Pin connections on a Mullard MW6/2 tube - UK Vintage Radio Repair and Restoration Discussion Forum

stevehertz · 30th Jan 2017, 8:02 pm

I want the pin connections for a Mullard MW6/2 tube. It's the 2.5", 25kV tube that was used in late 50s projection TVs. Specifically, I'm wanting the heater pin connections.

Anyway, the info re pin connections on this page http://www.r-type.org/exhib/aaa0291.htm vary from the Philips data on the PDF accessed from the same page. The main page says pins 2 & 5 are heaters, whereas the Philips data says pins 1 & 4. I have fired off an email to the guy at the web site, but I've not heard back from him yet. I need a definitive answer as the moment I have two choices

So if someone can speak from hard experience that would be great. Thanks.

Jac · 30th Jan 2017, 8:42 pm

Here http://www.mif.pg.gda.pl/homepages/f...30/m/MW6-2.pdf
it is clearly indicated.

Jac

stevehertz · 31st Jan 2017, 1:56 am

Thanks Jac. The link is to the same pdf as the one I mention initially, the Philips one. In all honesty, I ought to trust that one and disbelieve the National Valve museum one I suppose. I'm surprised they got it wrong mind, hence my reason for checking, ie this thread.

Jac · 31st Jan 2017, 9:11 am

Hi Steven,

Not all manufacturers count the pins in exactly the same way at the side-contact valves. That's where the problem lies.
Whay they mean might be (probably is) identical, but only a clear picture indicating the pin numbering or connections is to be trusted.

Jac

stevehertz · 31st Jan 2017, 9:16 am

Jac, agreed, but in this instance the page above does include a pin diagram - click on to it - and a table. It just appears to be wrong.

stevehertz · 1st Feb 2017, 11:55 am

I've just heard back from Allan Wyatt, and the info on the valve museum page was incorrect. The info is now corrected; both the web page and the the linked Philips data sheet pdf are now in accord.

This thread can be closed now.

30th Jan 2017, 8:02 pm	#1
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,831	Pin connections on a Mullard MW6/2 tube I want the pin connections for a Mullard MW6/2 tube. It's the 2.5", 25kV tube that was used in late 50s projection TVs. Specifically, I'm wanting the heater pin connections. Anyway, the info re pin connections on this page http://www.r-type.org/exhib/aaa0291.htm vary from the Philips data on the PDF accessed from the same page. The main page says pins 2 & 5 are heaters, whereas the Philips data says pins 1 & 4. I have fired off an email to the guy at the web site, but I've not heard back from him yet. I need a definitive answer as the moment I have two choices So if someone can speak from hard experience that would be great. Thanks. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

30th Jan 2017, 8:42 pm	#2
Jac Heptode Join Date: Jun 2006 Location: Eindhoven, Netherlands. Posts: 642	Re: Pin connections on a Mullard MW6/2 tube Here http://www.mif.pg.gda.pl/homepages/f...30/m/MW6-2.pdf it is clearly indicated. Jac

31st Jan 2017, 1:56 am	#3
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,831	Re: Pin connections on a Mullard MW6/2 tube Thanks Jac. The link is to the same pdf as the one I mention initially, the Philips one. In all honesty, I ought to trust that one and disbelieve the National Valve museum one I suppose. I'm surprised they got it wrong mind, hence my reason for checking, ie this thread. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

31st Jan 2017, 9:11 am	#4
Jac Heptode Join Date: Jun 2006 Location: Eindhoven, Netherlands. Posts: 642	Re: Pin connections on a Mullard MW6/2 tube Hi Steven, Not all manufacturers count the pins in exactly the same way at the side-contact valves. That's where the problem lies. Whay they mean might be (probably is) identical, but only a clear picture indicating the pin numbering or connections is to be trusted. Jac

31st Jan 2017, 9:16 am	#5
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,831	Re: Pin connections on a Mullard MW6/2 tube Jac, agreed, but in this instance the page above does include a pin diagram - click on to it - and a table. It just appears to be wrong. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

1st Feb 2017, 11:55 am	#6
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,831	Re: Pin connections on a Mullard MW6/2 tube I've just heard back from Allan Wyatt, and the info on the valve museum page was incorrect. The info is now corrected; both the web page and the the linked Philips data sheet pdf are now in accord. This thread can be closed now. __________________ A digital radio is the latest thing, but a vintage wireless is forever..