Genuine Cossor 42MP/Pen - UK Vintage Radio Repair and Restoration Discussion Forum

Catkins · 11th Jul 2023, 7:14 pm

Does anyone have a genuine (i.e. Cossor made) 42MP/PEN they want to sell?

The Marconi/OSRAM N41 and KT41, MAZDA AC2/PEN, and Mullard PenA4 are equivalents, but, I have those already.

I'm curious to see the difference between the Cossor version and above, and I'd like to make an all Cossor line-up in a radio I'm restoring.

I've seen two badged Cossor 42MP/PENs but which are clearly Mullard PenA4s in disguise, e.g.

A Cossor 42MP/PEN http://www.vintageradio.nl/buizen/42mp-pen.htm

A Mullard PenA4 http://www.r-type.org/exhib/aad0144.htm

I believe a genuine 42MP/Pen should be more bulbuous like the MAZA AC2/PEN http://www.r-type.org/exhib/aba0003.htm

and R-type has some AC2/PENs which are clearly a Marconi KT41 http://www.r-type.org/exhib/aaq0052.htm

The fact being post-war it was very common to badge other company equivalents.

11th Jul 2023, 7:14 pm	#1
Catkins Pentode Join Date: Feb 2015 Location: Chepstow, Monmouthshire, UK. Posts: 235	Genuine Cossor 42MP/Pen Does anyone have a genuine (i.e. Cossor made) 42MP/PEN they want to sell? The Marconi/OSRAM N41 and KT41, MAZDA AC2/PEN, and Mullard PenA4 are equivalents, but, I have those already. I'm curious to see the difference between the Cossor version and above, and I'd like to make an all Cossor line-up in a radio I'm restoring. I've seen two badged Cossor 42MP/PENs but which are clearly Mullard PenA4s in disguise, e.g. A Cossor 42MP/PEN http://www.vintageradio.nl/buizen/42mp-pen.htm A Mullard PenA4 http://www.r-type.org/exhib/aad0144.htm I believe a genuine 42MP/Pen should be more bulbuous like the MAZA AC2/PEN http://www.r-type.org/exhib/aba0003.htm and R-type has some AC2/PENs which are clearly a Marconi KT41 http://www.r-type.org/exhib/aaq0052.htm The fact being post-war it was very common to badge other company equivalents.