[ARC5] ARC5 Digest, Vol 132, Issue 12

[Andy Young]

Hi Neil,

Yes, the Air Ministry VT-numbered series and the US VT-numbered series are completely different. The Air Ministry numbers were subsequently replaced by the CV numbering system (along with the Army and Navy numbering systems).

Just to confuse matters further, there was also a British Post Office valve numbering system starting with VT...................

I guess that 'VT' in the US series stands for 'Vacuum Tube'?

Andy
M0FYA
  ----- Original Message ----- 
  From: AKLDGUY . 
  To: Andy Young ; ARC-5 List 
  Sent: Tuesday, January 06, 2015 9:29 PM
  Subject: Re: [ARC5] ARC5 Digest, Vol 132, Issue 12


  Hi Andy


  Thank you for that. Looking at the specifications, it's obvious the tubes
  are electrically dissimilar to the VT-25s we're interested in. I think that
  settles the matter.


  73 de Neil ZL1ANM




  On Wed, Jan 7, 2015 at 10:10 AM, Andy Young <andy-young at supanet.com> wrote:

    The VT25 shown is a prewar British Air Ministry type, see http://www.r-type.org/exhib/aaj0063.htm

    VT stands for 'Valve, Transmitting', there was also a whole sequence starting VR for 'Valve, Receiving'.

    10E/7312 is the Air Ministry Stores Reference number

    The base is not an adaptor, it is an L4 base.

    Andy