IO Anti-Parasitic Adaptor for VCM's - UK Vintage Radio Repair and Restoration Discussion Forum

David Simpson · 3rd Sep 2018, 5:55 pm

A chum just recently needed an anti-parasitic adaptor for his CT160. For EL34's & such. An IO NOS Valve Holder, an IO Valvebase from a duff valve, and another old valvebase from a duff B9 valve. Ferrite beads sourced from eBay. The B9 base was cut to make a skirt to hold the IO items, and araldited together. Internal leads & beads heat-shrink sleeved. All connections meggered at 1000V. Worked fine on my Mk3, with one of his EL34's drawing nigh-on 90mA. (His other 3 EL34's were also graphed & produced "matched pair" results on the whole slope up to 80mA ).

Regards, David

Diabolical Artificer · 4th Sep 2018, 6:44 am

Nice job David.

Andy.

3rd Sep 2018, 5:55 pm	#1
David Simpson Nonode Join Date: Mar 2008 Location: Aberdeen, UK. Posts: 2,852	IO Anti-Parasitic Adaptor for VCM's A chum just recently needed an anti-parasitic adaptor for his CT160. For EL34's & such. An IO NOS Valve Holder, an IO Valvebase from a duff valve, and another old valvebase from a duff B9 valve. Ferrite beads sourced from eBay. The B9 base was cut to make a skirt to hold the IO items, and araldited together. Internal leads & beads heat-shrink sleeved. All connections meggered at 1000V. Worked fine on my Mk3, with one of his EL34's drawing nigh-on 90mA. (His other 3 EL34's were also graphed & produced "matched pair" results on the whole slope up to 80mA ). Regards, David Attached Thumbnails

4th Sep 2018, 6:44 am	#2
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,658	Re: IO Anti-Parasitic Adaptor for VCM's Nice job David. Andy. __________________ Curiosity hasn't killed this cat...so far.