looking for a jennings 10-250PF veritable capacitor 55kv

[tunercars]

looks like this

 

[nomadradio]

55 KV?

There's a glass one at Surplus Sales of Nebraska.

https://www.surplussales.com/VaccumVarCaps/VVC5.html

About halfway down the page, his stock # CVV-VMMHC-250-55.

2100 bucks. Down a bit and to the right is a ceramic 55KV cap, but max capacitance is 450pf. 2300 bucks.

No cheap options at this level of performance.

73

 

[BJ radionut]

Variable Vacuum Capacitors Product Category - Max-Gain Systems

Click to visit the Variable Vacuum Capacitors Products of Max-Gain Systems's Shop. Any products marked "In Stock" ship within 1 business day of paid order!

mgs4u.com

That voltage level is the killer (55KV)! WOW...the picture supplied looks much smaller...maybe 5-10KV... GL

 

[Shockwave]

Since amplifiers that can produce a carrier of 500 KW only operate with 16 KV on the anode, what in the world was the original application for this capacitor?

 

[Captain Kilowatt]

Since amplifiers that can produce a carrier of 500 KW only operate with 16 KV on the anode, what in the world was the original application for this capacitor?

RF voltages need to be much higher than the normal applied plate voltage. We used to run 1 Kw AM transmitters with 2600 volts on the anode. RF voltage at the 50 ohm common point was around 225 volts however the rating of the tune capacitor in the transmitter itself as well as in the ATU was around 10,000 volts due to the reactance voltages present. Anode blocking caps were anything between 10,000 and 25,000 volts.

 

[linearone]

looks like this View attachment 69472

Mgs4u should be able to sort u out

 

[nomadradio]

Good suggestion. Didn't think to give Allen a try. He's the real McCoy. Used to see him at the Hamvention flea market, but he stays closer to home these days.

Just checked his site. More vacuum caps in one place that I'm used to.

73

 

[linearone]

Paging @Crusher

 

[Shockwave]

RF voltages need to be much higher than the normal applied plate voltage. We used to run 1 Kw AM transmitters with 2600 volts on the anode. RF voltage at the 50 ohm common point was around 225 volts however the rating of the tune capacitor in the transmitter itself as well as in the ATU was around 10,000 volts due to the reactance voltages present. Anode blocking caps were anything between 10,000 and 25,000 volts.

I understand that, that's why I figured this baby is for the largest tubes ever made. Unless there is another application I'm overlooking.

 

[tunercars]

55 KV?

There's a glass one at Surplus Sales of Nebraska.

https://www.surplussales.com/VaccumVarCaps/VVC5.html

About halfway down the page, his stock # CVV-VMMHC-250-55.

2100 bucks. Down a bit and to the right is a ceramic 55KV cap, but max capacitance is 450pf. 2300 bucks.

No cheap options at this level of performance.

73

thanks ill have a look