tubes
I have a rca smoke glass 6sn7 or a hytron I will send you and a 6as7g for the back.They are tested and have no problem with the Darkvoice a.c. heaters.(dead quiet) I have read now a lot about tube amps and using a.c. is what most all manufactures use and it can be a hum issue in all amps and tubes.... Its not just the darkvoice.
Run a search on hum pots,a.c. heaters, d.c. heaters.
I have done some changes to mine so I have some unused tubes that sound good but I no longer use.
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