6v 5AR4?

[pftrvlr]

Is there any 6v rectifier tube can allow 250ma?

Thanks,

 

[Fuling]

6AU4GTA damped diodes should do, but you will need two of them as they are single diodes.

 

[pftrvlr]

Hmm, the spec say 175ma:

http://tdsl.duncanamps.com/show.php?des=6AU4GTA

 

[Colt45]

175 x 2

 

[Bandersnatch]

hey-Hey!!!,
There are also the big 9-pin types, 6DN3 for one. A pair of those could supply a half an amp( that's short for Ampere, not part of an amplifier ). It will drop only 14V at 350 mA of plate current, so you could build a 700 mA PS with a pair of these...
cheers,
Douglas

 

[dhaen]

Another benefit of TV damper diodes is their extremely high heater to cathode insulation (normally a ceramic sleeve). This means you can use a near-earth 6.3 volt source, though I wouldn't mix it with any small-signal stage heaters.

 

[pftrvlr]

I also find out 6DM4A and 6DA4A have the similar spec.

Anyone has experiences with 6DM4A? They appear to be more expensive than 6AU4.

 

[ray_moth]

Svetlana's 6D22S TV damper diodes seem pretty good. They tolerate up to 600v heater-cathode, making them versatile. These are in current production.

The only downsides are that they are single diodes, they use a top cap for the cathode and they use the 9-pin magnoval socket, which is octal-size but can be hard to find.