Experimental Power Supply SPICE ...

pweaudiotech

Member
2008-02-11 6:30 pm
I've been attempting to modify the Duncan Amp Velocette Power Transformer SPICE to obtain a HV (310VCT), Heater Filament (12.6VCT) and Recitifer (5V) set of Secondaries for a SPICE Project...here is what I have come up with so far...

*
*Power Transformer w/3 Secondaries
*
.SUBCKT XFRMR3SEC 1 2 3 4 5 6 7 8 9 10
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 200.24H
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 200.24H
*
* Secondary (12.6VCT)
*
Lsec126a 6 23 331mH
Rsec126a 23 7 0.15
Rsec126b 7 25 0.15
Lsec126b 25 8 331mH
*
* Secondary (5V)
*
Lsec5 9 29 208mH
Rsec5 29 10 2.6
Kcoup Lpri1 Lsec5 Lsec310a Lsec310b Lsec126a Lsec126b 1.0
.ENDS

If anyone can give assistance it would greatly appreciated!
 

pweaudiotech

Member
2008-02-11 6:30 pm
modification...

*
*Power Transformer w/3 Secondaries (Modified)
*
.SUBCKT XFRMR3SEC 1 2 3 4 5 6 7 8 9
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 200.24H
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 200.24H
*
* Secondary (12.6V)
*
Lsec126 6 23 331mH
Rsec126 23 7 0.15
*
* Secondary (5V)
*
Lsec5 8 28 208mH
Rsec5 28 9 2.6
Kcoup Lpri1 Lsec5 Lsec310a Lsec310b Lsec126 1.0
.ENDS


This is a modified version with a 12.6V (Heater Element) Secondary (not Center Tapped). If you notice there is no longer a Pin 10. I've been looking at various Amp Schematics...most use a simple 6.3V (Heater Element) Secondary and simply connect any 12.6V Type Tube Heater Elements (such as a 12AX7A with Dual Triode) in a Parallel manner (e.g. Pins 4 and 5 are connected to one side of the Secondary and Pin 9 is connected to the other side of it). This allows the use of a 6.3V Transformer Winding for both 6.3V and 12.6V Tubes (e.g. 6V6GTA and 12AX7A). So...I need to change as follows: Secondary (6.3V) and name of Lsec126 and Rsec126 to Lsec63 and Lsec63 and reduce the Inductance from 331mH to produce 6.3V. That I can do easily. I still need assistance in making certain the Formula is a correct one and that the Resistance (R) Values in all instances are correctly adjusted. Once done, this particular Transformer can be considered a Universal Generic Type for use with just about any 6 and 12 Series Tubes. The only variation then necessary would be that of the Mains HV (310VCT) per Plate Voltage of the Power Tube as required. Amperage of all Secondaries being also taken into consideration. Anyone have any ideas???
 

pweaudiotech

Member
2008-02-11 6:30 pm
mod...

*
*Power Transformer w/3 Secondaries (Modified)
*
.SUBCKT XFRMR3MOD 1 2 3 4 5 6 7 8 9
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 200.24H
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 200.24H
*
* Secondary (6.3V)
*
Lsec63 6 23 331mH
Rsec63 23 7 0.15
*
* Secondary (5V)
*
Lsec5 8 28 208mH
Rsec5 28 9 2.6
Kcoup Lpri1 Lsec310a Lsec310b Lsec63 Lsec5 1.0
.ENDS


P.S. No need to change the 6.3V Inductance...removal of the CT Section of the Formula produced a Single 6.3V Secondary Winding! Hope this is useful to those DIY Experimenters in the Transformer World! P.S. renamed the SUBCKT .CIR File to XFRMR3MOD.
 

pweaudiotech

Member
2008-02-11 6:30 pm
*
*Power Transformer w/3 Secondaries (Modified)
*
.SUBCKT XFRMR3MOD 1 2 3 4 5 6 7 8 9
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 800.95
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 800.95
*
* Secondary (6.3V)
*
Lsec63 6 23 331mH
Rsec63 23 7 0.15
*
* Secondary (5V)
*
Lsec5 8 28 208mH
Rsec5 28 9 2.6
Kcoup Lpri1 Lsec310a Lsec310b Lsec63 Lsec5 1.0
.ENDS


This is a corrected SPICE Model to show proper 310VCT Secondary...Inductance increase of Lsec310a and Lsec310b by aprox. X4 multiplication factor...
 

pweaudiotech

Member
2008-02-11 6:30 pm
revision...

Post #4
*
*Power Transformer w/3 Secondaries (Modified)
*
.SUBCKT XFRMR3SEC 1 2 3 4 5 6 7 8 9
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 800.96
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 800.96
*
* Secondary (6.3V)
*
Lsec63 6 23 331mH
Rsec63 23 7 0.15
*
* Secondary (5V)
*
Lsec5 8 28 208mH
Rsec5 28 9 2.6
Kcoup Lpri1 Lsec310a Lsec310b Lsec631.0
.ENDS


Another revised version of this same SPICE Model...notice the slight increase in the 310VCT Secondary Inducantce Leakage Factor...
 

pweaudiotech

Member
2008-02-11 6:30 pm
deleted entry restored...

*
*Power Transformer w/3 Secondaries (Modified)
*
.SUBCKT XFRMR3SEC 1 2 3 4 5 6 7 8 9
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 800.96
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 800.96
*
* Secondary (6.3V)
*
Lsec63 6 23 331mH
Rsec63 23 7 0.15
*
* Secondary (5V)
*
Lsec5 8 28 208mH
Rsec5 28 9 2.6
Kcoup Lpri1 Lsec310a Lsec310b Lsec63 Lsec5 1.0
.ENDS



Replaced...missing 5V entry...below is this same SPICE Model without the 5V Secondary...Notice the deleted SPICE Elements to achieve same...


*
*Power Transformer w/2 Secondaries (Modified)
*
.SUBCKT XFRMR2SEC 1 2 3 4 5 6 7
*
* Primary (120V)
*
Lleak1 1 20 10mH
Lpri1 20 21 120H
Rpri1 21 2 13.0
*
* Secondary (310VCT)
*
Lsec310a 3 23 800.96
Rsec310a 23 4 75.5
Rsec310b 4 23 75.5
Lsec310b 23 5 800.96
*
* Secondary (6.3V)
*
Lsec63 6 23 331mH
Rsec63 23 7 0.15
Kcoup Lpri1 Lsec310a Lsec310b Lsec63 1.0
.ENDS