Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: ipetruk on November 01, 2021, 01:09:45 AM

Title: One of the best 12AU7 for my Crack came as a stock power regulator for Mainline
Post by: ipetruk on November 01, 2021, 01:09:45 AM

Very interesting, I've just got my Mainline kit (yay), so I have an interesting journey head.

I could not hold myself to try stock 12AU7 on my Crack+Speedball. Wow, I've plugged it in and it was immediately on-par with my rare Brimar, Mullard, RCA black and Telefunken 12AU7.

No way it is going to be a power regulator for Mainline. The tube there does not matter there and I may as well put my stock Crack 12AU7, which was a relatively mediocre Sylvania.

Can you pls help me identify this tube, so I know what it is? My current theory that is is Westinghouse 12AU7, I think I've seen a similar stamp on some tubes on Ebay. In addition there is either "W" or "M" on the metal at the bottom of the tube.

Title: Re: One of the best 12AU7 for my Crack came as a stock power regulator for Mainline
Post by: Paul Birkeland on November 01, 2021, 03:19:55 AM

That's an RCA.

https://www.ebay.com/itm/184538444532?hash=item2af75932f4:g:nl0AAOSwvZ5fsiol (https://www.ebay.com/itm/184538444532?hash=item2af75932f4:g:nl0AAOSwvZ5fsiol)

Title: Re: One of the best 12AU7 for my Crack came as a stock power regulator for Mainline
Post by: ipetruk on November 01, 2021, 06:44:39 AM

Thank you! I already have an RCA Black Plate, this one is similar and I really like it