Bottlehead Kits > S.E.X. Kit

C4S voltages

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Happy Ghost:
Hello!

I had built my S3X 3.0 + C4S during the Covid days. The left tube always had a faint hiss. So I finally replaced the tube with one I brought separately. I re-measured the voltages afterwards. OA is still good ~ 69 V, OB is now higher ~ 86 V. While both are still in range, I wonder if I should put in a matched pair of tubes instead? The amp still works and sounds great (no hiss though!) .. But OB being close to the edge is a tad worrying.. Is it a problem?

Rgds,
Atul

Paul Joppa:
It's not a problem - the circuit is very flexible about that particular voltage. Plus, there's a good chance it will come down after a few weeks of use, if the tube has been unused for a few decades.

Happy Ghost:
Thank you so much Paul!

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