Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.

make 2 pairs of caps in series and parallel them

:Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.

:make 2 pairs of caps in series and parallel them
:
::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.

::make 2 pairs of caps in series and parallel them
::
:::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it. Oops, pressed "submit" by accident. So sorry. You might want to put 47k resistors across the caps to balance the Voltage.
Lewis (now I'll click "submit" again.

:Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.

Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.

The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?

Unless you have another problem your replacement power transformer is ok in my view.
Bill

::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.
:
:Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.
:
:The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?
:
:Unless you have another problem your replacement power transformer is ok in my view.
:Bill
:Thanks Bill. I'm a little rusty and older than when I worked as a tech. The DC voltage @ Rect Cathode on the 6T2 IS 340 with no ckt load except for a 10uf and now series/parallel caps w/supposedly 900 V limit (I could not readily find a 500V cap). The B+ supply after the field coil with full power up is 315VDC. The radio worked for a while but on another power-up popped my 1Amp fuse on the 115VAC line input. I believe that the 5V4 rect is shot. Rather than that replacement is there a reliable twin solid state diode and series resistor combination that would not either result in risk to the first 10uf cap with the faster conduction,or raise the B+ supply voltage after the field coil too high? I calculated a 470 ohm res to sub for the rect tube's internal resistance, and I might use two 250ma switching diodes that I have, or use better.

:::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.
::
::Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.
::
::The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?
::
::Unless you have another problem your replacement power transformer is ok in my view.
::Bill
::Thanks Bill. I'm a little rusty and older than when I worked as a tech. The DC voltage @ Rect Cathode on the 6T2 IS 340 with no ckt load except for a 10uf and now series/parallel caps w/supposedly 900 V limit (I could not readily find a 500V cap). The B+ supply after the field coil with full power up is 315VDC. The radio worked for a while but on another power-up popped my 1Amp fuse on the 115VAC line input. I believe that the 5V4 rect is shot. Rather than that replacement is there a reliable twin solid state diode and series resistor combination that would not either result in risk to the first 10uf cap with the faster conduction,or raise the B+ supply voltage after the field coil too high? I calculated a 470 ohm res to sub for the rect tube's internal resistance, and I might use two 250ma switching diodes that I have, or use better.

Ray, 340 VDC on pin 8 of rectifier sounds good to me. But 315 VDC after the field coil? Not good. Check resistance of the field coil. Low resistance means much higher output voltage. So you should measure the voltage on the plate and screen grid of the 6F6 too. Test your 5V4. I don't believe a solid state replacement will take care of your problem. I would stay with a tube. You can buy solid state replacements off Ebay and other places.
Bill

::::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.
:::
:::Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.
:::
:::The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?
:::
:::Unless you have another problem your replacement power transformer is ok in my view.
:::Bill
:::Thanks Bill. I'm a little rusty and older than when I worked as a tech. The DC voltage @ Rect Cathode on the 6T2 IS 340 with no ckt load except for a 10uf and now series/parallel caps w/supposedly 900 V limit (I could not readily find a 500V cap). The B+ supply after the field coil with full power up is 315VDC. The radio worked for a while but on another power-up popped my 1Amp fuse on the 115VAC line input. I believe that the 5V4 rect is shot. Rather than that replacement is there a reliable twin solid state diode and series resistor combination that would not either result in risk to the first 10uf cap with the faster conduction,or raise the B+ supply voltage after the field coil too high? I calculated a 470 ohm res to sub for the rect tube's internal resistance, and I might use two 250ma switching diodes that I have, or use better.
:
:Ray, 340 VDC on pin 8 of rectifier sounds good to me. But 315 VDC after the field coil? Not good. Check resistance of the field coil. Low resistance means much higher output voltage. So you should measure the voltage on the plate and screen grid of the 6F6 too. Test your 5V4. I don't believe a solid state replacement will take care of your problem. I would stay with a tube. You can buy solid state replacements off Ebay and other places.
:Bill, Until I'm sur that I'm not going to destroy another 5V4, I'm going on previous advice here and use two solid state diodes, a 500 ohm res, and another 15K res to limit charging current to the first 10 uf cap on the rect cathode w/out that tube in place. The first test, that 10uf cap had +128VDC. On the second test, I removed the field coil/spkr connector (field coil measures 1370 ohms), and the 1A fuse blew before I could take new V measurements. Why do you suppose- Hummmm!

