(Ale wrote 75ma)

the 2 tube use about 60ma

with my new gyro i have about 240vdc to the gyrator..and about 155vdc to the anode

best bjarne

 

[merlin el mago]

Thanks bjarne, what schematic are you using?

 

[beardman]

same as Michael use
only difference,,i have 15ohm resistor for heater..he use 8ohm

i have also used the gen3 trafo output--

 

[merlin el mago]

This one?

 

[beardman]

yes

 

[merlin el mago]

Do you use SSHV2?

 

[beardman]

no..not in my gyro pre...but i use it in my trafo pre

i use only filmcaps to the highvolt

 

[merlin el mago]

Thank you your information is much appreciated & helped me a lot, I want to try first like you without SSHV2 only gyrator + CCS load so I design my PSU for 65mA to be in the safe side and 250V for B+.

 

[beardman]

will you use trafo or gyrator---and 8ohm or 15 ohm for heater

 

[merlin el mago]

15 ohms for heater like you, what trafo are you using volts & va?

 

[beardman]

I use a trafo with 3 output..170-180-190 vac---can not remember the va..

use now the 190vac

 

[merlin el mago]

I'm sorry trafo for heater?

 

[beardman]

good question --only thing i know for now is..i have 20vdc after the rectifire and caps..

it falls some volt down with the Coleman regulator.

 

[merlin el mago]

20vdc not loaded, right?

 

[beardman]

yes..

 

[merlin el mago]

Thank you, do you remember how much power rating?