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Old 8th February 2008, 06:52 AM   #1
pftrvlr is offline pftrvlr  United States
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Default 6v 5AR4?

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

Thanks,
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Old 8th February 2008, 07:08 AM   #2
Fuling is offline Fuling  Sweden
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6AU4GTA damped diodes should do, but you will need two of them as they are single diodes.
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Old 8th February 2008, 07:13 AM   #3
pftrvlr is offline pftrvlr  United States
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Hmm, the spec say 175ma:

http://tdsl.duncanamps.com/show.php?des=6AU4GTA
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Old 8th February 2008, 08:56 AM   #4
Colt45 is offline Colt45  Serbia
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175 x 2
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Old 8th February 2008, 12:00 PM   #5
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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
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Old 8th February 2008, 03:01 PM   #6
dhaen is offline dhaen  Europe
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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.
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Old 8th February 2008, 08:40 PM   #7
pftrvlr is offline pftrvlr  United States
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I also find out 6DM4A and 6DA4A have the similar spec.

Anyone has experiences with 6DM4A? They appear to be more expensive than 6AU4.
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Old 9th February 2008, 01:32 AM   #8
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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.
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