diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Tubes / Valves (http://www.diyaudio.com/forums/tubes-valves/)
-   -   Regulated Power Supply using 6550 (http://www.diyaudio.com/forums/tubes-valves/226619-regulated-power-supply-using-6550-a.html)

denny9167 29th December 2012 03:11 PM

Regulated Power Supply using 6550
 
1 Attachment(s)
I found a schematic the other day for a regulated power supply,and I made some changes,replaced an EL34 used for the feedthrough with a 6550,and replaced the the high voltage silicon transistor with a 12AT7 tube used for part of the error correction amp. Wanted to know if posted schematic needs any other changes. I can post original if needed. Original schematic gives an output from 60 to 400VDC at 150mA.

denny9167 29th December 2012 03:35 PM

1 Attachment(s)
Here's the original

freax 29th December 2012 04:20 PM

Impressive!

Ketje 29th December 2012 04:23 PM

You shoud'nt put the heaters on the same transfo winding.Check the max.permissable voltage between heater and cathode !
Mona

jane 29th December 2012 04:42 PM

Quote:

Originally Posted by denny9167 (Post 3303089)
Wanted to know if posted schematic needs any other changes.

V1 should be negative biased. With R13 in mid pos the bias voltage will be about 1/2 B+ in this setup..

denny9167 29th December 2012 07:24 PM

Quote:

Originally Posted by freax (Post 3303176)
Impressive!

Thanks

denny9167 29th December 2012 07:26 PM

Quote:

Originally Posted by Ketje (Post 3303180)
You shoud'nt put the heaters on the same transfo winding.Check the max.permissable voltage between heater and cathode !
Mona

I'm elevating the heaters on V1, and V2, do I need to use separate windings for V2?

Kay Pirinha 29th December 2012 10:10 PM

I can't see any kind of regulation, neither in your hollow state, nor in the original solid state (from Elektor, I suppose?) version. There is no reference the output voltage would be compared with. It's just an adjustable voltage supply.

Best regards!

Ketje 30th December 2012 01:22 PM

In the original schematic there is a -70V reference.The way you try to do it here the outputvoltage will never go up(V1 keeps conducting).
With the 75k and 300k resistances the heater is between 300V and 350V above ground.For one part of V1 that's ok but the other has the cathode at 0V.Data of the 12AT7 :Vfk=90V max! You can't use a dubble triode here.
The powertubes (6550 or EL34) is limited to 100V ,so yes every tube a winding of it's own
Mona
.

denny9167 30th December 2012 02:08 PM

Quote:

Originally Posted by Ketje (Post 3304241)
In the original schematic there is a -70V reference.The way you try to do it here the outputvoltage will never go up(V1 keeps conducting).
With the 75k and 300k resistances the heater is between 300V and 350V above ground.For one part of V1 that's ok but the other has the cathode at 0V.Data of the 12AT7 :Vfk=90V max! You can't use a dubble triode here.
The powertubes (6550 or EL34) is limited to 100V ,so yes every tube a winding of it's own
Mona
.

So I should probably stick with the transistor,and only use half of the 12AT7,and use separate windings? I won't need to worry about lifting my heaters either?


All times are GMT. The time now is 10:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2