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Old 15th February 2009, 10:32 PM   #1
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Default How many rectifiers can have mesh plates?

Rectifiers I know of that have mesh plates:

AZ1
AZ11
RGN1064

These I think can have mesh plates

AZ12
RGN1054
RGN2004
RGN2054
RGN4004

Any others?

Any Diodes?

Please help me sort this out!!

andy
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Old 15th February 2009, 11:03 PM   #2
Colt45 is offline Colt45  Serbia
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only crappy antiques, pretty much.
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Old 15th February 2009, 11:19 PM   #3
nhuwar is offline nhuwar  United States
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Too Hot
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Old 15th February 2009, 11:31 PM   #4
Tweeker is offline Tweeker  United States
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I guess you can use triodes as rectifiers, this was common practice in the twenties...
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Old 15th February 2009, 11:47 PM   #5
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only crappy antiques, pretty much...>>

You do realise that these are amongst the best rectifiers in the world and fetch up to $500 each!!!
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Old 16th February 2009, 01:07 AM   #6
rtsang is offline rtsang  Hong Kong
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I have seen the following having a mesh plate

UX280
RGN1054
RGN1064
RGN2004
RGN4004
AZ1

I think the AZ1 and RGN1064 are jusy the same tubes with different base.

I have not seen a RGN 2504 having a mesh plate, but there may well be a version with mesh plates.

I have to say, mesh plate rectifiers do sound good, may be is due to the better isolation from microphonics.

My problem with mesh plate diodes are spark up on switch on. Any idea what is the cause and how to tackle it?
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Old 16th February 2009, 01:08 AM   #7
Tweeker is offline Tweeker  United States
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Sophia Electric offers a mesh plate "274A"

Note, 10uF capacitor input limit, and current limit is also lower than their (and WE's) solid plate version.

This may relate to some issues with mesh plate diodes.
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Old 16th February 2009, 01:34 AM   #8
rtsang is offline rtsang  Hong Kong
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Emission labs currently makes some mesh plate 5U4B and 5Z3.

If we want to be exact, the Sophia/TJ/FM version is not a mesh plate, but peforated plate.

The old mesh plate is a piece of wire mesh, the Sophia version is a plate with holes punched on it. I am not sure if there is any difference or just marketing hype.

In my amp, the input cap is 8u, but I still get random sparking on switch on.
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Old 16th February 2009, 02:20 AM   #9
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If you can turn on the heaters before B+ that might help.
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Old 16th February 2009, 04:28 AM   #10
Colt45 is offline Colt45  Serbia
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Quote:
Originally posted by andyjevans
You do realise that these are amongst the best rectifiers in the world and fetch up to $500 each!!!
"Best" and "most expensive" aren't always mutually inclusive.

high voltage drop, low rectified current... Newer rects smoke these spec wise, especially later run dampers, and by a long shot.

When you're getting outclassed by a 5U4, something is wrong.
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