Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: DanP on March 17, 2013, 06:36:51 AM

Title: Strange Sighting
Post by: DanP on March 17, 2013, 06:36:51 AM

Well I've dipped my toe into the SET waters by purchasing an already completed, approx 5-year old SEX from another member.  First let me say that nothing this inexpensive should sound this good. And for reference, I am playing my Quicksilver Minuet Supremes (87.5dB) to comfortable levels in a small, acoustically live room (with sub). Now for my question: the RCA 6DN7 tubes that came with the amp do not appear identical to each other.  One tube has a small filament that runs just under the dome of the tube and lights up bright with power.  The other tube does not have this filament.  I looked at a set of Raytheon tubes and neither of them have this filament.  Can someone explain this?  Are these tubes OK to use as is?
Thanks.

Title: Re: Strange Sighting
Post by: Doc B. on March 17, 2013, 06:47:14 AM

Some have series heaters and some have parallel heaters. You can mix and match, no problem. They sound identical.

Title: Re: Strange Sighting
Post by: DanP on March 17, 2013, 08:23:54 AM

Thanks for the quick response.