How many rectifiers can have mesh plates?

andyjevans · 15th February 2009, 10:32 PM

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

Colt45 · 15th February 2009, 11:03 PM

only crappy antiques, pretty much.

nhuwar · 15th February 2009, 11:19 PM

Too Hot

Tweeker · 15th February 2009, 11:31 PM

I guess you can use triodes as rectifiers, this was common practice in the twenties...

andyjevans · 15th February 2009, 11:47 PM

only crappy antiques, pretty much...>>

You do realise that these are amongst the best rectifiers in the world and fetch up to $500 each!!!

rtsang · 16th February 2009, 01:07 AM

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?

Tweeker · 16th February 2009, 01:08 AM

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.

rtsang · 16th February 2009, 01:34 AM

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.

Tweeker · 16th February 2009, 02:20 AM

If you can turn on the heaters before B+ that might help.

Colt45 · 16th February 2009, 04:28 AM

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.

15th February 2009, 10:32 PM	#1
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	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

15th February 2009, 11:31 PM	#4
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	I guess you can use triodes as rectifiers, this was common practice in the twenties... __________________ Be sure your foil hat has a good low impedance ground.

16th February 2009, 01:08 AM	#7
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	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. __________________ Be sure your foil hat has a good low impedance ground.

16th February 2009, 02:20 AM	#9
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	If you can turn on the heaters before B+ that might help. __________________ Be sure your foil hat has a good low impedance ground.

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15th February 2009, 11:03 PM	#2
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	only crappy antiques, pretty much.

15th February 2009, 11:19 PM	#3
nhuwar diyAudio Member Join Date: Jan 2007 Location: Cypress Texas	Too Hot

15th February 2009, 11:47 PM	#5
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	only crappy antiques, pretty much...>> You do realise that these are amongst the best rectifiers in the world and fetch up to $500 each!!!

16th February 2009, 01:07 AM	#6
rtsang diyAudio Member Join Date: Aug 2005	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?

16th February 2009, 01:34 AM	#8
rtsang diyAudio Member Join Date: Aug 2005	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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