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Old 25th July 2011, 05:19 PM   #1
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Default Which tube Rectifier is good enough for 5902 tube amp ?

Hi, I'm trying to remake the PSU using tube rectifier for this tiny amp
Kolibri

Which tube is small but enough to make the psu ?
I'm thinking 6x4 but is is there any smaller rec. Tube than this ?

It's only DC 125


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Old 25th July 2011, 09:44 PM   #2
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6X4 looks pretty good for this if you're not going Si for the power supply. The forward voltage doesn't seem to be excessive.
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Old 25th July 2011, 10:02 PM   #3
kevinh is offline kevinh  United States
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Lynn Olson likes the 6D22S TV Damper Diode. He talks about the performance of different Diodes here: http://nutshellhifi.com/triode1.html
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Old 26th July 2011, 02:37 PM   #4
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So .. Therebis no rect tube smaller than 6X4 ?
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Old 26th July 2011, 04:12 PM   #5
kevinkr is offline kevinkr  United States
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Nothing that I am aware of really other than the types used in tube tektronix scopes intended for very low current HV rectification for CRTs.

If compactness is the issue then UF4007 diodes are probably a good compromise otherwise the 6X4 would seem to fit the bill.. Another option could be to diode strap something like the 6021 dual triode, keeping in mind that its performance as a rectifier might not be the best, and its peak current rating would probably be miniscule - you'd have to characterize its behavior in such service, and it would be hard to guess how long it would last in such an application.

One other thought might be the 6AL5, again watch out for its ratings! (Dual diode good for a few mA at 100V or so)
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Old 27th July 2011, 01:54 AM   #6
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A look at the 5902 data sheet indicates that upwards of 60 mA. of B+ will be needed by 2X SE "finals". The 6X4 is rated for 70 mA. You might not have enough left to energize the small signal circuitry. IMO, you need a rectifier with bigger "cojones" than the 6X4 has. The smallest physical package that fills the requirement is the 6V4/EZ80. The Loctal based 7Z4 is physically bigger than the 6V4, but it's inexpensive and will allow for a 100 mA. B+ draw.

Cathode stripping is a complete non-issue at this low a B+ value. Schottky diodes are as quiet as vacuum diodes and that seems to be the best choice to me.
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Old 27th July 2011, 04:59 AM   #7
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thanks guys,

Eli, how about this Schematic ?
HeadWize - Project Addendum: A Single-Ended OTL Amplifier for Dynamic Headphones by Aren van Waarde

how is the best way to get a lower Output to DC125 ?

this should do the job to power that amp ?

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Old 28th July 2011, 05:05 AM   #8
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oh well,
I guess I have to find bigger current than 6X4.

any Idea ? bigger "cojones" but phisically small as possible.


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Old 28th July 2011, 02:39 PM   #9
kevinkr is offline kevinkr  United States
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You could use a pair of 6X4, or a single 6V4 (9 pin)..
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Old 28th July 2011, 04:43 PM   #10
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You mean dual 6x4/EZ90 like this schematic ?
Btw I can use EZ90 right?

HeadWize - Project Addendum: A Single-Ended OTL Amplifier for Dynamic Headphones by Aren van Waarde
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