Suitable substitute for AC064 - UK Vintage Radio Repair and Restoration Discussion Forum

lloydwells · 13th Nov 2019, 10:29 am

Does anyone have any idea what a suitable and more importantly available substitute would be for this valve information on it seems impossible to find other than Mullard produced it and a company called 66 did an almost equivalent .

PJL · 13th Nov 2019, 10:47 am

I have a 1929 set with one of these and it works but is slightly low emissions. A few years later and pentodes were the craze.
I would try any of the 4V 1A pentodes wired in triode mode, AC/PEN, MPT4, MKT4...

FERNSEH · 13th Nov 2019, 11:44 am

Info from the Mullard Maintainence Manual.

DFWB.

mister valve · 16th Nov 2019, 12:55 am

If you can get one, an "AC044" or a "PX4" would substitute but you would need to alter the negative grid bias voltage, as they are not a direct equivalent to the AC064.

13th Nov 2019, 10:29 am	#1
lloydwells Heptode Join Date: Aug 2016 Location: Dumfries, Scotland, UK. Posts: 549	Suitable substitute for AC064 Does anyone have any idea what a suitable and more importantly available substitute would be for this valve information on it seems impossible to find other than Mullard produced it and a company called 66 did an almost equivalent .

13th Nov 2019, 10:47 am	#2
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Suitable substitute for AC064 I have a 1929 set with one of these and it works but is slightly low emissions. A few years later and pentodes were the craze. I would try any of the 4V 1A pentodes wired in triode mode, AC/PEN, MPT4, MKT4...

13th Nov 2019, 11:44 am	#3
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Suitable substitute for AC064 Info from the Mullard Maintainence Manual. DFWB. Attached Thumbnails

16th Nov 2019, 12:55 am	#4
mister valve Hexode Join Date: Aug 2009 Location: Blackpool, Lancashire, UK. Posts: 311	Re: Suitable substitute for AC064 If you can get one, an "AC044" or a "PX4" would substitute but you would need to alter the negative grid bias voltage, as they are not a direct equivalent to the AC064. __________________ If you live, the chassis was dead; if you're dead, the chassis was live !!!!