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Old 15th May 2014, 10:59 am   #1
ukcol
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Join Date: May 2003
Location: Harlaxton, Lincolnshire, UK.
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Default CV1326 = AC4/Pen ???

Is a CV1326 an EXACT replacement for the AC4/Pen?

In some notes Mike Barker wrote on the Murphy A40C he said,

Quote:-

"Oh, do make sure you have AC4/Pen output valves, Nothing else will do! No, not even those Nasty Mullard PenB4's. If you want the quality you must have the Mazda AC4/Pen's".

End quote.

Although the AC4/Pen valves in my A40C are still serviceable, one of them is only just in the "green zone" when testing emission, which means they are out of balance at the very least.

Langrex had four NOS AC4/pen valves listed in stock and so I ordered 2 yesterday. They arrived today but turned out to be CV1326s.

The National Valve museum lists NEAR equivalents to the CV1326 as AC4/Pen, ARP8, PenB4, CV3526, Pen428 and APR4E.
They also list NEAR equivalents for the AC4/Pen as ARP8 and CV1326.

Frank's Electron Tube Data site lists AC4Pen and ARP8 as near equivalents to the CV1326.

My Bernard Babani Equivalents book lists the AC4/Pen as equivalent to the CV1326 in the CV section, the AC4/Pen is not listed in the commercial valve list.

In view of Mike's comments above I am concerned to find out whether or not the CV1326 is a direct replacement for the AC4/Pen. If not I will return the CV1326s to Langrex and try to source a pair of genuine Mazda AC4/Pen valves.

I am hoping that the CV1326 is a Mazda AC4/Pen made for the military.

Last edited by ukcol; 15th May 2014 at 11:10 am.
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