ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: danhei FYI: After setting the values in t... -- 6/21/2000 3:52 AM

Re: Adding Mid Control to sb12?

6/21/2000 4:31 AM
Casey4s	Re: Adding Mid Control to sb12? The schematic is available right here in the Ampage Schematic files, it is listed as having the 6L6 power. Parts are available all over the internet everything is common stuff. The hardest thing to find might be filter caps, I used multi section can types because I had 2 in my "stuff". I also had to put four 30uf @350v in series parallel to obtain the 30uf @ 600v needed for the first one. The Power Transformer is a 375-0-375 with 5v and 6.3v heater taps. Hamond makes one to fit the bill Part nr 274BX (175ma). This is higher than needed for a 6L6 amp, you could also use a 273BX rated 350-0-350(175ma). For out put any good PP 6L6 type rated at 8 ohms out at 40+ watts will work. Transformers always seem to be the single most expensive componet in an amp project. I also added a bias adjustment pot to my circuit to facilitate different tubes. Casey4s

6/21/2000 4:31 AM

Casey4s

Re: Adding Mid Control to sb12?

The schematic is available right here in the Ampage Schematic files, it is listed as having the 6L6 power.

Parts are available all over the internet everything is common stuff. The hardest thing to find might be filter caps, I used multi section can types because I had 2 in my "stuff". I also had to put four 30uf @350v in series parallel to obtain the 30uf @ 600v needed for the first one.

The Power Transformer is a 375-0-375 with 5v and 6.3v heater taps. Hamond makes one to fit the bill Part nr 274BX (175ma). This is higher than needed for a 6L6 amp, you could also use a 273BX rated 350-0-350(175ma).
For out put any good PP 6L6 type rated at 8 ohms out at 40+ watts will work. Transformers always seem to be the single most expensive componet in an amp project.

I also added a bias adjustment pot to my circuit to facilitate different tubes.

Casey4s

Replies:

Peter Michaux Transformer selection? -- 6/21/2000 5:21 AM