Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: currly30 on May 17, 2023, 08:10:54 PM

Title: 6J5 to 6C45P?
Post by: currly30 on May 17, 2023, 08:10:54 PM
Would I be able to use the 6J5 tubes with an adapter in place of the 6C45P?
Title: Re: 6J5 to 6C45P?
Post by: Paul Birkeland on May 17, 2023, 08:39:08 PM
Most definitely not a good idea!
Title: Re: 6J5 to 6C45P?
Post by: currly30 on May 17, 2023, 09:43:22 PM
Why is that? Doesn't it have the same voltage and current?
Title: Re: 6J5 to 6C45P?
Post by: Doc B. on May 18, 2023, 04:17:21 AM
Very different tube with much less gain, much less max plate dissipation  and much higher output impedance. The most feasible substitute for a 6C45pi is a WE437A. IME the 6C45pi sounds just as good as the 437A and even a bit better in some applications.
Title: Re: 6J5 to 6C45P?
Post by: Paul Birkeland on May 18, 2023, 04:37:51 AM
You'd also be running at nearly maximum cathode current, which would also likely shorten the lifetime of a 6J5.
Title: Re: 6J5 to 6C45P?
Post by: currly30 on May 18, 2023, 10:56:23 AM
Interesting. Thank you for the information.
Title: Re: 6J5 to 6C45P?
Post by: bergurbrag on July 17, 2023, 06:00:55 AM
Hi ! Are there any upgrade tubes for the Mainline you would recomend, that would upgrade the sound ?
Title: Re: 6J5 to 6C45P?
Post by: Doc B. on July 17, 2023, 06:09:57 AM
The most feasible substitute for a 6C45pi is a WE437A. Of course this requires completely different sockets and the tubes are very expensive. IME the 6C45pi sounds just as good as the 437A and even a bit better in some applications.

IMO the energy would be better spent upgrading headphones or maybe playing with boutique capacitors.
Title: Re: 6J5 to 6C45P?
Post by: ipetruk on August 23, 2023, 10:36:27 PM
Also 6S15p, I tried it. Sounds different, a matter of taste