Re: [Amateur-repairs] Company Needed to test 4CX1000a Tubes

You amp is probably the best test bed for your valves?

KR

Andrew 

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On January 2, 2026, at 14:25, David Mitchell via groups.io <wb2pjh=gmail.com@groups.io> wrote:

I'm trying to finish the repairs on my Alpha 8410 and would like to know if there is a company that has the proper fixture to test the two Penta 4CX10000a tubes?  I checked for obvious shorts between the grids, cathode and plates and they all look OK.  There aren't many repair facilities around that service amps that use these tubes.

 

73,

Dave WB2PJH