:::::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.
::::
::::Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.
::::
::::The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?
::::
::::Unless you have another problem your replacement power transformer is ok in my view.
::::Bill
::::Thanks Bill. I'm a little rusty and older than when I worked as a tech. The DC voltage @ Rect Cathode on the 6T2 IS 340 with no ckt load except for a 10uf and now series/parallel caps w/supposedly 900 V limit (I could not readily find a 500V cap). The B+ supply after the field coil with full power up is 315VDC. The radio worked for a while but on another power-up popped my 1Amp fuse on the 115VAC line input. I believe that the 5V4 rect is shot. Rather than that replacement is there a reliable twin solid state diode and series resistor combination that would not either result in risk to the first 10uf cap with the faster conduction,or raise the B+ supply voltage after the field coil too high? I calculated a 470 ohm res to sub for the rect tube's internal resistance, and I might use two 250ma switching diodes that I have, or use better.
::
::Ray, 340 VDC on pin 8 of rectifier sounds good to me. But 315 VDC after the field coil? Not good. Check resistance of the field coil. Low resistance means much higher output voltage. So you should measure the voltage on the plate and screen grid of the 6F6 too. Test your 5V4. I don't believe a solid state replacement will take care of your problem. I would stay with a tube. You can buy solid state replacements off Ebay and other places.
::Bill, Until I'm sur that I'm not going to destroy another 5V4, I'm going on previous advice here and use two solid state diodes, a 500 ohm res, and another 15K res to limit charging current to the first 10 uf cap on the rect cathode w/out that tube in place. The first test, that 10uf cap had +128VDC. On the second test, I removed the field coil/spkr connector (field coil measures 1370 ohms), and the 1A fuse blew before I could take new V measurements. Why do you suppose- Hummmm!

Proceed as you wish Ray. I'm not getting you anywhere. By-the-way you don't disconnect the field coil from the circuit to take voltage reading. You are fortunate in that you had a fuse.
Bill

::::::Does anyone know if I can use four 10uf 450V electrolytics to get 10 uf 900v (500V min)? I want a higher voltage rating in case the field coil ever opens. The 6T2 Plays again but having to use a 650VAC CT Xfmr instead of a 630 CT, At Rect cathode,I get more than 10VDC extra than expected 325V it's 340V with circuit loads, and over 450V Unloaded with 10uf on it.
:::::
:::::Ray, Since I said a 650 CT would be ok I need just to be a little clearer on your voltage readings. Voltage reading on the cathode is DC not AC from the power transformer secondary.
:::::
:::::The schematic readings of 315 VAC on the plates of the rectifier tube will be higher, how much? The 340 Volts DC reading on the cathode of the rectifier will be slightly higher, how much? The 245 Volts DC on the 6F6 plate will be slightly higher, how much?
:::::
:::::Unless you have another problem your replacement power transformer is ok in my view.
:::::Bill
:::::Thanks Bill. I'm a little rusty and older than when I worked as a tech. The DC voltage @ Rect Cathode on the 6T2 IS 340 with no ckt load except for a 10uf and now series/parallel caps w/supposedly 900 V limit (I could not readily find a 500V cap). The B+ supply after the field coil with full power up is 315VDC. The radio worked for a while but on another power-up popped my 1Amp fuse on the 115VAC line input. I believe that the 5V4 rect is shot. Rather than that replacement is there a reliable twin solid state diode and series resistor combination that would not either result in risk to the first 10uf cap with the faster conduction,or raise the B+ supply voltage after the field coil too high? I calculated a 470 ohm res to sub for the rect tube's internal resistance, and I might use two 250ma switching diodes that I have, or use better.
:::
:::Ray, 340 VDC on pin 8 of rectifier sounds good to me. But 315 VDC after the field coil? Not good. Check resistance of the field coil. Low resistance means much higher output voltage. So you should measure the voltage on the plate and screen grid of the 6F6 too. Test your 5V4. I don't believe a solid state replacement will take care of your problem. I would stay with a tube. You can buy solid state replacements off Ebay and other places.
:::Bill, Until I'm sur that I'm not going to destroy another 5V4, I'm going on previous advice here and use two solid state diodes, a 500 ohm res, and another 15K res to limit charging current to the first 10 uf cap on the rect cathode w/out that tube in place. The first test, that 10uf cap had +128VDC. On the second test, I removed the field coil/spkr connector (field coil measures 1370 ohms), and the 1A fuse blew before I could take new V measurements. Why do you suppose- Hummmm!
:
:Proceed as you wish Ray. I'm not getting you anywhere. By-the-way you don't disconnect the field coil from the circuit to take voltage reading. You are fortunate in that you had a fuse.
:Bill, Thanks for trying to help. The first 10uf (4 series/parallel 450V 10uf s)should have combined 900VDC rating, and the 2000 V PIV 250ma 20A surge diodes still check good. That previous voltage measurement was only to check cap charged voltage @ low current. I'll let you know when the 6T2 works again and what I find. This is a great forum-lotsa good help and polite folks.