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Old 5th June 2004, 01:50 PM   #1
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Default 5v Damper Diode?

Did they make 5 volt Damper diodes back in the good ole days? I would like to try a couple in the PSU for my linestage.
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Old 5th June 2004, 05:15 PM   #2
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Default Rare as hens teeth

(As they say your side of the pond )


I can't imagine an application for one, so I'm sure nobody made any.
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Old 5th June 2004, 06:22 PM   #3
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I mean a damper diode like a 6au4 with a 5 volt filament.
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Old 5th June 2004, 06:49 PM   #4
DougL is offline DougL  United States
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The application note for the 6D22S indicates it will run on 5 or 6.3 volts.

Tech Note for 6D22S

I got 6 receintly on e-bay for under $5 ea. otherwise hard to find.

Enjoy;

Doug
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Old 5th June 2004, 08:24 PM   #5
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Hi,

Since you I assume you have 5V AC and this is for a linsestage, why use a FWB rectifier?
You'll have about 7V DC. Add a dropping resistor to arrive at 6.3V and you can use small dampers such as the 6S2/EY86s?

Cheers,
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Old 6th June 2004, 01:36 AM   #6
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Actually I was thinking of using a couple of tube damper diodes to make the bipolar PSU for my buffered linestage. They are supposed to be much quieter than anything else in power supply rectification. I didn't want to run the diodes off of the heater winding so as to avoid any interaction between the tube heaters and the PSU rectification. That may sound a little silly but that is how I'm looking at it. Are my concerns unfounded?
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Old 6th June 2004, 03:17 AM   #7
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G,

Use a Chinese 5AR4 for the tube half of your hybrid bridge. The forward voltage drop in a 5AR4 is not much greater than that in dampers, particularly at low preamp currents. UF4007s will take care of the SS half of the bridge nicely.
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Old 6th June 2004, 12:08 PM   #8
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If it's only a line amp where the current drain is not too high, 5 volts might well be enough for a 6v3 heater anyway.
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Old 6th June 2004, 07:56 PM   #9
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somwhat OT; but anyone care to reccomend a damper diode that has good sound, and likely to be somewhat available in NOS from both UK and USA manufacturers?

(No duodecar bases, but 'strange' filament voltages and top-caps are ok. Oh, a slow warm-up would naturally be good too. )
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Old 6th June 2004, 09:24 PM   #10
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Majestic,

The 6AU4 is a very safe bet in damper diodes. Damper diodes turn on very slowly; a 5AR4 is faster. SED currently offers the 6D22S; it uses a tiny cathode cap and a Magnoval socket.

You can get a feel for what's available by searching AES' (www.tubesandmore.com) web site for "damper".
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