skhan007
New member
- Joined
- Feb 8, 2007
- Messages
- 1,670
I just got these and can't wait to try them in both my 1987x Marshall plexi reissue and my GDS 18 watt 1974x clone. I was wondering if any of you have any opinions on the following 12ax7's and recommendations (phase inverter position, first gain stage, tone stack, etc.).
L to R:
1. Black plate RCA dates to Sept. 1957
2. Grey plate RCA 1960 43rd week (Oct.)
3. Long plate Bogen by Mullard dates B9A, Blackburn Jan. 1959
4. Telefunken made in Germany, unknown date. On the top it has a "913" stamp
5. Zenith made in Holland (Amperex, I think), unknown date. Has "6 21" stamp
L to R:
1. Black plate RCA dates to Sept. 1957
2. Grey plate RCA 1960 43rd week (Oct.)
3. Long plate Bogen by Mullard dates B9A, Blackburn Jan. 1959
4. Telefunken made in Germany, unknown date. On the top it has a "913" stamp
5. Zenith made in Holland (Amperex, I think), unknown date. Has "6 21" stamp