Which Antek transforms to use

[colin.hepburn2]

Hi All

Using Antek transforms
Sorry beginner’s question
Using Antek transforms on UK 240 volts in
Which one to use for single ended Hi Fi 6SL7/KT66 I want minimum of 400volts on anode of KT66 after losses about 10 volts across 5k output Transformer

kt66 anode to cathode about 31v psu is using 6D22s damper diodes tubes capacitor input I have been looking at the AS-4T360volts 360-0-360v 0r the AN-4T400 400-0-400v but not sure which is best option for total 150/170 mA at idle

Thank for you help
Antek - AS-4T360
Antek - AN-4T400

 

[DeathRex]

I'm liking the 360, because you can use single 500V power supply caps. With the AN-4T400 you'll need to use series capacitors. With a good power supply you'll be able to get 450VDC from the 360. The damper diodes I've tried had very little loss. I couldn't find much on the 4D22.

 

[tomchr]

If you're using a tube rectifier, check the datasheet for the tube to figure out which secondary voltage to use for a given output voltage. At least for the 5AR4's I've played with, the actual output voltage came very close to the value predicted by the curves in the datasheet.

~Tom

 

[colin.hepburn2]

I will be using damper diodes’ 6D22S so voltage drop across each one is 9 volt total loss something
Like 360 X 1.414 = 509 volts
Total loses 509 - 31 -10 - 9 = 459v
Looking to get 400v B+ on Kt66 Anode not to be confused with the psu HT voltage
So KT66 cathode 31v/560R=55mA
does this look about right
thanks for you help

 

[DeathRex]

Datasheets don't mention first filter capacitor size for damper diodes. If you're running the diode at nearly 100%, it's probably safest to use a very small 4uf or so filter capacitor, and measure the anode dissipation. The 6D22 has a large anode dissipation at 11 watts. Looks like you're going to be at about 25% of the diode's rating, so you might be good up to 22 or 33uf. I bet you're gonna have very little drop across those dampers. They will be very happy and last a long time.

 

[colin.hepburn2]

Thanks
Yep some others are using up to 47uf with the 6D22S with no problems as does this link http://www.tube-town.net/info/sed-technotes/docs/technoteNo52.html note figure 2 near the bottom of page