PM2 Valve - UK Vintage Radio Repair and Restoration Discussion Forum

Laurence Smith · 2nd Aug 2025, 1:02 pm

I'm after a PM2 (Mullard) or 220P (Cossor) battery triode, as the existing 220P in my KB Brandeset IIIA has turned out to have a short circuit between grid and heater.

Thanks

martiR2R · 2nd Aug 2025, 4:14 pm

According to my spreadsheet ? I have 2 PM2's and a 220P - I'm on my hols at the moment, remind me next weekend if you get no joy elsewhere.

Martin

Laurence Smith · 2nd Aug 2025, 7:36 pm

Quote:

Originally Posted by martiR2R

According to my spreadsheet ? I have 2 PM2's and a 220P - I'm on my hols at the moment, remind me next weekend if you get no joy elsewhere.

Martin

Thanks very much Martin - will do.

Laurence Smith · 18th Aug 2025, 8:54 pm

It turned out that Martin didn't have a PM2 or 220P as they'd been disposed of previously, so I'm still on the lookout if anyone has one of these.

Thanks

AC/HL · 19th Aug 2025, 7:24 pm

I've found a PM2 in what FJC used to call `the spares box`
No shorts, filament continuity and a vacuum, but otherwise untested. Yours for the postage (RM small parcel via PayPal) PM your address and an email for the tracking if you want it.

Laurence Smith · 19th Aug 2025, 7:44 pm

Thanks very much AC/HL, a PM is on its way.

Laurence Smith · 27th Aug 2025, 8:15 pm

This thread can now be closed, as I have obtained a working PM2.

Many thanks

2nd Aug 2025, 1:02 pm	#1
Laurence Smith Pentode Join Date: Mar 2021 Location: Bicester, Oxon & North Cornwall, UK Posts: 143	PM2 Valve I'm after a PM2 (Mullard) or 220P (Cossor) battery triode, as the existing 220P in my KB Brandeset IIIA has turned out to have a short circuit between grid and heater. Thanks __________________ Laurence BVWS Member

2nd Aug 2025, 4:14 pm	#2
martiR2R Heptode Join Date: Aug 2012 Location: Preston, Lancashire, UK. Posts: 556	Re: PM2 Valve According to my spreadsheet ? I have 2 PM2's and a 220P - I'm on my hols at the moment, remind me next weekend if you get no joy elsewhere. Martin __________________ BVWS Member (lapsed!) Thinking outside the box is always a journey of discovery.

18th Aug 2025, 8:54 pm	#4
Laurence Smith Pentode Join Date: Mar 2021 Location: Bicester, Oxon & North Cornwall, UK Posts: 143	Re: PM2 Valve It turned out that Martin didn't have a PM2 or 220P as they'd been disposed of previously, so I'm still on the lookout if anyone has one of these. Thanks __________________ Laurence BVWS Member

19th Aug 2025, 7:24 pm	#5
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,646	Re: PM2 Valve I've found a PM2 in what FJC used to call `the spares box` No shorts, filament continuity and a vacuum, but otherwise untested. Yours for the postage (RM small parcel via PayPal) PM your address and an email for the tracking if you want it.

19th Aug 2025, 7:44 pm	#6
Laurence Smith Pentode Join Date: Mar 2021 Location: Bicester, Oxon & North Cornwall, UK Posts: 143	Re: PM2 Valve Thanks very much AC/HL, a PM is on its way. __________________ Laurence BVWS Member

27th Aug 2025, 8:15 pm	#7
Laurence Smith Pentode Join Date: Mar 2021 Location: Bicester, Oxon & North Cornwall, UK Posts: 143	Re: PM2 Valve This thread can now be closed, as I have obtained a working PM2. Many thanks __________________ Laurence BVWS Member